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Questions tagged [raidz]

67 questions
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ZFS: 3 devices: what's the difference between mirror and raidz2?

It would seem like with 3 devices, it's possible to configure a ZFS pool with either mirror or raidz2 mode. What's the difference in performance and reliability? (In regards to reliability, I'm specifically interested in the topic of partial data…
cnst
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FreeNAS confusion: not sure what happened. raidz1 "DEGRADED", disk "FAULTED"

Sorry for the long narrative, but I'm thoroughly confused. I'm using FreeNAS-8.0.4-RELEASE-p2-x64 (11367) on a box with 5x3TB SATA disks configured as a raidz volume. A few days ago, the console gave me this alert: CRITICAL: The volume raid-5x3…
Dan
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6* HDD ,2*SSD, Freebsd, Raidz2 or hardware R6?

Possible Duplicate: Does ZFS replace the need for hardware/software RAID? I want to install Freebsd 9 on our servers. We have 6 HDD and 2SDD. SDD will be used for database. For now we're planning to use Raidz2 for HDD instead of Hardware…
Meteor
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Use QLC SSDs as RAIDZ (scientific archive)?

We are building a system for the archival and scientific analysis of some weather data. The setup is redundant, with two HP DL580, Proxmox (ZoL) and some GPUs for analysis. On each server we plan 5 pools of around 50 TB. We use SSDs for density…
Benoit
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Failing ZFS Raid-Z2, need to build new pool but lack a SAS port. Can I disconnect one drive from Raid-Z2?

I have a Raid-Z2 pool with 6 * 4TB drives. All the drives have a bit over 40 000 hours running time. Now they all seem to be degrading at the same time. The pool is degraded, and all drives are marked as degraded with to many errors. But luckily no…
Northern Brewer
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ZFS 2xRAIDZ2 vs 3xRAIDZ2 iops increase or not

12 hdds - 100MB/s streaming reads and writes and 250 read and write IOPS. When i do 2xRAIDZ2 so there is 2 vdev 6 HDD each the theoretical IOPS will be 500 according to this atricle:…
Kriss
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ZFS Permanant errors dectected in the following files (<0xf49a>:<0x390aff>)

I had to replace one of my hard drives in our storage array and now I'm getting the following message pool: vol0 state: ONLINE status: One or more devices has experienced an error resulting in data corruption. Applications may be…
Chris
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zfs convert linear to raidz5 or rebuild

Can i convert my linear span to a raidz-5? I finally have enough hard drives, and dont really want to thrash them about refilling with the backup data that they need to be holding. so currently, the command i built is not raid, but uses linear…
Brian Thomas
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Touching ZFS volume causing OS to freeze, drives reportedly OK

Having massive issues with 4 brand new 3TB WD Red drives I just got. Trying to setup raidz2 using "native zfs" with all 4 on ubuntu 14.04.1, which works initially until I start trying to copy data over to the mounted volume. I've run badblocks on…
shousper
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Why is my RAIDZ2 pool larger than the expected size calculation?

I'm building a RAIDZ2 ZFS system, using Ubuntu 13.10 as a base system, and zfsonlinux's packages, having 6 disks dedicated to the pool data and a couple of SSD partitions to do ZIL log and L2ARC cache. My HDDs are all 2.0 TiB (in fact: slightly less…
starlocke
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Too much free space on FreeNAS - ZFS

I have a FreeNAS server with 3 x 2 To disks in raidz1. I would expect to have about 4 To of space available. When I run zpool list I get: [root@freenas] ~# zpool list NAME SIZE USED AVAIL CAP HEALTH ALTROOT main_volume 5.44T 3.95T…
Guillaume
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Zfs Drive config on FreeNas

Couple of related questions. Background: I have a stock of drives lying about that I want to use in a HP Proliant Microserver which has a 4 slot SAS cage with FreeNas. I don't want to spend any more on parts. 1) With Zfs and RAIDZ, how bad would it…
Martyn
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is zfs disk rotting protection automatic and built in?

some presentation declares that zfs has: zfs can detect and correct silent data corruption. e.g. from here http://www.eecis.udel.edu/~bmiller/DE-OSUG/ECECIS-ZFS.pdf But do you need to allocate some spare disk or zfs pool to do it mannually? or…
c2h2
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ZFS - setting physical disk start point of pool/filesystem

I'm testing harddisk performance, and would like to test writing to the outer tracks of my harddisk with ZFS. One way of doing this would be to create a pool/filesystem with a start point just a few Gigs away from the end of my harddisk. Is this…
poplitea
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A few questions about RAID-Z

I just got 3 one terabyte HDDs to put into my small NAS box. I plan on raiding these together with RAID-Z (ZFS, if I'm not mistaken). I've done a lot of research, but there doesn't seem to be very much good information for my questions. So here…
Jess
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