Hi everyone,
I'm running redhat es 5 with several raid 1 partitions setup. It looks like /dev/sdb is getting ready to fail. I noticed the following in the logwatch report:
/dev/sdb - 29 Time(s)
1 offline uncorrectable sectors detected
So, in order to correct the pending failed drive, I marked each /dev/sdbx partition that was partitioning in a raid1 as failed with mdadm, and then removed the dev/sdbx with madam. So I was running the os from /dev/sda only. So far so good.
I then took the box down and unplugged the device that I believed was /dev/sdb, however the box wouldn't boot. It just sat at the grub prompt. So, I thought, maybe the box is seeing the other drive as /dev/sdb. So, I turned the box back off, plugged in the previous drive, unplugged the other drive, and the box wouldn't boot. I got to the grub splash screen, however the box just kept resetting itself. So, I plugged that drive back in, and the box booted up fine. So, I'm now working with what I believe to be a good drive and a soon to be failed drive. So, a few questions here. 1. How do I identify which hard drive is /dev/sda and which is /dev/sdb? 2. Why wasn't I able to boot with a single drive (assuming that at least 1 of them is good)? 3. How do I go about replacing the bad drive? Thanks for your help. Below is a print out of /dev/mdstat before failing and removing /dev/sdb from the mirrors (all raid partitions were setup during the install of the operating syst
em)
md0 : active raid1 sdb1[1] sda1[0]
513984 blocks [2/2] [UU]
md5 : active raid1 sdb2[1] sda2[0]
204796544 blocks [2/2] [UU]
md1 : active raid1 sdb5[1] sda5[0]
3068288 blocks [2/2] [UU]
md4 : active raid1 sdb6[1] sda6[0]
2048192 blocks [2/2] [UU]
md3 : active raid1 sdb7[1] sda7[0]
2048192 blocks [2/2] [UU]
md2 : active raid1 sdb3[1] sda3[0]
10241344 blocks [2/2] [UU]
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/md2 9.5G 2.2G 6.9G 24% /
/dev/md0 487M 19M 443M 5% /boot
tmpfs 755M 0 755M 0% /dev/shm
/dev/md5 190G 1.4G 179G 1% /opt/zimbra
/dev/md3 1.9G 81M 1.8G 5% /tmp
/dev/md4 1.9G 152M 1.7G 9% /var
--
Aaron Bliss
Systems Administrator
SUNY Brockport
(585) 395-2417
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