[rhn-users] Raid repair

[Nick Nobbe]

Wish I could throw some light on this, but I've heard numerous tales of woe
connected with Raid 5 failures, and failure to repair, on IIS servers (with
just too much traffic for the poor thing), Exchange servers, and also in the
Linux world. If you're doing databases, Raid 10 is recommended for fast
writes and reads.

At least you got the data back.

Nick
----- Original Message ----- 
From: "LONNIE TROTTER" <ltrotter at ajusd.org>
To: <rhn-users at redhat.com>
Sent: Tuesday, March 30, 2004 12:17 PM
Subject: [rhn-users] Raid repair


> Has anyone experienced this.
>
>    We had a server setup with physical space for six scsi hard drives.
> The first three were constructed as a RAID1 array while the last three
> were constructed as a RAID5 array. One of the drives in the RAID5 array
> failed and was not repairable. The failed drive was removed and a
> replacement drive put in its place, we booted into linux rescue and
> fdsik'd the drive creating a partition table exactly the same as the
> drive that had failed. Went to boot back in to Enterprise to raidhotadd
> the replacement harddrive to the RAID5 array, but enterprise would not
> let us do that. The RAID5 array would not start because there were only
> two drives available, if the broken drive was placed back in the raid
> would come up in degraded mode. The problem here is that we had no
> physical space to have both the failed drive and the replacement drive in
> at the same time. This meant that the raid would not start, preventing us
> from raidhotadding the replacement drive. As a result we copied the data
> off of the raid while it was in degraded mode, put the replacement drive
> in and rebuilt the raid array, then copied the data back onto it. This
> was quite time consuming as the data we were moving around was around 25
> gigabytes.
>
> Lonnie Trotter
> Network Administrator
> Apache Junction Unified School District
> Phone: 480-982-1110 Ext. 2050
>
>
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