There is something that's not clear in what you are describing. Gluster doesn't come into play until you access your data through the gulsterfs mount. You can even stop your gluster volume and stop the glusterfs daemon to confirm that it is not really interfering with your writes to the brick in any way. What you are describing sounds like an issue with the way you have partitioned your drive or set up the filesystem, which is probably xfs in case of glusterfs if you are using defaults. Are you comparing the same file system in both your cases ? On Fri, Apr 10, 2015 at 11:45 AM, Punit Dambiwal <hypunit at gmail.com> wrote:> Hi Ben, > > That means if i will not attach the SSD in to brick...even not install > glusterfs on the server...it gives me throughput about 300mb/s but once i > will install glusterfs and add this ssd in to glusterfs volume it gives me > 16 mb/s... > > On Fri, Apr 10, 2015 at 9:32 PM, Ben Turner <bturner at redhat.com> wrote: > >> ----- Original Message ----- >> > From: "Punit Dambiwal" <hypunit at gmail.com> >> > To: "Ben Turner" <bturner at redhat.com> >> > Cc: "Vijay Bellur" <vbellur at redhat.com>, gluster-users at gluster.org >> > Sent: Thursday, April 9, 2015 9:36:59 PM >> > Subject: Re: [Gluster-users] Glusterfs performance tweaks >> > >> > Hi Ben, >> > >> > But without glusterfs if i run the same command with dsync on the same >> > ssd...it gives me good throughput...all setup (CPU,RAM,Network are same) >> > the only difference is no glusterfs... >> > >> > [root at cpu09 mnt]# dd if=/dev/zero of=test bs=64k count=4k oflag=dsync >> > 4096+0 records in >> > 4096+0 records out >> > 268435456 bytes (268 MB) copied, 0.935646 s, 287 MB/s >> > [root at cpu09 mnt]# >> > >> > [image: Inline image 1] >> > >> > But on the top of the glusterfs it gives too slow performance....i run >> the >> > ssd trim every night to clean the garbage collection...i think there is >> > something need to do from gluster or OS side to improve the >> > performance....otherwise no use to use the ALL SSD with gluster because >> > with all SSD you will get the performance slower then SATA.... >> > >> > >> > >> > On Fri, Apr 10, 2015 at 2:12 AM, Ben Turner <bturner at redhat.com> wrote: >> > >> > > ----- Original Message ----- >> > > > From: "Punit Dambiwal" <hypunit at gmail.com> >> > > > To: "Vijay Bellur" <vbellur at redhat.com> >> > > > Cc: gluster-users at gluster.org >> > > > Sent: Wednesday, April 8, 2015 9:55:38 PM >> > > > Subject: Re: [Gluster-users] Glusterfs performance tweaks >> > > > >> > > > Hi Vijay, >> > > > >> > > > If i run the same command directly on the brick... >> >> What does this mean then? Running directly on the brick to me means >> running directly on the SSD. The command below is the same thing as above, >> what changed? >> >> -b >> >> > > > >> > > > [root at cpu01 1]# dd if=/dev/zero of=test bs=64k count=4k oflag=dsync >> > > > 4096+0 records in >> > > > 4096+0 records out >> > > > 268435456 bytes (268 MB) copied, 16.8022 s, 16.0 MB/s >> > > > [root at cpu01 1]# pwd >> > > > /bricks/1 >> > > > [root at cpu01 1]# >> > > > >> > > >> > > This is your problem. Gluster is only as fast as its slowest piece, >> and >> > > here your storage is the bottleneck. Being that you get 16 MB to the >> brick >> > > and 12 to gluster that works out to about 25% overhead which is what I >> > > would expect with a single thread, single brick, single client >> scenario. >> > > This may have something to do with the way SSDs write? On my SSD at >> my >> > > desk I only get 11.4 MB / sec when I run that DD command: >> > > >> > > # dd if=/dev/zero of=test bs=64k count=4k oflag=dsync >> > > 4096+0 records in >> > > 4096+0 records out >> > > 268435456 bytes (268 MB) copied, 23.065 s, 11.4 MB/s >> > > >> > > My thought is that maybe using dsync is forcing