a utility to administrate Linux Software RAID devices

learn more… | top users | synonyms

3
votes
2answers
13k views

Improving mdadm RAID-6 write speed

I have a mdadm RAID-6 in my home server of 5x1Tb WD Green HDDs. Read speed is more than enough - 268 Mb/s in dd. But write speed is just 37.1 Mb/s. (Both tested via dd on 48Gb file, RAM size is 1Gb, ...
3
votes
1answer
1k views

How do I unmark a “failed” md device?

In an effort to clean up from a software bug in md, I marked half of a RAID (/dev/sda1 and /dev/sdb1 in RAID1) as faulty using: mdadm /dev/md2 --fail /dev/sdb1 mdadm /dev/md2 --remove /dev/sdb1 But ...
2
votes
1answer
11k views

How to access MD RAID via Live CD?

We are currently trying to run access the data on a server running a HP Ml110 G5 SATA raid controller, using the latest Ubuntu Live CD. We need to delete a few files to let the server boot into ...
5
votes
2answers
5k views

Rebuild mdadm Raid5 after OS hard drive died

I have an ubuntu desktop 10.4 "server" with 5 hardrives. 1 of the hardrives had 3 OS's on it (Windows Vista, Windows XP, and Ubuntu 10.4). I primarily used the ubuntu OS so that I could use mdadm and ...
1
vote
1answer
965 views

Mdadm seems to have completely forgotten about a device and shrunk my array

After a bit of investigating of a problem I've just encountered, it looks like mdadm has completely forgotten about a new device I'd added to an array. I recently added a new device to the array which ...
1
vote
1answer
435 views

Does rebuilding a RAID change data?

I've just restarted my computer which was building up a RAID5 for the first time. This of course meant that my computer had to rebuild the whole thing from ground up. Before I restarted the computer ...
3
votes
1answer
512 views

Is it normal that mdadm has to start from scratch when I restart my computer while it's rebuilding the third disk?

I've installed a RAID5 using mdadm yesterday. Since then it has been rebuilding. I just restarted my computer and it started rebuilding the RAID from scratch. (Had 60% before.) Is this normal or are ...
13
votes
4answers
35k views

How do I align my partition table properly?

I am in the process of building my first RAID5 array. I've used mdadm to create the following set up: root@bondigas:~# mdadm --detail /dev/md1 /dev/md1: Version : 00.90 Creation Time : Wed ...