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Old 07-06-2011, 02:42 AM   #1
Registered: Mar 2011
Posts: 38

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Hi....everybody, I am working as as Linux Admin. I have configured RAID1 with below partitions
1.sda & sdb
HD-Partitions RAID-Devices Size Mountpoint
sda1-sdb1-------- /dev/md0-------- 500MB---------- /boot
sda2-sdb2-------- /dev/md1-------- 50GB----------- /
sda3-sdb3-------- /dev/md2-------- 8GB----------- Swap
sda5-sdb5-------- /dev/md3-------- 500GB------- /backup
sda6-sdb6-------- /dev/md4-------- 300GB---------/data1

2.sdc & sdd
sdc1-sdd1-------- /dev/md5-------- 1000GB--------/repo

I am using CentOS5.5 & md0, md1, md2 was configured during the installation itself. I checked only single-single hdd(sda-sdb) it is booting fine, So I ensured that the system still will be able to boot from another hdd even any hdd(sda or sdb) failure. Everything is working fine. but the problem is whenever I am copying data to md device, raid is showing one of the partition is fail. This is only for sdb like sdb5 or sdb6. This happens only then when I am copying some large data(10GB-50GB). Always I am rebuilding it. After rebulding, it will be working fine. I swapped sdd with sdb & sdb with sdd. After readding those hdd it is working fine. But the problem is still continuing, i.e if I try to copy, the partition in sdb would be failed. This is not happening with md5(sdc1&sdd1). I don't know what may be the problem. But it is very urgent & I hope someone will definitely help me about this.

Old 07-06-2011, 08:58 AM   #2
Registered: Sep 2008
Distribution: Fedora
Posts: 129

Rep: Reputation: 22
Do you have anything showing up in the log files about mdadm or general disc problems? I haven't used CentOS but fedora *should* have the same disc utility program, try checking the SMART reporting on all the drives. If you see any bad sectors or other problems in the report you'll want to replace the drive as it's going to fail (soon!). If that doesn't help, I hope someone else has some more tips for ya.
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