search for: iops

Hello, When approaching hosting providers for services, the first question many of them asked us was about the amount of IOPS the disk system should support. While we stress-tested our service, we recorded between 4000 and 6000 "merged io operations per second" as seen in "iostat -x" and collectd (varies between the different components of the system, we have a few such servers). A couple of hosting...

Benchmark shows small performance improvement on fusion io device. Before: seq-read : io=1,024MB, bw=19,982KB/s, iops=39,964, runt= 52475msec seq-write: io=1,024MB, bw=20,321KB/s, iops=40,641, runt= 51601msec rnd-read : io=1,024MB, bw=15,404KB/s, iops=30,808, runt= 68070msec rnd-write: io=1,024MB, bw=14,776KB/s, iops=29,552, runt= 70963msec After: seq-read : io=1,024MB, bw=20,343KB/s, iops=40,685, runt= 5...

Benchmark shows small performance improvement on fusion io device. Before: seq-read : io=1,024MB, bw=19,982KB/s, iops=39,964, runt= 52475msec seq-write: io=1,024MB, bw=20,321KB/s, iops=40,641, runt= 51601msec rnd-read : io=1,024MB, bw=15,404KB/s, iops=30,808, runt= 68070msec rnd-write: io=1,024MB, bw=14,776KB/s, iops=29,552, runt= 70963msec After: seq-read : io=1,024MB, bw=20,343KB/s, iops=40,685, runt= 5...

Hi, Seeing a drop-off in iops when more vcpu''s are added:- 3.8.2 kernel/xen-4.2.1/single domU/LVM backend/8GB RAM domU/2GB RAM dom0 dom0_max_vcpus=2 dom0_vcpus_pin domU 8 cores fio result 145k iops domU 10 cores fio result 99k iops domU 12 cores fio result 89k iops domU 14 cores fio result 81k iops ioping . -c 3...

Hi What are the disk IOPS required for Asterisk call recording? I am trying to find out number of disks required in RAID array to record 500 calls. Is there any formula to calculate IOPS required by Asterisk call recording? This will help me to find IOPS for different scale. If I assume that Asterisk will write data on d...

I figure this group will know better than any other I have contact with, is 700-800 I/Ops reasonable for a 7200 RPM SATA drive (1 TB Sun badged Seagate ST31000N in a J4400) ? I have a resilver running and am seeing about 700-800 writes/sec. on the hot spare as it resilvers. There is no other I/O activity on this box, as this is a remote replication target for production data. I have a the

...ity in SMP guests. If one CPU is doing virtqueue kick and another CPU touches the vblk->lock it will have to spin until virtqueue kick completes. This patch reduces system% CPU utilization in SMP guests that are running multithreaded I/O-bound workloads. The improvements are small but show as iops and SMP are increased. Khoa Huynh <khoa at us.ibm.com> provided initial performance data that indicates this optimization is worthwhile at high iops. Asias He <asias at redhat.com> reports the following fio results: Host: Linux 3.4.0+ #302 SMP x86_64 GNU/Linux Guest: same as host ker...

...ity in SMP guests. If one CPU is doing virtqueue kick and another CPU touches the vblk->lock it will have to spin until virtqueue kick completes. This patch reduces system% CPU utilization in SMP guests that are running multithreaded I/O-bound workloads. The improvements are small but show as iops and SMP are increased. Khoa Huynh <khoa at us.ibm.com> provided initial performance data that indicates this optimization is worthwhile at high iops. Asias He <asias at redhat.com> reports the following fio results: Host: Linux 3.4.0+ #302 SMP x86_64 GNU/Linux Guest: same as host ker...

I have a pool with a single SLOG device rated at Y iops. If I add a second (non-mirrored) SLOG device also rated at Y iops will my zpool now theoretically be able to handle 2Y iops? Or close to that? Thanks, Ray

...a virtio-scsi to SCSI core. Using a KVM guest with 32x vCPUs and 4G memory, the results for 4x random I/O now look like: workload | jobs | 25% write / 75% read | 75% write / 25% read -----------------|------|----------------------|--------------------- 1x rd_mcp LUN | 8 | ~155K IOPs | ~145K IOPs 16x rd_mcp LUNs | 16 | ~315K IOPs | ~305K IOPs 32x rd_mcp LUNs | 16 | ~425K IOPs | ~410K IOPs The full fio randrw results for the six test cases are attached below. Also, using a workload of fio numjobs > 16 currently makes performance...

...a virtio-scsi to SCSI core. Using a KVM guest with 32x vCPUs and 4G memory, the results for 4x random I/O now look like: workload | jobs | 25% write / 75% read | 75% write / 25% read -----------------|------|----------------------|--------------------- 1x rd_mcp LUN | 8 | ~155K IOPs | ~145K IOPs 16x rd_mcp LUNs | 16 | ~315K IOPs | ~305K IOPs 32x rd_mcp LUNs | 16 | ~425K IOPs | ~410K IOPs The full fio randrw results for the six test cases are attached below. Also, using a workload of fio numjobs > 16 currently makes performance...

