[CentOS] Duplicate PV on HW RAID?

Ross S. W. Walker RWalker at medallion.com
Mon Jul 28 21:57:36 UTC 2008

D Steward wrote:
> > Re-install with software RAID1.
> > 
> > RAID1 is cheap as far as CPU/IO time is concerned so it works
> > well software wise, and you get email alerts if it gets
> > degraded!
> I agree with you re. CPU load, but what about hot-swap and auto
> rebuilding of arrays? Does software RAID give you this?

Hot swap, yes, if the hardware supports hot swap, auto rebuild,
yes, if you defined a hot spare beforehand, otherwise you have
to add the replacement to the array with the --add option.

That is how the hardware controllers do it. They don't auto
assume that a new drive inserted is a spare for the one
removed, but if you defined a hot spare then they will
auto-rebuild off that just like software RAID will.


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