search for: raid6

Hi What is the general state of btrfs RAID6 as of kernel 3.13-rc1 and the latest btrfs tools? More specifically: - Is it able to correct errors during scrubs? - Is it able to transparently handle disk failures without downtime? - Is it possible to convert btrfs RAID10 to RAID6 without recreating the fs? - Is it possible to add/remove drives...

Hi all, we got a new test system here and I just also tested btrfs raid6 on that. Write performance is slightly lower than hw-raid (LSI megasas) and md-raid6, but it probably would be much better than any of these two, if it wouldn''t read all the during the writes. Is this a known issue? This is with linux-3.9.2. Thanks, Bernd -- To unsubscribe from this...

Hello, ?s there anyway to create raid6 or raid5 level glusterfs installation ? >From docs I undetstood that I can do raid1 base glusterfs installation or radi0 (strapting data too all servers ) and raid10 based solution but raid10 based solution is not cost effective because need too much server. Do you have a plan for keep...

I notice that raid6 is recommended in the manual. eg. "...RAID6 is a must." http://manual.lustre.org/manual/LustreManual16_HTML/DynamicHTML-11-1.html which I found a bit surprising given that in Dec ''06 Peter Braam said on this list "Some of our customers experienced data corruption in the R...

...t-glib-0.1.7, virt-manager 0.10.0-r1 when i set on virtual machine "cache=none" in the disk-menu, the machine faults to start with: << Fehler beim Starten der Domain: Interner Fehler: Prozess während der Verbindungsaufnahme zum Monitor beendet :qemu-system-x86_64: -drive file=/raid6/virtual/debian-kaspersky.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=native: could not open disk image /raid6/virtual/debian-kaspersky.img: Invalid argument Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 100, in cb...

Is anyone using RAID6 in production? In moving from hardware RAID on my dual 3ware 7500-8 based systems to md, I decided I'd like to go with RAID6 (since md is less tolerant of marginal drives than is 3ware). I did some benchmarking and was getting decent speeds with a 128KiB chunksize. So the next step was fai...

...ssed something here? Thanks! /jon ***************gluster volume info************************ Volume Name: glusterKumiko Type: Distribute Volume ID: 8f639d0f-9099-46b4-b597-244d89def5bd Status: Started Number of Bricks: 4 Transport-type: tcp,rdma Bricks: Brick1: kumiko01:/mnt/raid6 Brick2: kumiko02:/mnt/raid6 Brick3: kumiko03:/mnt/raid6 Brick4: kumiko04:/mnt/raid6 Options Reconfigured: cluster.min-free-disk: 20% -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://supercolony.gluster.org/pipermail/gluster-users/attachments/20130...

...ay the merge: - Better rebuild support -- if we lose a disk and add a replacement, we want to recreate only the contents of that disk, rather than allocating a new chunk elsewhere and then rewriting _everything_. - Support for more than 2 redundant blocks per stripe (RAID[789] or RAID6[³⁴⁵] or whatever we''ll call it). - RAID[56789]0 support. - Clean up the discard support to do the right thing. -- David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation -- To unsubscribe fro...

CentOS 6.3, x86_64. I have noticed when building a new software RAID-6 array on CentOS 6.3 that the mismatch_cnt grows monotonically while the array is building: # cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md11 : active raid6 sdg[5] sdf[4] sde[3] sdd[2] sdc[1] sdb[0] 3904890880 blocks super 1.2 level 6, 512k chunk, algorithm 2 [6/6] [UUUUUU] [==================>..] resync = 90.2% (880765600/976222720) finish=44.6min speed=35653K/sec # cat /sys/block/md11/md/mismatc...

...od: missing operand after `b'' Special files require major and minor device numbers. Try `/bin/mknod --help'' for more information. raid5: automatically using best checksumming function: pIII_sse pIII_sse : 1352.800 MB/sec raid5: using function: pIII_sse (1352.800 MB/sec) raid6: int32x1 635 MB/s raid6: int32x2 821 MB/s raid6: int32x4 686 MB/s raid6: int32x8 557 MB/s raid6: mmxx1 1709 MB/s raid6: mmxx2 1978 MB/s raid6: sse1x1 1044 MB/s raid6: sse1x2 1156 MB/s raid6: sse2x1 1982 MB/s raid6: sse2x2 2062 MB/s raid6: using algorithm ss...

i have 6 sata hdd 2 TB . i want install centos 7 on these hdd in raid 6 mode. how can i do it ?

