All Questions
122
questions
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1
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Software RAID Nonfunctional after power outage
My server lost power yesterday. It automatically booted up when power came back, but my RAID is now nonfunctional.
The RAID array is a software RAID6 built with mdadm. Originally, the array used 8 ...
- 31
1
vote
1
answer
577
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Functional MD complex RAID10 suddenly marks all drives as spares
This morning during a long ~1.5TB read operation sending data to an NFS client, my md complex-RAID10 array spontaneously stopped, then dropped four members for being "non-fresh" and failed to start ...
- 151
1
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1
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4k
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Linux MD software raid stripe cache size
From what I can piece together the /sys/block/md0/md/stripe_cache_size is for raid5 and 6 set at a very low default value to avoid starving machines for memory.
By increasing this value you can get a ...
- 1,260
1
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2
answers
586
views
Migrate mdadm raid array from 32bit to 64bit debian squeeze
I have a raid5 array running on Debian Squeeze 32bit (x86) and I plan to upgrade to Debian Squeeze 64bit (amd64).
To keep my raid5 array and ext4 filesystem I simply keep a copy of my mdadm.conf file....
- 1,260
1
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2
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2k
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mdadm - Raid 1 arrays do not assemble after reboot
I rebooted my server after creating 3 raid 1 arrays with mdadm, and after rebooting, systemd was spitting out errors about the raid devices timing out when trying to assemble them at boot.
I was given ...
- 2,984
1
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1
answer
1k
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MDADM Raid Recovery and Questions
I've been working through this in my head for the entire day, and wanted to branch out and get some feedback/opinions on this setup, and how I can handle it if it ever happens to fail.
I have a ...
- 115
1
vote
1
answer
708
views
How to proceed after creating software RAID 1 array on Linux
So, I've created a RAID 1 array using two 500 GB hard drives.
I used a Linux Mint Boot Disk, and then used mdadm to create the RAID 1 array using 2 hard drives, each which has a single primary ...
- 339
1
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2
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4k
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mdadm one disk sometimes is missing after reboot
On a debian system my home directory is on a raid1 md array. After creation it worked fine for some time, but once the second drive disappeared from the array.
# cat /proc/mdstat
Personalities : [...
- 116
1
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1
answer
2k
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mdadm --assemble fails when /dev/sd[abcde]1 reordered
I am having trouble assembling a small RAID5 due to a recurring reordering of /dev/sd[a-f] on boot (Debian7).
md0 was initially using sd[abc]1, it contains a LUKS device, which in turn contains a ...
- 21
1
vote
1
answer
297
views
Clean up left-over around a RAID5 coming from a QNAP NAS
I just moved a 12TB RAID5 (4 disks of 4TB) from my QNAP NAS into my Linux Server (/dev/md0), and I noticed that there are three "left-over" partitions on each disk (/dev/sd*1, /dev/sd*2, /...
- 31
1
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0
answers
219
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Is it possible to create a RAID from only partial disk?
We have a dual boot system where we install firmare on two partitions, additionally we have a data partition. We have two disks on the system and I wonder if we can create a raid for the data ...
- 121
1
vote
1
answer
623
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Way to monitor progress of RAID10 rebuilding disks, when RAID does not show in /proc/mdstat?
I have an inactive RAID 10, and the output of mdadm --assemble --scan -v |& tail -17 is:
mdadm: /dev/sdn1 is identified as a member of /dev/md/10, slot 5.
mdadm: /dev/sdk1 is identified as a ...
- 1,163
1
vote
2
answers
2k
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How to migrate mdadm RAID10 with 4 disks to RAID5?
I have a software RAID10 based on Linux’ mdadm under Debian Buster. Originally I found RAID10 had best performance. But I need more space and accept to trade some write performance for +50% space.
# ...
- 845
1
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0
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569
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Error when trying to reduce number of drives in a Linux RAID array
I’ve got a Synology NAS that I’m trying to reduce a RAID6 array from 12 drives down to 11 drives.
I’ve already reduced the size of the file system and logical volume, but when I try to reduce the ...
- 11
1
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0
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23
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Remounting imperfect RAID 6 after clean install
I am running a small laboratory server (intermediate logins and data storage). It has 5 physical drives: one (sda) for /, and 4-drive RAID 6 (sd[b-e]) for /home. Due to a hardware fault, I had to ...
