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Questions tagged [raid]

RAID - Redundant Array of Independent Disks. A Storage technology to provide redundancy and performance, to reduce I/O bottlenecks involved in using multiple disks for large storage.

The basic idea of RAID was to combine multiple small, independent disk drives into an array of disk drives which yields performance exceeding that of a Single Large Expensive Drive (SLED). Additionally, this array of drives appears to the computer as a single logical storage unit or drive.

More at Wikipedia : http://en.wikipedia.org/wiki/RAID

803 questions
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Disassemble a RAID 1 arragement without removing/reinstalling the system

I've set up a Soft Raid 1 using Debians built in RAID systems. I set up the raid because I had a space HDD when I set up the server and thought why not. The RAID is set up using what-ever Debian did when I installed the OS (sorry, not a linux…
Jonas Laursen
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5
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3 answers

Software RAID 5 and 6 stripe size: why smaller is less efficient?

I read here and then that small stripe size is bad for software (and maybe hardware) RAID 5 and 6 in Linux. The rare benchmarks I saw fully agree with that. But the explanation given by everybody is this induce more head movements. I just don't…
Gregory MOUSSAT
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2 answers

Linux software RAID-1 and device name

I want to set up software RAID-1 on my Ubuntu system, and found this example of an /etc/raidtab: raiddev /dev/md0 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 device /dev/sdb1 …
Magnus
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4
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2 answers

RAID setups questions

I have a RAID setup questions My mobo supports hardware RAID, my question is, should I use the board's RAID system or freeNAS/Ubuntu's software RAID system? I realize performance is better with h/w, but my concern is what happens when a drive fails?…
David Morin
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3
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1 answer

Making two drives show as one on debian?

I rented a server from a provider and they won't install RAID0 without an additional fee. So I'm trying to figure out how to link these two drives so that my programs that are installed on the hard disk will see the space from the second drive. This…
linuxscrub20
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3
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2 answers

Raid array 'clean, degraded'?

Today I noticed that there are bunch of messages complaining about the RAID array (it's a software RAID10), so I started looking into it but need help because I'm unsure if I interpret the status output correctly (I've kinda forgotten the actual…
Kārlis K.
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0 answers

SoftRAID 10 corrupted after reboot. Possibly due to sector alignment

Centos 7. SoftRAID 10 corrupted after reboot. Raid 10 and ext4 was created(1,2). After the standard procedures, I did the full array alignment of the sectors (3). Don`t ask me. After that, 4 months of work passed. Raid didn't start after reboot (4).…
V. Kifirenko
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2
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1 answer

mdadm raid6 failed to start I/O error state active,FAILED,not started

I'm trying to get a raid6 array to run, but it will not start. Brief array history: This array was initially built with 6 disks (8TB each). mdadm --create --verbose /dev/md1 --level=6 --raid-devices=6 /dev/sdb1 /dev/sde1 /dev/sdg1 /dev/sdh1…
krupton
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2
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0 answers

Raid 5 overwritten with Fedora server installation

I have mistakenly installed Fedora server on my RAID 5 rahter on a SSD. Now the raid is not mounting: # mount /dev/md0 /mnt/raid mount: /mnt/raid: wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other…
Avi
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4 answers

How to find the device in a RAID1 under Linux?

besides: head -2 /dev/dm-16 | strings | grep ^id how can I find that which device belongs to a given MD RAID1 array?
gasko peter
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1
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After xfs repair, only files from root user are accessible

After a power failure during server installation of CentOS, the external storage system that contains user data could not be mounted due to failed superblocks. I performed an xfs_repair on the system, which worked fine, but only the directories that…
Daneera
  • 11
1
vote
1 answer

Cannot get status of "Adaptec AAC-RAID (Rocket) (rev 02)" HW RAID card

SERVER:~ # lspci | grep -i raid 0000:04:00.0 RAID bus controller: Adaptec AAC-RAID (Rocket) (rev 02) SERVER:~ # arcconf getconfig 1 pd and after the arcconf, the command just hangs.. the server seems OK. But the stucked arcconf struggles me, could…
evachristine
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0
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Is possible that Software RAID 6 kick the / partition without automatically re-arrange array?

I have a Raid 6 configuration with 14 HD (16Tb each one) They are configured in this way: /dev/md0 /swap /dev/md1 /boot /dev/md2 / /dev/md3 /home and drives are: sda,sdb,sdc...sdn Each unity is configured in this way: /dev/md0 ->…
Marcello Kad
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0
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1 answer

Non existent RAID causing crash

I have nonexistent RAID according to mdadm md10. It periodically totally crashes my OS with an error: timed out ... accessing md10. Is there another way to delete this - it REALLY does not exist in mdadm nor elsewhere like gparted doesn't see it…
anne
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0
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1 answer

Apparently destroyed RAID array by running fsck on HDD partitions. What can be done?

Ubuntu 18.04 Desktop. 5 x 2TB disks in RAID 6 array. lsblk sda 8:0 0 2.7T 0 disk ├─sda1 8:1 0 512M 0 part /boot/efi └─sda2 8:2 0 2.7T 0 part / sdb 8:16 0 1.8T 0 disk └─sdb1 8:17 0 1.8T 0 part sdc …
FJZappa
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