We discussed using the top bits of the chunk type field field to store a number of redundant disks -- so instead of RAID5, RAID6, etc., we end up with a single ''RAID56'' flag, and the amount of redundancy is stored elsewhere. This attempts it, but I hate it and don''t really want to do it. The type field is designed as a bitmask, and _used_ as a bitmask in a number of places -- I think it''s...

...probably not restartable, you quite likely > will lose the whole volume) Doesn't mdraid support changing RAID levels? I think it will even do it reasonably safely (though still better not to have a power failure!). I have a vague memory of adding a drive to a RAID5 and converting it to a RAID6 but I could be misremembering. --keith -- kkeller at wombat.san-francisco.ca.us

Hi, I am trying to create a 10 drive raid6 array. OS is Centos 5.3 (64 Bit) All 10 drives are 2T in size. device sd{a,b,c,d,e,f} are on my motherboard device sd{i,j,k,l} are on a pci express areca card (relevant lspci info below) #lspci 06:0e.0 RAID bus controller: Areca Technology Corp. ARC-1210 4-Port PCI-Express to SATA RAID Controll...

Hello all, Testing stuff virtually over here before taking it to the physical servers. I found a shortcut for creating a software RAID 10 ("--level=10"), device in CentOS 6. Looking at the below, I don't see anything about a shortcut for RAID 60. https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/htm l/Storage_Administration_Guide/s1-raid-levels.html Is RAID

Hello All I have a brand spanking new 40TB Hardware Raid6 array to play around with. I am looking for recommendations for which filesystem to use. I am trying not to break this up into multiple file systems as we are going to use it for backups. Other factors is performance and reliability. CentOS 5.6 array is /dev/sdb So here is what I have tried s...

...raid1 personality registered for level 1 [ 0.747314] xor: automatically using best checksumming function: generic_sse [ 0.765850] generic_sse: 3034.000 MB/sec [ 0.765855] xor: using function: generic_sse (3034.000 MB/sec) [ 0.766563] async_tx: api initialized (async) [ 0.833914] raid6: int64x1 1456 MB/s [ 0.901926] raid6: int64x2 2047 MB/s [ 0.969941] raid6: int64x4 2176 MB/s [ 1.037972] raid6: int64x8 1912 MB/s [ 1.105987] raid6: sse2x1 2151 MB/s [ 1.174003] raid6: sse2x2 3157 MB/s [ 1.242040] raid6: sse2x4 3031 MB/s [ 1.242045] raid6: usin...

I have two openvz servers running Centos 6.x both with 32GB of RAM. One is an Intel Xeon E3-1230 quad core with two 4TB 7200 SATA drives in software RAID1. The other is an old HP DL380 dual quad core with 8 750GB 2.5" SATA drives in hardware RAID6. I want to figure out which one has better random I/O performance to host a busy container. The DL380 currently has one failed drive in the RAID6 array until I get down to replace it, will that degrade performance? Is there an easy way to test disk I/O? On a plain Gigabyte file copy the softwar...

...cache=none" in the disk-menu, the > >>machine faults to start with: > >> > >><< > >>Fehler beim Starten der Domain: Interner Fehler: Prozess während der > >>Verbindungsaufnahme zum Monitor beendet :qemu-system-x86_64: > >>-drive file=/raid6/virtual/debian-kaspersky.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,aio=native: > >>could not open disk image /raid6/virtual/debian-kaspersky.img: > >>Invalid argument > >> > >> > >>Traceback (most recent call last): > >> File &q...

...05f] > [ 0.243614] pci 0000:00:00.0: PCI bridge to [bus 01] > [ 0.244871] pci 0000:00:00.0: bridge window [io 0x10000-0x10fff] > [ 0.246514] pci 0000:00:00.0: bridge window [mem 0xc0100000-0xc01fffff] > [ 0.274019] bio: create slab <bio-0> at 0 > [ 0.341414] raid6: altivecx1 1458 MB/s > [ 0.409673] raid6: altivecx2 1815 MB/s > [ 0.477900] raid6: altivecx4 2740 MB/s > [ 0.546168] raid6: altivecx8 2824 MB/s > [ 0.615756] raid6: int64x1 454 MB/s > [ 0.683978] raid6: int64x2 828 MB/s > [ 0.752252] raid6: int64x4 12...