the SSD to clean the >> data >> > > or something else before writing to it: >> > > >> > > http://www.blog.solidstatediskshop.com/2012/how-does-an-ssd-write/ >> > > >> > > Do your drives support fstrim? It may be worth it to trim before you >> run >> > > and see what results you get. Other than tuning the SSD / OS to >> perform >> > > better on the back end there isn't much we can do from the gluster >> > > perspective on that specific DD w/ the dsync flag. >> > > >> > > -b >> > > >> > > > >> > > > On Wed, Apr 8, 2015 at 6:44 PM, Vijay Bellur < vbellur at redhat.com > >> > > wrote: >> > > > >> > > > >> > > > >> > > > On 04/08/2015 02:57 PM, Punit Dambiwal wrote: >> > > > >> > > > >> > > > >> > > > Hi, >> > > > >> > > > I am getting very slow throughput in the glusterfs (dead slow...even >> > > > SATA is better) ... i am using all SSD in my environment..... >> > > > >> > > > I have the following setup :- >> > > > A. 4* host machine with Centos 7(Glusterfs 3.6.2 | Distributed >> > > > Replicated | replica=2) >> > > > B. Each server has 24 SSD as bricks?(Without HW Raid | JBOD) >> > > > C. Each server has 2 Additional ssd for OS? >> > > > D. Network 2*10G with bonding?(2*E5 CPU and 64GB RAM) >> > > > >> > > > Note :- Performance/Throughput slower then Normal SATA 7200 >> RPM?even i >> > > > am using all SSD in my ENV.. >> > > > >> > > > Gluster Volume options :- >> > > > >> > > > +++++++++++++++ >> > > > Options Reconfigured: >> > > > performance.nfs.write-behind- window-size: 1024MB >> > > > performance.io-thread-count: 32 >> > > > performance.cache-size: 1024MB >> > > > cluster.quorum-type: auto >> > > > cluster.server-quorum-type: server >> > > > diagnostics.count-fop-hits: on >> > > > diagnostics.latency- measurement: on >> > > > nfs.disable: on >> > > > user.cifs: enable >> > > > auth.allow: * >> > > > performance.quick-read: off >> > > > performance.read-ahead: off >> > > > performance.io-cache: off >> > > > performance.stat-prefetch: off >> > > > cluster.eager-lock: enable >> > > > network.remote-dio: enable >> > > > storage.owner-uid: 36 >> > > > storage.owner-gid: 36 >> > > > server.allow-insecure: on >> > > > network.ping-timeout: 0 >> > > > diagnostics.brick-log-level: INFO >> > > > +++++++++++++++++++ >> > > > >> > > > Test with SATA and Glusterfs SSD?. >> > > > ??????? >> > > > Dell EQL (SATA disk 7200 RPM) >> > > > ?- >> > > > [root at mirror ~]# >> > > > 4096+0 records in >> > > > 4096+0 records out >> > > > 268435456 bytes (268 MB) copied, 20.7763 s, 12.9 MB/s >> > > > [root at mirror ~]# dd if=/dev/zero of=test bs=64k count=4k >> oflag=dsync >> > > > 4096+0 records in >> > > > 4096+0 records out >> > > > 268435456 bytes (268 MB) copied, 23.5947 s, 11.4 MB/s >> > > > >> > > > GlsuterFS SSD >> > > > ? >> > > > [root at sv-VPN1 ~]# dd if=/dev/zero of=test bs=64k count=4k >> oflag=dsync >> > > > 4096+0 records in >> > > > 4096+0 records out >> > > > 268435456 bytes (268 MB) copied, 66.2572 s, 4.1 MB/s >> > > > [root at sv-VPN1 ~]# dd if=/dev/zero of=test bs=64k count=4k >> oflag=dsync >> > > > 4096+0 records in >> > > > 4096+0 records out >> > > > 268435456 bytes (268 MB) copied, 62.6922 s, 4.3 MB/s >> > > > ???????? >> > > > >> > > > Please let me know what i should do to improve the performance of my >> > > > glusterfs? >> > > > >> > > > >> > > > What is the throughput that you get when you run these commands on >> the >> > > disks >> > > > directly without gluster in the picture? >> > > > >> > > > By running dd with dsync you are ensuring that there is no buffering >> > > anywhere >> > > > in the stack and that is the reason why low throughput is being >> observed. >> > > > >> > > > -Vijay >> > > > >> > > > -Vijay >> > > > >> > > > >> > > > >> > > > _______________________________________________ >> > > > Gluster-users mailing list >> > > > Gluster-users at gluster.org >> > > > http://www.gluster.org/mailman/listinfo/gluster-users >> > > >> > >> > > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://www.gluster.org/mailman/listinfo/gluster-users >-------------- next part -------------- An HTML attachment was scrubbed... 