Both sides of Mirrored Drives showing as separate drives
- From: "Jim Watts" <j.watts@xxxxxxxxxxxxxx>
- Date: Mon, 25 Jul 2005 14:55:13 +0100
Hi,
I have a number of servers, all based on DELL hardware, that are showing a
very odd problem with their disk subsystem.
Basically, these servers have the OS on Mirrored/RAID1 disks, and BOTH disks
are showing in My Computer/Explorer. For example, one server shows C: and F:
both pointing to the same disk (same files, freespace, label etc). Looking
at the Disk Management MMC, it correctly shows the mirror, shows that both
halfs have C: as the drive letter, and actually shows only the single drives
in the top half of the Windows, rather than the two duplicate drives the My
Computer shows.
To make matters worse, we appear to have seen at least one of these servers
reboot and start up with the %SystemDrive% set to the other half of the
mirror, F: instead of C:. This obviously causes all sorts of problems. A
reboot fixed the problem, and from there it actually looks like they swap
which drive is considered the systemdrive on each reboot.
As i said, these servers are all DELL servers, but there are differences.
Some use software mirroring, some use hardware mirroring via DELL PERC3/DI
RAID controllers. The only consistent thing (at the moment) is that all the
servers showing this problem are running Windows2000 Server SP4. Has anybody
else seen this, and know what to do to fix it? Could it have been causd by a
recent update, as these servers have certainly run correctly in the past. I
cant beleive that this is something that can be fixed by breaking and
redoing the mirrors as, as i said, some of these use hardware RAID and so
you dont even get the option to do this!
Many thanks for you help,
Jim Watts
--
Jim Watts,
Technology Consultant
Information Systems Services
University of Southampton
.
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