3
votes
0answers
39 views

RAID-1 mirror has become a single hard disk

I have an HP N40L microserver, with 2 identical drives, I used the system to hardware-RAID them as a mirror. I then installed mint on the system about a year ago. This has been running perfectly, ...
7
votes
3answers
441 views

Difference between UUID from blkid and mdadm?

Can someone explain the difference between the UUID's reported by blkid and mdadm? On one of our CentOS systems, for example: [root@server ~]# blkid | grep /dev/md1 /dev/md1: ...
1
vote
0answers
17 views

Linux software raid assembled “itself” with failed drive. Why?

I have two raid1 arrays: md3 (sda3 + sdb3) and md5 (sda5 + sdb5). I deliberately failed the sdb disks because I wanted to change the partition table: # mdadm /dev/md3 --fail /dev/sdb3 # mdadm ...
0
votes
2answers
80 views

Gentoo XEN host + EFI + MDADM + IMSM RAID5

I have a workstation with a working Gentoo setup. It uses IMSM FakeRAID (level 5) with 4 disks. Booting done without bootloader using Linux kernel EFI STUB. System works fine. Now I need to setup XEN ...
5
votes
2answers
341 views

RAID 5 with 4 disks fails to operate with one failed disk?

I found a question about mdadm spare disks which almost answers my question, but it isn't clear to me what is happening. We have a RAID5 set up with 4 disks - and all are labeled in normal operation ...
4
votes
1answer
114 views

Reusing older raid discs

I have a software RAID5 array (Linux md) on 4 disks; the OS is OpenSUSE 12.3. Recently I replaced a disc with a larger one (fail disc, remove it, add new disc). The capacity of the array has not yet ...
3
votes
3answers
653 views

How to safely replace a not-yet-failed disk in a Linux RAID5 array?

I have a software RAID5 array (Linux md) on 4 disks. I would like to replace one of the disks with a new one, without putting the array in a degraded state, and if possible, online. How would that ...
3
votes
2answers
3k views

Ubuntu: How do the md devices get assembled at bootup?

How do the md devices get assembled at bootup in Ubuntu? Is /etc/mdadm/mdadm.conf truly the relevant factor here? My mdadm.conf is sound and I checked that while I was in the rescue CD environment. ...
2
votes
0answers
330 views

Disable RAID auto detect at runtime

In Linux, I'm partitioning two disks for RAID1 with fdisk. The first disk partitioning succedes, but the second fail because the raid starts automatically and occupy also the second disk (why? it ...
2
votes
1answer
184 views

Can MD cope with a badblock list?

I have a MD drive set in RAID6 configuration with LVM2 on top. One of my drives was faulted last night due to bad blocks. Now apart from the fact that I am aware I should physically replace the drive, ...
2
votes
1answer
679 views

convert /dev/md0 to /dev/sda1

I used a Software-RAID I and want to access the data without RAID now. After mdadm --fail /dev/md0 /dev/sda1 mdadm --remove /dev/md0 /dev/sda1 I tried mount -t ext4 /dev/sda1 /mnt but dmesg ...
2
votes
1answer
431 views

Ubuntu Software Raid5 - /dev devices changed, will mdadm raid break

I had a major server failure. The OS is fine and back up and running. Before I plug my raid drives back in and try and mount it I need to ask this simple question. The drives that originally mapped ...
2
votes
1answer
356 views

Recover MDADM Raid 5 in LVM with badblocks

I'm pretty sure I'm dealing with at stuffed RAID 5 array. Two of the drives were listed as failed in /proc/mdstat and mdadmdetails: 0 0 8 33 0 active sync /dev/sdc1 ...
3
votes
3answers
2k views

RAID5 recovery trying with “mdadm --create … missing”

First how I got in this situation: I had an RAID5 array with disks each 2TB (external USB-disks), I then wanted to create a larger encrypted array. Therefore I got 2 additional disks (also 2 TB each) ...
1
vote
1answer
223 views

Issue with degraded raid5 after power outage

I have a raid5 that consists of 8 disks. After a power outage mdadm tells me that the raid is degraded. Here is the output: /dev/md0: Version : 0.90 Creation Time : Sat Jul 10 09:08:28 2010 ...
2
votes
0answers
291 views

Software raid checksumming slow

On my new 24 disk array I get 900 MB/s of raw read or write using dd to all the disks. When I set the disks up as a 24 disk RAID6 I get 400 MB/s write and 600 MB/s read. It seems to be due to ...
6
votes
1answer
2k views

mdadm Raid5 gives spares missing events

I succesfully builded up a raid5 array on debian testing (Wheezy). As the manpages and further tell, the array would be created as an out of sync array with just a new spare injected to be repaired. ...
6
votes
2answers
2k views

Will the system make sure that mdadm is sync-ed before completing a reboot?

This is a follow up to my crazy mdadm problem. I'm trying to figure out what might have caused sda to get out of sync in the first place. The only thing I can think of is that I had just run a bunch ...
2
votes
1answer
356 views

Drive was unable to assemble into the array

I ran mdadm -A /dev/md0 /dev/sda1 /dev/sdb1 Only /dev/sdb1 was loaded into the array though. I have a few more arrays on the same two drives too. Each time the partition on sda failed. dmesg told ...