RE: hot spare disk

["Wilt, Charles" <WiltC@xxxxxxxxxx>]

I don't think so Waldon.

The 2nd parity drive in a RAID 6 array isn't a "hot spare".  It's part of the array.

A "hot spare" drive is simply an empty drive already installed in the machine and ready to be used
automatically.

You could have a machine with a RAID5 array and a RAID6 array, along with a single hot-spare drive
that could be used by either array.


Charles Wilt 
Software Engineer
CINTAS Corporation - IT 92B
513.701.1307
wiltc@xxxxxxxxxx


> -----Original Message-----
> From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-
> bounces@xxxxxxxxxxxx] On Behalf Of Walden H. Leverich
> Sent: Tuesday, April 29, 2008 8:48 AM
> To: Midrange Systems Technical Discussion
> Subject: RE: hot spare disk
>
> > 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.
>
> Yes, but therefore the "spare" drive is "hot". That is, it's up and
> running the second you lose the first one (ok, it was always running,
> but the point is there is zero-unprotected time.)
>
> In the case of RAID5 with a spare, it's "warm" at best. There is
> unprotected time as the array is rebuilt.
>
> -Walden
>
> --
> Walden H Leverich III
> Tech Software
> (516) 627-3800 x3051
> WaldenL@xxxxxxxxxxxxxxx
> http://www.TechSoftInc.com
>
> Quiquid latine dictum sit altum viditur.
> (Whatever is said in Latin seems profound.)


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