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29 questions
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The goal is to create a mirror (aka raid1) device from two devices (to be mirrored), and (if needed) a third device that serves as the dirty region log / metadata / whatever. That, without using LVM ...
Elisa K. K.'s user avatar
  • 149
0 votes
1 answer
132 views

In md we can scan or assemble an array using UUID: mdadm --assemble "/dev/md/raid5" --uuid "b9a09187:a1ac838f:b4e90395:d6293c19" And in ZFS, we have a service for that purpose: rc-...
Livy's user avatar
  • 455
1 vote
0 answers
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Every time md (or is it mdcheck?) performs a RAID check or pauses/continues it, the screen of my device turns on. These are the relevant syslog entries, the screen turned on at 6:15: Jul 4 06:11:25 ...
Daniel F's user avatar
  • 947
1 vote
1 answer
3k views

I have a Linux md-raid raid1 array (ext4 fs), with 2 3TB disks. The array has been showing significant slowness in access and read times over the last few months. Doing an ls on a directory w/ less ...
baronmog's user avatar
  • 21
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We have an old backup server with lots of disks and one mount with md raid 5 setup has now frozen. How to diagnose the problem and get it to running again? I would like to avoid restarting the whole ...
Mikko Rantalainen's user avatar
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1 answer
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md0 : active raid5 sdc2[5](S) sda2[4] sdd2[3](F) sdb2[1] 17510688768 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/2] [UU__] What happend: sdc failed I have repleaced it with a new HDD ...
zephyr.b6's user avatar
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2 votes
1 answer
339 views

Does the md subsystem output any messages (to syslog/systemd-journal) to indicate that it's running in a degraded state (or anything else that might indicate that it has successfully reacted to a ...
jhfrontz's user avatar
  • 359
11 votes
2 answers
10k views

On Ubuntu 18.04 I create a RAID 1 array like this: mdadm --create /dev/md/myarray --level=1 --run --raid-devices=2 /dev/sdc /dev/sdd I then add the output of mdadm --detail --scan /dev/md/myarray to /...
EM0's user avatar
  • 515
5 votes
1 answer
1k views

I have a 2 disk CentOS 7 machine build that I need data integrity / bitrot protection on. How can I achieve this? Note from my reading btrfs,zfs and DM-Integrity does not seem to be options. Btrfs ...
MeData's user avatar
  • 61
1 vote
1 answer
100 views

I added this command in Dolphin menu for convert a .md (Mark Down) file to .odt (Open Document Text ) file: pandoc %U -o %F.odt and I get the right file, but with two extension: fileorig.md.odt How ...
Duns's user avatar
  • 111
3 votes
1 answer
2k views

In linux mdadm man page I saw the option "--write-journal". How does this relate to lvmcache as lvmcache is built on top of dm-cache? Are they different things or does lvmcache do something like "--...
user220574's user avatar
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663 views

After some crash on a RAID1 I did some investigation and tests. Doing the following: # dd if=/dev/zero of=1 bs=1M count=256 # dd if=/dev/zero of=2 bs=1M count=256 # losetup /dev/loop1 1 # losetup /...
Emilio Lazo's user avatar
  • 253
3 votes
1 answer
24k views

I have Ubuntu 16.04 host with 3 Ubuntu 17.10 guests in KVM (Virtual Machine Manager 1.3.2). I export several block devices from 2 guests to the other guest (let's call it frontend) via iSCSI portal ...
ikudyk's user avatar
  • 93
2 votes
1 answer
4k views

I'd like to put a EFI system partition on top of a MD RAID 1 + LVM setup. So the ESP would be a Logical Volume on top of the MD RAID device. I've heard mixed things about whether this is possible. Has ...
Faheem Mitha's user avatar
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1 vote
0 answers
526 views

I added a new drive to my RAID6 array, before I added the drive my array looked like this $ cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md0 : active raid6 sde[5] sdc[1] sdb[6] sdf[4] ...
Azelphur's user avatar
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