On Wed, 2006-03-15 at 17:11, Carl Wilhelm Soderstrom wrote:
> On 03/15 05:05 , Les Mikesell wrote:
> > That is probably the best approach, but note that if you boot
> > with grub you need to manually install it on the 2nd drive
> > of the raid (or both, depending on the OS distribution and version).
> > Also, many IDE disk failure modes will keep the machine from
> > booting at all until the drive is removed. I'm not sure if
> > that is a problem with SATA also or not.
>
> that's the main reason I avoid software RAID these days. I've seen disks
> fail in that way quite often; either crashing the box or just killing
> performance. (Bad drives sending constant bus resets, etc).
That's really only common on IDE though. I've had several
SCSI drive failures in software RAID1 sets that continued
to run and would reboot normally and where the drives were in
hot-swap cages I was able to change the drive and rebuild
without shutting down.
Worst case on IDE is that you have to open the case, remove
the cable from the bad drive and perhaps move it's mirror
into the master position. And you should know how to boot
from the install/rescue CD and reinstall grub anyway if
that happens to be necessary. It is still a lot better
than having to rebuild from backups and lose a day's work
and you can salvage data from any single drive or read it
in about any other machine. The 3ware cards are good and
I don't think I'd do raid5 in software but raid1 on scsi
is very usable and better than nothing on IDE as long as
the drives are on separate controllers.
--
Les Mikesell
[EMAIL PROTECTED]
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