RE: hot spare disk

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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