[Klug-general] RAID OF DEATH!!!

[Karl Lattimer]

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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