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Obsolete Releases => SME Server 7.x => Topic started by: jameswilson on July 06, 2008, 11:45:39 PM

Title: degraded raid 5 array
Post by: jameswilson on July 06, 2008, 11:45:39 PM
Hi all.
Have a little problem caused by stupid me.
Basically have a 4400 x2 with 5 x 500Gb seagate sata's in it.
These have individual hard disk coolers. IN moving this server (its my home storage server, media etc) i unplugged the fans for a bit to check temps, in doing so i disconnected a drive. As the system had a hat spare it rebuilt and i thought nothing of it knowing id plug it back in soon.
Well today i did. It said it now had an used drive to be added... did i want to etc, i said yes.

Now i have a degraded array with a funny hd setup.

I definetly have 5 hard drives but the system (fdisk -l) lists only 4

but anyway.
(http://www.securitywarehouse.co.uk/bigdrivemdadmerror.jpg)

any suggestions. I have tried adding sdc2 into the array but i get

Quote
[root@bigdrive ~]# mdadm /dev/md2 -a /dev/sdc2
mdadm: ARRAY line /dev/md2 has no identity information.
mdadm: ARRAY line /dev/md1 has no identity information.
mdadm: Cannot open /dev/sdc2: Device or resource busy

thanks

Title: Re: degraded raid 5 array
Post by: sal1504 on July 08, 2008, 12:21:48 AM
james

I had a similiar problem and found this in the How To's  - http://wiki.contribs.org/Raid. I followed the instructions and it resolved my raid problem. Go to the section that is titled  Resynchronising a Failed RAID. Hope it works for you.

Sal

Title: Re: degraded raid 5 array
Post by: jameswilson on July 12, 2008, 12:58:37 AM
unfortunatly not but i have been trying

dd if=/dev/zero of=/dev/sdc bs=1M

to wipe the hard disk and am hoping that will allow it back into the array...

fingers crossed as that command on a 500 Gb hard disk seems to take a while!
Title: Re: degraded raid 5 array
Post by: jameswilson on July 12, 2008, 11:28:36 AM
nope unfortunatly that hasnt done it, any ideas guys?
Title: Re: degraded raid 5 array
Post by: jameswilson on July 12, 2008, 07:13:29 PM
i manually added sdc to the md2 array, but i still have an array problem on md1, i assume i need to create some sort of partition?

ill add all these drives are identical. But im still missing a drive, i have checked all the drives are powered and have sata, and im only showing sda - sdd, no sde?