The best reason I can think of for 2-disk RAID5 is upgrading a 1-disk setup
to 3-disk:
#1 - RAID5 the two new disks (3-disk setup -- 2 running)
#2 - Copy the old disk to the new RAID5
#3 - raidhotadd the old disk
I've done this twice now but had to use a tape drive to backup first. Mind
you, I already had a backup but, it covered ALL my disks and I didn't want
to wait for 22G of tape to slosh through to restore 8G -- If this could be
done without needing a 4th disk or tape backup it would've taken only about
30 minutes instead of 5 hours.
___________________________________
Michael D. Black Principal Engineer
[EMAIL PROTECTED] 407-676-2923,x203
http://www.csi.cc Computer Science Innovations
http://www.csi.cc/~mike My home page
FAX 407-676-2355
----- Original Message -----
From: Ingo Molnar <[EMAIL PROTECTED]>
To: Martin Bene <[EMAIL PROTECTED]>
Cc: Piete Brooks <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>
Sent: Friday, March 19, 1999 8:32 AM
Subject: Re: Single disk mirror + spare causes lockup :-(
On Fri, 19 Mar 1999, Martin Bene wrote:
> Yep, it definitely should. Guess I'll write a patch to catch some of the
> possible setup errors (mirror with 1 disk, raid4/5 with two disks (?), any
> others?).
i've fixed the RAID1 problem already in my tree, and RAID4-5 _is_ possible
with 2 disks, it just doesnt make much sense normally.
-- mingo
