[Klug-general] RAID OF DEATH!!!
Karl Lattimer
karl at nncc.info
Thu Dec 2 15:42:05 GMT 2004
Is there a meet on tonight?
On Thu, 2004-12-02 at 15:23 +0000, Stuart Buckland wrote:
> On Thu, 2004-12-02 at 15:10 +0000, Kevin Groves wrote:
> > > !! WARNING !! Do not unplug disks without removing them from the array
> > > first, and having your head switched on and in gear and knowing which
> > > physical disk it is you want to unplug from the array.
> >
> >
> > I'm not sure if it's a good thing to remove more than one from an array
> > at a time. I've tested my RAID a few times by just pulling the disks out
> > (these are IBM xSeries hotplug ones so not a problem to remove) and it's
> > all worked. OK most of my machines are mirrored so only one CAN come
> > out. But I seem to remember that, depending on the RAID level and number
> > of disks, more than one drive down at a time can be a problem.
> >
>
>
> With standard raid levels 0-5 unless you have multi-way mirrors or
> hotspare drives then removing more than one drive at a time will take
> the array down.
>
> In theory, if you run mirrored-stripes you could afford to lose more
> than one drive and remain operational. The total number you could lose
> would depend on how many drives are present in the array and their
> configuration.
>
> stu
>
>
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