Server Fault Stack Exchange
Server Fault Stack Exchange

Questions tagged [raid6]

RAID6 is a method of configuring fault-tolerant hard drive storage. It is similar to RAID5, but differs in that it writes two sets of parity information, thus can survive the simultaneous failure of two hard drives.

125 questions
6
votes
1 answer

RAID-5 or RAID-6 - is RAID-5 really that bad?

Possible Duplicate: Which is better: RAID5 + 1 Hotspare / RAID6? I need to decide myself between RAID5 and RAID6. The servers have a hardware-RAID controller and 6 drives each. The drives are RE3 enterprise western digital 1TB drives. The data…
kei1aeh5quahQu4U
  • 445
  • 5
  • 22
6
votes
1 answer

3Ware 9650SE RAID-6, two degraded drives, one ECC, rebuild stuck

This morning I came in the office to discover that two of the drives on a RAID-6, 3ware 9650SE controller were marked as degraded and it was rebuilding the array. After getting to about 4%, it got ECC errors on a third drive (this may have happened…
cswingle
  • 276
  • 2
  • 7
5
votes
1 answer

How to recover mdadm raid6 array? mount: can't read superblock. 8/13 drives show all drives present, 5/13 drives show only 5 drives present

I rebooted my server today to find it hanging. I commented out the entry in fstab that loads /dev/md0 and the machine proceeded to boot. The raid was accessible and working prior to the reboot, I only rebooted because of system updates. The server…
Jieiku
  • 171
  • 6
5
votes
1 answer

Linux mdadm --grow RAID6: Something wrong - reshape aborted

I have a RAID60 that I want to expand. The current is: 2 axles each having 9 disks + 2 spares. The future is: 4 axles each having 10 disks + 1 spare. So I need to do some --grow to reshape the drives. I thought this would be enough: mdadm -v --grow…
Ole Tange
  • 2,946
  • 6
  • 32
  • 47
5
votes
2 answers

Linux software RAID6: rebuild slow

I am trying to find the bottleneck in the rebuilding of a software raid6. ## Pause rebuilding when measuring raw I/O performance # echo 1 > /proc/sys/dev/raid/speed_limit_min # echo 1 > /proc/sys/dev/raid/speed_limit_max ## Drop caches so that does…
Ole Tange
  • 2,946
  • 6
  • 32
  • 47
5
votes
1 answer

3 drives fell out of Raid6 mdadm - rebuilding?

i had an mdadm raid6 array with 13x1TB drives. Within 10 minutes 3 of these drives fell out of the array... we assume bad cable to the controller card and replaced, however now we need to get the drives back into a working array. because md0 was…
pironic
  • 51
  • 3
4
votes
1 answer

XFS very slow on LVMed Raid 6

i have a new storage server with 6 x 8TB WD Red HDDs. They build a RAID 6 with mdadm and a chunk size of 256k. On top of that mdraid i have LVM which then holds the different filesystems. Initially i wanted to use XFS as filesystem, but the…
teissler
  • 758
  • 7
  • 11
4
votes
2 answers

Linux mdraid RAID 6, disks drop out randomly every few days

I have some servers that run Debian 8 with 8x800GB SSD configured as RAID6. All disks are connected to a LSI-3008 flashed to IT mode. In each server I also have a 2-disk pair as RAID1 for the OS. current state # dpkg -l|grep mdad ii mdadm …
junior_h
  • 41
  • 3
4
votes
1 answer

Backup Solutions for 20 TB of data

First, some background on out situation. We're a small-medium business who has around 20 TB of data on two different NAS's, and that number grows by at least 10% annually. 90% of this data we need to keep for legal reasons related to the work we do,…
Zxero88
  • 41
  • 2
4
votes
2 answers

Why does ZFS RAIDZ2 only use 2GB of data when I create a 1GB File

I have created a ZFS RAIDZ2 / Raid 6 file system, which from what I believe will store parity on 2 disks. root@zfs-demo:/data# zpool status pool: data state: ONLINE config: NAME STATE READ WRITE CKSUM data …
PrestonDocks
  • 215
  • 3
  • 11
3
votes
1 answer

HP Smart Array P812 - Why is my Raid 60 gone?

I've got an HP ProLiant DL380 Gen7 with a Smart Array P812 which is connected to an MSA20 that houses 19 600GB drives. After my VMs didn't boot up, I checked my array config and 2 drives failed: => ctrl slot=1 logicaldrive 1 show Smart Array P812…
Canonip
  • 41
  • 2
3
votes
1 answer

Upgrading RAID6 drives with larger capacity (Best practices)

I have been tasked with upgrading an existing RAID6 array with new disks. Currently we have a 6 disk setup with 1 hot-swap. This is inside a Dell R340 with a PERC H730 Mini controller. I have not been able to verify yet if hot-swap is enabled. The…
David Whitcomb
  • 33
  • 1
  • 5
3
votes
2 answers

Remove second RAID6 drive during resync from first failure?

I have a RAID6 comprised of five 1TB drives in good working order. I'd like to redistribute the array differently in my system (change the drive distribution over controller cards). I pulled the first drive and placed it where I want it; now I just…
Tim
  • 1,158
  • 1
  • 14
  • 23
3
votes
0 answers

What could go wrong with ext4 on LVM on a hardware RAID6?

Intro Recently one of my systems using ext4 on LVM on hardware RAID6 experienced a disastrous failure. To name some of the disasters: several filesystems failed beyond repair, at least one was granted ladders to heavens. It really took me by…
PF4Public
  • 219
  • 2
  • 13
3
votes
1 answer

recover highly degraded raid array

I have a Linux RAID6 array (mdadm) composed of 8 disks. 2 disks failed. I replaced them, now I have 2 new empty disks. I would like to rebuild the raid but when I start a raid rebuild, the rebuild fails because a third disk is showing read errors…
exeral
  • 1,787
  • 11
  • 21
1
2
3
…
8 9