Hello Everyone,
First time CentOS poster :) I have CentOS 4 installed on the head node of a
Sun Gridengine cluster set up in a RAID. The head node has four hard
drives, and I assume that drives 1 and 2 are in a raid and then drives 3 and
4 are in another raid. I was trying to expand the OS partition on drive 1
because it was full. I took drive 1 out, put it in my Fedora 8 box as a
secondary drive, booted up into Fedora, and saw it had the partition
structure:
/ 8GB
/var 4GB
/swap 1GB
and an "unknown" partition 101.4GB
I did a cp -rfa on the / and /var files for a backup (I know, not the best
way). Restarted my Fedora into Windows to take a look at it using Paragon
Partition Manger. Restarted into Fedora and using gparted, formatted the
"unknown" partition as ext3 - I think that is where I made my fatal mistake
- and moved the /swap to the middle of the drive, moved the /var to the
middle and expanded to 10GB, and then expanded / to about 50GB to fill up
the rest.
I had also took drive 2 out of the head node and into my Fedora, and saw it
had the partition structure:
/swap 15GB
and an "unknown" partition 101.4GB
Ok, now when I put everything back into the head node, and reboot, the BIOS
sees all four drives, and from what I can tell, recognizes the first raid
(of drives 3 and 4), but says it can only find one disk for the second raid
(drives 1 and 2). I can't find any way around this.
Looking at my /etc/raidtab file:
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
nr-spare-disks 0
persistent-superblock 1
device /dev/sdc1
raid-disk 0
device /dev/sdd1
raid-disk 1
raiddev /dev/md1
raid-level 0
nr-raid-disks 2
persistent-superblock 1
chunk-size 4
device /dev/sda4
raid-disk 0
device /dev/sdb2
raid-disk 1
It says it can bring up md0 ok, but not md1. Right now, I am going to try
to restore the "unknown" partition that I deleted from drive 1 using the
"unknown" partition from drive 2.
Any ideas on how to get myself out of this mess? I feel like I really
messed it up good. This is a server for our work, and we have a couple
years worth of data on it, so I would really like to fix it rather than
reinstall.
Thank you greatly for any help!
Jeff Sadino
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