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Old 05-06-2008, 11:54 AM   #1
tbeehler
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Registered: Aug 2003
Location: Washington State, USA
Distribution: Mainly RH 9.0
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Force /dev/sdX? to remain?


Hello all,

I have Ubuntu server 8.04, and I am running mdadm with 4 drives as well as the system drive. It looks like below

/dev/sda1 - 500gb Raid 5
/dev/sdb1 - 500gb Raid 5
/dev/sdc1 - 500gb Raid 5
/dev/sdd1 - 500gb Raid 5
/dev/sde1 - 120gb system drive

What happens is, is that when I remove a drive to test the raid array, the "drive letters" get all screwy.

So, for example, if I remove /dev/sda1 and reboot (testing failures)

it becomes:

/dev/sda1 - 500gb Raid 5
/dev/sdb1 - 500gb Raid 5
/dev/sdc1 - 500gb Raid 5
/dev/sdd1 - 120gb system drive

Which sends mdadm into a hissy fit and won't rebuild my array. When I put the drive back, it's like it sees it's previous drive failure and refuses to rebuild.

So my question is, is there a way to say /dev/sde1 is ALWAYS the 120gb system drive, regardless of drives that are present when the machine is up? Thanks for all your help in advance!
 
Old 05-08-2008, 05:04 PM   #2
TITiAN
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Registered: Mar 2008
Location: NRW, Germany
Distribution: Debian GNU/Linux with XFCE and packages from "testing"
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i think if you make the system drive "master", you can make it always be /dev/sda1. maybe it will need some bios settings on the hd management, too, but i'm not sure.
 
Old 05-08-2008, 05:29 PM   #3
tbeehler
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Registered: Aug 2003
Location: Washington State, USA
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Quote:
Originally Posted by TITiAN View Post
i think if you make the system drive "master", you can make it always be /dev/sda1. maybe it will need some bios settings on the hd management, too, but i'm not sure.

Thanks! I found my issue and resolved it today.

For some reason, mdadm wasn't seeing every drive properly. So, I did a mdadm --assemble --scan and it rebuilt my raid array. Then I did a mount -a and saw all the data. Once that was done, I put the "failed" drive back, and ran mdadm -a /dev/md0 /dev/sdb and rebuilt my array.

All of this was for testing because I didn't want to run into issues when I put it into production.

We're a small 40 person shop, and this is the first raid array that's going into a server (I've got GREAT backups. ), so I just wanted to be absolutely sure about my array before I made it live.

Thank you all for your help!
 
  


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