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I have a similar behaviour. All systems are identical This is my setup: ############################################################ root at store-1:~# uname -a Linux store-1 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt7-1 (2015-03-01) x86_64 GNU/Linux root at store-1:~# glusterfsd --version glusterfs 3.6.2 built on Jan 21 2015 14:23:41 Repository revision: git://git.gluster.com/glusterfs.git Copyright (c) 2006-2013 Red Hat, Inc. <http://www.redhat.com/> GlusterFS comes with ABSOLUTELY NO WARRANTY. It is licensed to you under your choice of the GNU Lesser General Public License, version 3 or any later version (LGPLv3 or later), or the GNU General Public License, version 2 (GPLv2), in all cases as published by the Free Software Foundation. root at store-1:~# gluster peer status Number of Peers: 3 Hostname: 172.16.155.23 Uuid: 094c8ec4-f472-4d32-b3cb-705458cca949 State: Peer in Cluster (Connected) Hostname: 172.16.155.22 Uuid: 00042351-cc66-4528-ac66-75ed7ea01b44 State: Peer in Cluster (Connected) Hostname: 172.16.155.24 Uuid: 113307a5-79c8-47c3-a6fa-8b725a56f807 State: Peer in Cluster (Connected) root at store-1:~# gluster volume info Volume Name: cinder-disperse Type: Disperse Volume ID: a70cf0c4-9320-4e7a-8e6b-a9b6242d151e Status: Started Number of Bricks: 1 x (3 + 1) = 4 Transport-type: tcp Bricks: Brick1: 172.16.155.21:/data/cidi Brick2: 172.16.155.22:/data/cidi Brick3: 172.16.155.23:/data/cidi Brick4: 172.16.155.24:/data/cidi Options Reconfigured: storage.owner-gid: 114 storage.owner-uid: 108 performance.cache-size: 24576MB performance.io-thread-count: 64 cluster.data-self-heal-algorithm: full cluster.server-quorum-type: none cluster.quorum-type: none network.remote-dio: disable cluster.eager-lock: enable performance.stat-prefetch: off performance.io-cache: off performance.read-ahead: off performance.quick-read: off server.allow-insecure: on root at store-1:~# iperf -c 172.16.155.22 ------------------------------------------------------------ Client connecting to 172.16.155.22, TCP port 5001 TCP window size: 85.0 KByte (default) ------------------------------------------------------------ [ 3] local 172.16.155.21 port 46843 connected with 172.16.155.22 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 7.92 GBytes 6.80 Gbits/sec root at store-1:~# iperf -c 172.16.155.23 ------------------------------------------------------------ Client connecting to 172.16.155.23, TCP port 5001 TCP window size: 85.0 KByte (default) ------------------------------------------------------------ [ 3] local 172.16.155.21 port 59368 connected with 172.16.155.23 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 7.94 GBytes 6.82 Gbits/sec root at store-1:~# iperf -c 172.16.155.24 ------------------------------------------------------------ Client connecting to 172.16.155.24, TCP port 5001 TCP window size: 85.0 KByte (default) ------------------------------------------------------------ [ 3] local 172.16.155.21 port 33656 connected with 172.16.155.24 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 7.94 GBytes 6.82 Gbits/sec root at store-1:~# root at store-1:~# time sh -c "dd if=/dev/zero of=/data/cidi/test.tmp bs=4k count=2000000 && sync" 2000000+0 record dentro 2000000+0 record fuori 8192000000 byte (8,2 GB) copiati, 8,58092 s, 955 MB/s real 0m20.749s user 0m0.276s sys 0m6.304s root at store-1:/data# ############################################################ root at store-2:~# time sh -c "dd