All Questions
60
questions
3
votes
4
answers
10k
views
MDADM reshape really slow
To sum up : My raid reshape with mdadm is really slow.
The complete story : 3 days ago I realized that one of my disks from a raid 5 array was faulty. I removed it and replaced it with a brand new ...
- 63
4
votes
1
answer
13k
views
Does mdadm record array event history?
I received an automated email from the mdadm daemon:
A Fail event had been detected on md device /dev/md0.
It could be related to component device /dev/sdh.
I find the wording strange. "could be"? ...
- 358
2
votes
1
answer
4k
views
Assemble 3 drive software RAID5 with one disk missing
Is it possible to assemple a three drive software RAID5 with only two disks? I have one failed disk in my setup which i could not read at all but the two other disks are fine. So i created a dump of ...
- 133
2
votes
1
answer
4k
views
mdadm --examine displays something different than --detail
Who should I trust to fill my /etc/mdadm/mdadm.conf ?
mdadm --examine --scan returns /dev/md/0 while obviously it's /dev/md0 that is currently rebuilding
What should I put in my /etc/mdadm/mdadm.conf ...
- 441
0
votes
1
answer
458
views
mdadm: Reactivating RAID6 array after improper shutdown
I have a seven-disk RAID6 array on a file server. The server experienced a crash and a hard reset was required, resulting in an improper shutdown. Note that I/O activity was likely occurring on the ...
- 185
4
votes
1
answer
4k
views
MDADM RAID-0 does not increased size after grow on AWS Linux with EBS
I wanted to grew a Raid0 from 2 disks to 3 (each 1TB EBS on Amazon AWS) but the size did not change thereafter. The RAID started with two disks sdc and sdd and the new one was sdf.
Here is the grow-...
- 193
5
votes
4
answers
15k
views
New mdadm RAID vanish after reboot
I have problems with mdadm after reboot, I can't reassemble /dev/md0 .
I work on debian wheezy.
I have done the following steps::
sudo mdadm --create --verbose /dev/md0 --level=6 --raid-devices=4 /...
- 51
1
vote
1
answer
4k
views
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
6
votes
1
answer
504
views
mdadm: Win7-install created a boot partition on one of my RAID6 drives. How to rebuild?
My problem happened when I attempted to install Windows 7 on it's own SSD. The Linux OS I used which has knowledge of the software RAID system is on a SSD that I disconnected prior to the install. ...
- 191
0
votes
0
answers
511
views
Hybrid Raid-1 HDD + SSD -- Write Intent Bitmap
I am currently running a laptop with 1 HDD and 1SSD.
I currently am using mdadm to put some partitions in a raid 1 configuration with --perfer-write set on the HDD. I have this working correctly ...
- 229
2
votes
1
answer
4k
views
Understanding /proc/mdstat [U_] VS [_U]
My server is set up with raid1. A few nights ago sda fell out completely and data was corrupted. I replaced the drive, cloned the partition table and added the respective arrays. While adding sda3 (...
- 23
1
vote
0
answers
77
views
Is there a safe way to move a partition beneath a linux software RAID5 using mdadm?
Suppose, for example, that you have a RAID5 across multiple disks and you would like to retire the oldest of the disks and replace it with something from this decade. I know I can fail the partition ...
- 372
2
votes
1
answer
6k
views
Assembling an mdadm array with "possibly out of date" disks
I've recently moved house and have had some power problems after switching on my file server that's using a mdadm RAID5 set up. The file system I'm using is ext4.
It seems that at some point two (of ...
- 21
1
vote
0
answers
120
views
erased md0, md1 and can't recreate them
I previously had a working RAID 1 array. I think as a result of running grub-install /dev/sdb and grub-install /dev/sdc I somehow wiped my computer of md0 and md1.
I need to set them up again. When ...
- 218
3
votes
1
answer
2k
views
mdadm RAID 1 - spare drive after SATA cable change
Yesterday, my hosting provider changed a SATA cable of one of my HDDs. When my server came back up again, cat /proc/mdstat showed this:
Personalities : [raid1]
md124 : active raid1 sda1[0]
...
- 275