RSYNC Fedora
leam
leam at reuel.net
Wed Nov 26 16:19:55 UTC 2003
> >>>>> "Brian" == Brian Fahrlander <Brian at Fahrlander.net> writes:
>
> Brian> I once asked a woman that worked at Veritas in tech
support.
> Brian> She said that on all these RAID arrays, loss of a second disk
is
> Brian> _ALWAYS_ fatal. I was stunned.
>
> Yup, she was right.
>
> Brian> I mean, a 30 drive array...and if the second drive goes
out, the
> Brian> entire thing is toast?
>
> If you choose to set up a single array with 30 drives in it, that is
correct.
>
> Brian> There gets to be a point where this is a problem. In 1-5
disk
> Brian> arrays, what are the chances of a second drive going out?
Right:
> Brian> almost nil.
>
> Brian> But when you have 50 drives in a special bay, the chances
of a
> Brian> second drive going out while you locate a vendor, find out it's
been
> Brian> obsoleted since it was installed, order a new part....
>
> Exactly, so as the old joke goes when the guy tells his doctor it
hurts
> when he moves his arm, then don't do that! :-)
>
> Instead, keep the number of drives in any given array low. If you
need
> more space, look at getting bigger drives. If you need even more
space,
> consider "stacking" arrays (make a RAID 0 array out of as many 3-drive
RAID
> 5 arrays as you need to reach your storage requirements, for
example). By
> doing this you still are exposed to the risk of multiple drives
failing at
> any given time, but you reduce the exposure of any one array losing
more
> than one drive.
>
> Ed
> --
> Ed Bailey Red Hat, Inc. http://www.redhat.com/
Depending on your RAID software you might also include a spare disk or
two in the diskgroup. A disk fails and you replace it. You can have
Veritas scream to syslog if a disk dies and you can schedule
replacement.
Not sure if any of the hardware raid solutions let you have spare disks,
but seems possible.
ciao!
leam
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