if=/dev/zero of=/data/cidi/test.tmp bs=4k count=2000000 && sync" 2000000+0 record dentro 2000000+0 record fuori 8192000000 byte (8,2 GB) copiati, 9,60108 s, 853 MB/s real 0m20.751s user 0m0.264s sys 0m6.128s ############################################################ root at store-3:~# time sh -c "dd if=/dev/zero of=/data/cidi/test.tmp bs=4k count=2000000 && sync" 2000000+0 record dentro 2000000+0 record fuori 8192000000 byte (8,2 GB) copiati, 9,27243 s, 883 MB/s real 0m20.979s user 0m0.284s sys 0m6.168s ############################################################ root at store-4:~# time sh -c "dd if=/dev/zero of=/data/cidi/test.tmp bs=4k count=2000000 && sync" 2000000+0 record dentro 2000000+0 record fuori 8192000000 byte (8,2 GB) copiati, 9,12428 s, 898 MB/s real 0m20.067s user 0m0.244s sys 0m6.304s ############################################################ I try to mount from another node ############################################################ root at nodo-3:~# iperf -c 172.16.155.21 ------------------------------------------------------------ Client connecting to 172.16.155.21, TCP port 5001 TCP window size: 85.0 KByte (default) ------------------------------------------------------------ [ 3] local 172.16.155.13 port 59299 connected with 172.16.155.21 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 7.08 GBytes 6.08 Gbits/sec root at nodo-3:~# mount -t glusterfs 172.16.155.21:/cinder-disperse /mnt/cinder-disperse root at nodo-3:~# time sh -c "dd if=/dev/zero of=/mnt/cinder-disperse/test.tmp bs=4k count=2000000 && sync" 2000000+0 record dentro 2000000+0 record fuori 8192000000 byte (8,2 GB) copiati, 72,6074 s, 113 MB/s real 1m13.842s user 0m0.584s sys 0m19.868s root at nodo-3:~# ############################################################ Is this the write speed that I can expect ? Can I improve it in some way ? Thanks a lot. M. 2015-04-11 6:19 GMT+02:00 Prasun Gera <prasun.gera at gmail.com>:> There is something that's not clear in what you are describing. Gluster > doesn't come into play until you access your data through the gulsterfs > mount. You can even stop your gluster volume and stop the glusterfs daemon > to confirm that it is not really interfering with your writes to the brick > in any way. What you are describing sounds like an issue with the way you > have partitioned your drive or set up the filesystem, which is probably xfs > in case of glusterfs if you are using defaults. Are you comparing the same > file system in both your cases ? > > On Fri, Apr 10, 2015 at 11:45 AM, Punit Dambiwal <hypunit at gmail.com> > wrote: > >> Hi Ben, >> >> That means if i will not attach the SSD in to brick...even not install >> glusterfs on the server...it gives me throughput about 300mb/s but once i >> will install glusterfs and add this ssd in to glusterfs volume it gives me >> 16 mb/s... >> >> On Fri, Apr 10, 2015 at 9:32 PM, Ben Turner <bturner at redhat.com> wrote: >> >>> ----- Original Message ----- >>> > From: "Punit Dambiwal" <hypunit at gmail.com> >>> > To: "Ben Turner" <bturner at redhat.com> >>> > Cc: "Vijay Bellur" <vbellur at redhat.com>, gluster-users at gluster.org >>> > Sent: Thursday, April 9, 2015 9:36:59 PM >>> > Subject: Re: [Gluster-users] Glusterfs performance tweaks >>> > >>> > Hi Ben, >>> > >>> > But without glusterfs if i run the same command with dsync on the same >>> > ssd...it gives me good throughput...all setup (CPU,RAM,Network are >>> same) >>> > the only difference is no glusterfs... >>> > >>> > [root at cpu09 mnt]# dd if=/dev/zero of=test bs=64k count=4k oflag=dsync >>> > 4096+0 records in >>> > 4096+0 records out >>> > 268435456 bytes (268 MB) copied, 0.935646 s, 287 MB/s >>> > [root at cpu09 mnt]# >>> > >>> > [image: Inline image 1] >>> > >>> > But on the top of the glusterfs it gives too slow performance....i