Re: rebuilding a raid 1 array
- From: Aragorn <aragorn@xxxxxxxxxxxxxxxxxxx>
- Date: Fri, 14 Mar 2008 17:29:40 +0100
Ivan wrote:
Hi all,
I need some advise in regards to the best way of rebuilding a raid 1
array.
I'm going to presume you're talking of a hardware RAID here... :-)
I have a computer located in a different state, and manage it
remotely. One of the hard drives failed, and I shipped over a new drive
over (same as the ones in the server) for someone to replace the old,
failed hard drive.
When this was done the server failed to start up.
I'm not sure what the message it gave was (as I was not near the
machine and could not afford another re-boot at the time), and the
person replacing the hard drives simply put on the previous drive (The
one that was failing), and started the server up again.
Upon startup, the server gives the error "Please back up your data,
hard disk failure is imminent."
That would be logical if one of the hard disks is failing, and considering
that this person put the failing drive back into the system, that's what
you get... ;-)
Pressing F1 would start the machine up.
So we know now that it is indeed a hardware RAID. :-)
What would be the best way of putting a new hard drive on the server
without having to get other people to work on it?
Putting it in yourself. You could also wait for the fairies to do it, but I
wouldn't stake my chances on that. :p
Will I be able to build a hard drive here, ship it over and get them
to replace it?
No, because a hard disk has to be initialized by the RAID controller it will
be used on, and after the disk is initialized, the controller will then
rebuild the array, either automatically or via a firmware set-up utility
prior to the boot process, or a software utility when the system is already
up and running. A RAID rebuild can take a long time, and this may disrupt
or severely slow down other activities on the running machine.
My advice would be that if you have a computer in a different state, it
should have not only the necessary disks for the actual mirroring, but it
should also have at least one spare, be it a hot spare or a standby spare.
The difference between the latter only pertains to speed, as a hot spare is
already spun up while a standby spare is kept spun down.
Just my two cents... ;-)
--
Aragorn
(registered GNU/Linux user #223157)
.
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