Re: hot spare disk

[Kirk Goins <kgoins@xxxxxxxxxxx>]

Greg Wenzloff wrote:
> Hi List,
>
> We have a new 525 still in the box and am trying to coordinate the
> install.   Business partner (Sirious) says that I can not have a hot
> spare disk unless using RAID 6.
>
> I'm convinced that I can have that using RAID 5.    System has V5R4M5
> and a 5727 controller with 6 drives.
> I would like one of them to be a hot spare.
>
> Who is correct?
>
> Thanks,
> Greg
>   
RAID6 isn't Raid5 with Hot Spare. RAID6 uses 2 drives woeth of parity if 
you will allowing you to loose '2' drives in the same set and still run 
as you know. Raid5 with Hot Spare can only loose a Single Drive, BUT it 
will automagically swap in the the SPARE and start the rebuild. This 
reduces the unprotected time. Raid6 does this 1 better, sin ceth eset is 
still protected even if 1 drive fails.