run >>> the >>> > ssd trim every night to clean the garbage collection...i think there is >>> > something need to do from gluster or OS side to improve the >>> > performance....otherwise no use to use the ALL SSD with gluster because >>> > with all SSD you will get the performance slower then SATA.... >>> > >>> > >>> > >>> > On Fri, Apr 10, 2015 at 2:12 AM, Ben Turner <bturner at redhat.com> >>> wrote: >>> > >>> > > ----- Original Message ----- >>> > > > From: "Punit Dambiwal" <hypunit at gmail.com> >>> > > > To: "Vijay Bellur" <vbellur at redhat.com> >>> > > > Cc: gluster-users at gluster.org >>> > > > Sent: Wednesday, April 8, 2015 9:55:38 PM >>> > > > Subject: Re: [Gluster-users] Glusterfs performance tweaks >>> > > > >>> > > > Hi Vijay, >>> > > > >>> > > > If i run the same command directly on the brick... >>> >>> What does this mean then? Running directly on the brick to me means >>> running directly on the SSD. The command below is the same thing as above, >>> what changed? >>> >>> -b >>> >>> > > > >>> > > > [root at cpu01 1]# dd if=/dev/zero of=test bs=64k count=4k >>> oflag=dsync >>> > > > 4096+0 records in >>> > > > 4096+0 records out >>> > > > 268435456 bytes (268 MB) copied, 16.8022 s, 16.0 MB/s >>> > > > [root at cpu01 1]# pwd >>> > > > /bricks/1 >>> > > > [root at cpu01 1]# >>> > > > >>> > > >>> > > This is your problem. Gluster is only as fast as its slowest piece, >>> and >>> > > here your storage is the bottleneck. Being that you get 16 MB to >>> the brick >>> > > and 12 to gluster that works out to about 25% overhead which is what >>> I >>> > > would expect with a single thread, single brick, single client >>> scenario. >>> > > This may have something to do with the way SSDs write? On my SSD at >>> my >>> > > desk I only get 11.4 MB / sec when I run that DD command: >>> > > >>> > > # dd if=/dev/zero of=test bs=64k count=4k oflag=dsync >>> > > 4096+0 records in >>> > > 4096+0 records out >>> > > 268435456 bytes (268 MB) copied, 23.065 s, 11.4 MB/s >>> > > >>> > > My thought is that maybe using dsync is forcing the SSD to clean the >>> data >>> > > or something else before writing to it: >>> > > >>> > > http://www.blog.solidstatediskshop.com/2012/how-does-an-ssd-write/ >>> > > >>> > > Do your drives support fstrim? It may be worth it to trim before >>> you run >>> > > and see what results you get. Other than tuning the SSD / OS to >>> perform >>> > > better on the back end there isn't much we can do from the gluster >>> > > perspective on that specific DD w/ the dsync flag. >>> > > >>> > > -b >>> > > >>> > > > >>> > > > On Wed, Apr 8, 2015 at 6:44 PM, Vijay Bellur < vbellur at redhat.com >>> > >>> > > wrote: >>> > > > >>> > > > >>> > > > >>> > > > On 04/08/2015 02:57 PM, Punit Dambiwal wrote: >>> > > > >>> > > > >>> > > > >>> > > > Hi, >>> > > > >>> > > > I am getting very slow throughput in the glusterfs (dead >>> slow...even >>> > > > SATA is better) ... i am using all SSD in my environment..... >>> > > > >>> > > > I have the following setup :- >>> > > > A. 4* host machine with Centos 7(Glusterfs 3.6.2 | Distributed >>> > > > Replicated | replica=2) >>> > > > B. Each server has 24 SSD as bricks?(Without HW Raid | JBOD) >>> > > > C. Each server has 2 Additional ssd for OS? >>> > > > D. Network 2*10G with bonding?