This post is more than 5 years old
3 Posts
0
1808
March 12th, 2015 08:00
RAID 1 and/or 10
Hello, I was put in charge of two servers which utilize RAID but I am not too knowledgeable about RAID. Mainly I'm just looking for peace of mind.
From what I understand, RAID 1 and 10 have fault tolerance and a disk can be replaced should it have issues. We have a Dell Poweredge 1800 with hardware RAID1 and another Dell server running software RAID10 via CentOS.
Thanks in advance.
1) My main concern right now is this: If a disk fails and I replace it, does it automatically know which disk is the new one? I wouldn't want it to overwrite the existing disk with the empty new one and end up with nothing. This server doesn't have hot-swap, so I'll have no choice but to power it down if/when I replace the drive.
2) If my RAID card fails and I have to get a new one, does it have to be an identical model? Will it auto-detect the drives and have everything work automatically?
ejn63
9 Legend
•
87.5K Posts
0
March 12th, 2015 14:00
1. The controller will indicate which drive has failed.
2. You'd need an identical controller.
Bear in mind though, RAID is redundant -- it is NOT backup. For a case where both drives fail (or become corrupt), or the RAID controller fails. a backup -- kept separate from the system -- is absolutely needed.
Do not rely on RAID of ANY type for backup.