Robert,

Regarding Raid5...

Raid5 as I understand it has stronger read performance than write
performance.  Some of that may be negated by caching on either your
software-based or hardware controller based Raid5.  So that write hit may or
may not have an effect on you.

The write performance hit would be most apparent if you have full NetBackup
logging enabled on your servers.  Especially if they are set to verbose. So
keep that in mind.

Regards,

Doug Braden
VERITAS Impact Team

-----Original Message-----
From: Robert Johannes [mailto:ROBERT_JOHANNES AT udlp DOT com]
Sent: Friday, November 02, 2001 9:40 AM
To: nb
Subject: [Veritas-bu] Raid5 or mirrored?


I'm setting up a file system for /usr/openv using volume manager with
four disks, and I'm wondering if it would be better to make it a raid5
system, or a concatenated mirror.  If I use mirroring, then my disk
space is limited to that of the two disks, but with raid5, I get an
extra disk space.  For performance reasons, what would be the best
layout of disks?

thanks
robert
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