(2*E5 CPU and 64GB RAM) >>> > > > >>> > > > Note :- Performance/Throughput slower then Normal SATA 7200 >>> RPM?even i >>> > > > am using all SSD in my ENV.. >>> > > > >>> > > > Gluster Volume options :- >>> > > > >>> > > > +++++++++++++++ >>> > > > Options Reconfigured: >>> > > > performance.nfs.write-behind- window-size: 1024MB >>> > > > performance.io-thread-count: 32 >>> > > > performance.cache-size: 1024MB >>> > > > cluster.quorum-type: auto >>> > > > cluster.server-quorum-type: server >>> > > > diagnostics.count-fop-hits: on >>> > > > diagnostics.latency- measurement: on >>> > > > nfs.disable: on >>> > > > user.cifs: enable >>> > > > auth.allow: * >>> > > > performance.quick-read: off >>> > > > performance.read-ahead: off >>> > > > performance.io-cache: off >>> > > > performance.stat-prefetch: off >>> > > > cluster.eager-lock: enable >>> > > > network.remote-dio: enable >>> > > > storage.owner-uid: 36 >>> > > > storage.owner-gid: 36 >>> > > > server.allow-insecure: on >>> > > > network.ping-timeout: 0 >>> > > > diagnostics.brick-log-level: INFO >>> > > > +++++++++++++++++++ >>> > > > >>> > > > Test with SATA and Glusterfs SSD?. >>> > > > ??????? >>> > > > Dell EQL (SATA disk 7200 RPM) >>> > > > ?- >>> > > > [root at mirror ~]# >>> > > > 4096+0 records in >>> > > > 4096+0 records out >>> > > > 268435456 bytes (268 MB) copied, 20.7763 s, 12.9 MB/s >>> > > > [root at mirror ~]# dd if=/dev/zero of=test bs=64k count=4k >>> oflag=dsync >>> > > > 4096+0 records in >>> > > > 4096+0 records out >>> > > > 268435456 bytes (268 MB) copied, 23.5947 s, 11.4 MB/s >>> > > > >>> > > > GlsuterFS SSD >>> > > > ? >>> > > > [root at sv-VPN1 ~]# dd if=/dev/zero of=test bs=64k count=4k >>> oflag=dsync >>> > > > 4096+0 records in >>> > > > 4096+0 records out >>> > > > 268435456 bytes (268 MB) copied, 66.2572 s, 4.1 MB/s >>> > > > [root at sv-VPN1 ~]# dd if=/dev/zero of=test bs=64k count=4k >>> oflag=dsync >>> > > > 4096+0 records in >>> > > > 4096+0 records out >>> > > > 268435456 bytes (268 MB) copied, 62.6922 s, 4.3 MB/s >>> > > > ???????? >>> > > > >>> > > > Please let me know what i should do to improve the performance of >>> my >>> > > > glusterfs? >>> > > > >>> > > > >>> > > > What is the throughput that you get when you run these commands on >>> the >>> > > disks >>> > > > directly without gluster in the picture? >>> > > > >>> > > > By running dd with dsync you are ensuring that there is no >>> buffering >>> > > anywhere >>> > > > in the stack and that is the reason why low throughput is being >>> observed. >>> > > > >>> > > > -Vijay >>> > > > >>> > > > -Vijay >>> > > > >>> > > > >>> > > > >>> > > > _______________________________________________ >>> > > > Gluster-users mailing list >>> > > > Gluster-users at gluster.org >>> > > > http://www.gluster.org/mailman/listinfo/gluster-users >>> > > >>> > >>> >> >> >> _______________________________________________ >> Gluster-users mailing list >> Gluster-users at gluster.org >> http://www.gluster.org/mailman/listinfo/gluster-users >> > > > _______________________________________________ > Gluster-users mailing list > Gluster-users at gluster.org > http://www.gluster.org/mailman/listinfo/gluster-users >-------------- next part -------------- An HTML attachment was scrubbed... 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Hi Prasun, I partation the bricks with the following command :- mkfs.xfs -i size=512 /dev/sdb -f echo "/dev/sdb /brick1 xfs defaults 1 2" >> /etc/fstab Please suggest me if any modification required....it's SSD disk with 256GB capacity... Thanks, Punit On Sat, Apr 11, 2015 at 12:19 PM, Prasun Gera <prasun.gera at gmail.com> wrote:> There is something that's not clear in what you are describing. Gluster > doesn't come into play until you access your data through the gulsterfs > mount. You can even stop your gluster volume and stop the glusterfs daemon > to confirm that it is not really interfering with your writes to the brick > in any way. What you are describing sounds like an issue with the way you > have partitioned your drive or set up the filesystem, which is probably xfs > in case of glusterfs if you are using defaults. Are you comparing the same > file system in both your cases ? > > On Fri, Apr 10, 2015 at 11:45 AM, Punit Dambiwal <hypunit at gmail.com> > wrote: > >> Hi Ben, >> >> That means if i