Hi all, this is the first time i have dealt with a linux software raid build up, and it seemed to go fine, im using centos 5.2 with 2x500gb sata drives, and a cheap 2 port sata card (silicon image)

I built the machine yesterday afternoon, and turned it off last night using /sbin/shutdown -h, moved the machine and rebooted it this morning.

I started doing some research on how to check the raid to see if it is fail safe, and just run the command mdadm --detail /dev/md1 and got returned with this result

[root@server ~]# mdadm --detail /dev/md1 /dev/md1:
Version : 00.90.03
Creation Time : Mon Jul 7 04:46:25 2008
Raid Level : raid1
Array Size : 488279488 (465.66 GiB 500.00 GB)
Used Dev Size : 488279488 (465.66 GiB 500.00 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 1
Persistence : Superblock is persistent

Update Time : Mon Jul 7 19:55:02 2008
State : active, resyncing
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

Rebuild Status : 15% complete

UUID : 8dabb36d:49d3cec7:3a5da975:4fb1f2c7
Events : 0.9

Number Major Minor RaidDevice State
0 8 2 0 active sync /dev/sda2
1 8 18 1 active sync /dev/sdb2

Any reason why it would be rebuilding so quickly? What else can i do to investigate this further to see if one of the drives is faulty? or what is going on?

any help is much appreciated

I'm not sure if I understand your question? Are you pondering why it's rebuilding so quickly or slowly? From the story, sounds to me as if you built machine and turned it off before it finished syncing, so now it's still rebuilding. The initial build and rebuilds of a 500GB disk can take some time.

sorry for the confusion, i was pondering why it decided to rebuild again after an initial install, the answer is as you described.

i think you are correct, i have most likely turned it off before it had finished rebuilding from the original install

sorry again, and thanks for helping out