...2011 month 12 day 22 svn rev 57956 language R version.string R version 2.14.1 (2011-12-22) I just few days back started using R for basic statistical analysis. I want to plot the graph of following information > df disk vmfs vmdk IOPS BW 1 naa.5000a7203007ed8f 3 eager 16886.77 65.96393 2 naa.5000a7203007ed8f 3 lazy 44623.15 174.3092 3 naa.5000a7203007ed8f 5 eager 16767.53 65.49815 4 naa.5000a7203007ed8f 5 lazy 45891.55 179.2639 > str(df) 'data.frame': 4 obs. of 5 variables: $ disk:List of 4...

Hi, for zfs raidz1, I know for random io, iops of a raidz1 vdev eqaul to one physical disk iops, since raidz1 is like raid5 , so is raid5 has same performance like raidz1? ie. random iops equal to one physical disk''s ipos. Regards Victor -- This message posted from opensolaris.org

Here are some more interesting numbers, concentrating on the memory plugin and RAM disks. All are done using 8 threads and multi-conn, on a single unloaded machine with 16 cores, using a Unix domain socket. (1) The memory plugin using the sparse array, as implemented upstream in 1.9.8: read: IOPS=103k, BW=401MiB/s (420MB/s)(46.0GiB/120002msec) write: IOPS=103k, BW=401MiB/s (420MB/s)(46.0GiB/120002msec) (2) I moved the locking to around calls to the sparse array code, and changed the thread model to parallel: read: IOPS=112k, BW=437MiB/s (458MB/s)(51.2GiB/120001msec) write: IOPS=112...

Hi people... Here we use Xen 4 with Debian Lenny... We''re using kernel 2.6.31.13 pvops... As a storage system, we use AoE devices... So, we installed VM''s on AoE partition... The "NAS" server is a Intel based baremetal with SATA hard disc... However, sometime I feeling that VM''s is so slow... Also, all VM has GPLPV drivers installed... So, I am thing about

...--gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=32 --size=256MB --readwrite=randwrite test: (g=0): rw=randwrite, bs=(R) 4096B-4096B, (W) 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=32 fio-3.1 Starting 1 process Jobs: 1 (f=1): [w(1)][100.0%][r=0KiB/s,w=17.3MiB/s][r=0,w=4422 IOPS][eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=42701: Tue Mar 20 15:05:23 2018 write: IOPS=4443, BW=17.4MiB/s (18.2MB/s)(256MiB/14748msec) bw ( KiB/s): min=16384, max=19184, per=99.92%, avg=17760.45, stdev=602.48, samples=29 iops : min= 4096, max= 4796, avg=4440.07, stdev=150....

Dear all, One can use ks.test(x,y) for a one-sample kolmogorov-smirnov test: x being the data sample y being a string specifying a distribution I notice the help on ks.test does not tell you how to get such a list. Is this a hole in my R knowledge? Where can I get a list of the strings specifying the possible distributions? and more specifically What would be the string and following

...qemu+ssh://192.168.1.91/system tcp://192.168.1.91". I have checked the > libvirt debug output, and make sure that the drive-mirror + NBD > migration method is used. > > Inside the VM, I use an I/O benchmark (Iometer) to generate an oltp > workload. I record the I/O performance (IOPS) before/during/after > migration. When the migration begins, the IOPS dropped by 30%-40%. > This is reasonable, because the migration I/O competes with the > workload I/O. However, during almost the last period of migration > (which is 66s in my case), the IOPS dropped dramatically, fro...

Hi, I have installed Xen on Linux 2.6.11.10 <http://2.6.11.10> and i am trying to do Asynchronous Direct IO on SAS drives. The application which does the asynchronous direct io on SAS drive is running on Domain 0. Actually the IOPs what i get for a 512Bytes IO size is 67, but if i do the same operation on Linux 2.6.11.10 <http://2.6.11.10> native kernel, i get 267 IOPs.Cananyone tell me why this huge differnece? Am i missing something? In the current setup on Xen, if i do Synchronous IO, then i am getting 265 IOPs whi...

...In my organization, we are about to implement Qmail Server. * The number of current users will be 800, in future it may increase upto 1200. * The number of concurrent users will be 300. I am the engineer to deploy the Qmail in Linux server. I need to tell the storage team on the IOPs requirement. I requested 8TB usable space for the mail storage (can scale up in future). Kindly provide your suggestion on this. Thanks & Regards, K.SasiKumar Systems Engineer, Locuz Enterprise Solutions Limited, Bangalore