will not attach the SSD in to brick...even not install >> glusterfs on the server...it gives me throughput about 300mb/s but once i >> will install glusterfs and add this ssd in to glusterfs volume it gives me >> 16 mb/s... >> >> On Fri, Apr 10, 2015 at 9:32 PM, Ben Turner <bturner at redhat.com> wrote: >> >>> ----- Original Message ----- >>> > From: "Punit Dambiwal" <hypunit at gmail.com> >>> > To: "Ben Turner" <bturner at redhat.com> >>> > Cc: "Vijay Bellur" <vbellur at redhat.com>, gluster-users at gluster.org >>> > Sent: Thursday, April 9, 2015 9:36:59 PM >>> > Subject: Re: [Gluster-users] Glusterfs performance tweaks >>> > >>> > Hi Ben, >>> > >>> > But without glusterfs if i run the same command with dsync on the same >>> > ssd...it gives me good throughput...all setup (CPU,RAM,Network are >>> same) >>> > the only difference is no glusterfs... >>> > >>> > [root at cpu09 mnt]# dd if=/dev/zero of=test bs=64k count=4k oflag=dsync >>> > 4096+0 records in >>> > 4096+0 records out >>> > 268435456 bytes (268 MB) copied, 0.935646 s, 287 MB/s >>> > [root at cpu09 mnt]# >>> > >>> > [image: Inline image 1] >>> > >>> > But on the top of the glusterfs it gives too slow performance....i run >>> the >>> > ssd trim every night to clean the garbage collection...i think there is >>> > something need to do from gluster or OS side to improve the >>> > performance....otherwise no use to use the ALL SSD with gluster because >>> > with all SSD you will get the performance slower then SATA.... >>> > >>> > >>> > >>> > On Fri, Apr 10, 2015 at 2:12 AM, Ben Turner <bturner at redhat.com> >>> wrote: >>> > >>> > > ----- Original Message ----- >>> > > > From: "Punit Dambiwal" <hypunit at gmail.com> >>> > > > To: "Vijay Bellur" <vbellur at redhat.com> >>> > > > Cc: gluster-users at gluster.org >>> > > > Sent: Wednesday, April 8, 2015 9:55:38 PM >>> > > > Subject: Re: [Gluster-users] Glusterfs performance tweaks >>> > > > >>> > > > Hi Vijay, >>> > > > >>> > > > If i run the same command directly on the brick... >>> >>> What does this mean then? Running directly on the brick to me means >>> running directly on the SSD. The command below is the same thing as above, >>> what changed? >>> >>> -b >>> >>> > > > >>> > > > [root at cpu01 1]# dd if=/dev/zero of=test bs=64k count=4k >>> oflag=dsync >>> > > > 4096+0 records in >>> > > > 4096+0 records out >>> > > > 268435456 bytes (268 MB) copied, 16.8022 s, 16.0 MB/s >>> > > > [root at cpu01 1]# pwd >>> > > > /bricks/1 >>> > > > [root at cpu01 1]# >>> > > > >>> > > >>> > > This is your problem. Gluster is only as fast as its slowest piece, >>> and >>> > > here your storage is the bottleneck. Being that you get 16 MB to >>> the brick >>> > > and 12 to gluster that works out to about 25% overhead which is what >>> I >>> > > would expect with a single thread, single brick, single client >>> scenario. >>> > > This may have something to do with the way SSDs write? On my SSD at >>> my >>> > > desk I only get 11.4 MB / sec when I run that DD command: >>> > > >>> > > # dd if=/dev/zero of=test bs=64k count=4k oflag=dsync >>> > > 4096+0 records in >>> > > 4096+0 records out >>> > > 268435456 bytes (268 MB) copied, 23.065 s, 11.4 MB/s >>> > > >>> > > My thought is that maybe using dsync is forcing the SSD to clean the >>> data >>> > > or something else before writing to it: >>> > > >>> > > http://www.blog.solidstatediskshop.com/2012/how-does-an-ssd-write/ >>> > > >>> > > Do your drives support fstrim? It may be worth it to trim before >>> you run >>> > > and see what results you get. Other than tuning the SSD / OS to >>> perform >>> > > better on the back end there isn't much we can do from the gluster >>> > > perspective on that specific DD w/ the dsync flag. >>> > > >>> > > -b >>> > > >>> > > > >>> > > > On Wed, Apr 8, 2015 at 6:44 PM, Vijay Bellur < vbellur at redhat.com >>> > >>> > > wrote: >>> > > > >>> > > > >>> > > > >>> > > > On 04/08/2015 02:57 PM, Punit Dambiwal wrote: >>> > > > >>> > > > >>> > > > >>> > > > Hi, >>> > > > >>> > > > I am getting very slow throughput in the glusterfs (dead >>> slow...even >>> > > > SATA is better) ... i am using all SSD in my environment..... >>> > > > >>> > > > I have the following setup :- >>> > > > A. 4* host machine with Centos 7(Glusterfs 3.6.2 | Distributed >>> > > > Replicated | replica=2) >>> > > > B. Each server has 24 SSD as bricks?(Without HW Raid | JBOD) >>> > > > C. Each server has 2 Additional ssd for OS? >>> > > > D. Network 2*10G with bonding?(2*E5 CPU and 64GB RAM) >>> > > > >>> > > > Note :- Performance/Throughput slower then Normal SATA 7200 >>> RPM?even i >>> > > > am using all SSD in my ENV.. >>> > > > >>> > > > Gluster Volume options :- >>> > > > >>> > > > +++++++++++++++ >>> > > > Options Reconfigured: >>> > > > performance.nfs.write-behind- window-size: 1024MB >>> > > > performance.io-thread-count: 32 >>> > > > performance.cache-size: 1024MB >>> > > > cluster.quorum-type: auto >>> > > > cluster.server-quorum-type: server >>> > > > diagnostics.count-fop-hits: on >>> > > > diagnostics.latency- measurement: on >>> > > > nfs.disable: on >>> > > > user.cifs: enable >>> > > > auth.allow: * >>> > > > performance.quick-read: off >>> > > > performance.read-ahead: off >>> > > > performance.io-cache: off >>> > > > performance.stat-prefetch: off >>> > > > cluster.eager-lock: enable >>> > > > network.remote-dio: enable >>> > > > storage.owner-uid: 36 >>> > > > storage.owner-gid: 36 >>> > > > server.allow-insecure: on >>> > > > network.ping-timeout: 0 >>> > > > diagnostics.brick-log-level: INFO >>> > > > +++++++++++++++++++ >>> > > > >>> > > > Test with SATA and Glusterfs SSD?. >>> > > > ??????? >>> > > > Dell EQL (SATA disk 7200 RPM) >>> > > > ?- >>> > > > [root at mirror ~]# >>> > > > 4096+0 records in >>> > > > 4096+0 records out >>> > > > 268435456 bytes (268 MB) copied, 20.7763 s, 12.9 MB/s >>> > > > [root at mirror ~]# dd if=/dev/zero of=test bs=64k count=4k >>> oflag=dsync >>> > > > 4096+0 records in >>> > > > 4096+0 records out >>> > > > 268435456 bytes (268 MB) copied, 23.5947 s, 11.4 MB/s >>> > > > >>> > > > GlsuterFS SSD >>> > > > ? >>> > > > [root at sv-VPN1 ~]# dd if=/dev/zero of=test bs=64k count=4k >>> oflag=dsync >>> > > > 4096+0 records in >>> > > > 4096+0 records out >>> > > > 268435456 bytes (268 MB) copied, 66.2572 s, 4.1 MB/s >>> > > > [root at sv-VPN1 ~]# dd if=/dev/zero of=test bs=64k count=4k >>> oflag=dsync >>> > > > 4096+0 records in >>> > > > 4096+0 records out >>> > > > 268435456 bytes (268 MB) copied, 62.6922 s, 4.3 MB/s >>> > > > ???????? >>> > > > >>> > > > Please let me know what i should do to improve the performance of >>> my >>> > > > glusterfs? >>> > > > >>> > > > >>> > > > What is the throughput that you get when you run these commands on >>> the >>> > > disks >>> > > > directly without gluster in the picture? >>> > > > >>> > > > By running dd with dsync you are ensuring that there is no >>> buffering >>> > > anywhere >>> > > > in the stack and that is the reason why low throughput is being >>> observed. >>> > > > >>> > > > -Vijay >>> > > > >>> > > > -Vijay >>> > > > >>> > > > >>> > > > >>> > > > _______________________________________________ >>> > > > Gluster-users mailing list >>> > > > Gluster-users at gluster.org >>> > > > http://www.gluster.org/mailman/listinfo/gluster-users >>> > > >>> > >>> >> >> >> _______________________________________________ >> Gluster-users mailing list >> Gluster-users at gluster.org >> http://www.gluster.org/mailman/listinfo/gluster-users >> > >-------------- next part -------------- An HTML attachment was scrubbed... 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