Re: RAID controller - RAID performance

Ross James ( (no email) )
Sun, 09 Aug 1998 16:03:54 +1000

Most RAID controllers will about halv the performance of a single drive =
system (despite all the hype to the contrary). If RAID is necessary a =
multi channel (3 is better than 2) controller is best. For NT a 1/2-Gb =
RAID 5 partition for booting and the rest as RAID-3 will give you optimum =
performance in almost all situations.

Ross James

>>> =22Juergen Weiss=22 <> 07/06 4:33 AM >>>
I want to upgrade my production server with a raid-system. After reading
several docus I am not quite sure which solution I should use:

RAID-controller with 1 SCSI port and 3 harddiscs with 4,3 Gb each setup as =
RAID 5 system. Then creating two partitions 1 Gb for system 7 Gb for data
and applications.

RAID-controller with 3 SCSI ports and 2 harddiscs with 2 Gb setup as a
mirror (raid 1) for system and 3 harddiscs as raid 5 like mentioned above.
This should give better performance because there are 3 SCSI channels and
also reduced head-movements because the swap-file is not located on the
discs for the applications.

I am wondering if I need the extra performance of solution 2? My server
(Dual PPRO 200, 128 MB) is not much loaded, but running most of the
applications (IIS 4.0 www and ftp, Mailserver, DNS, Radius with access DB,
fileserver for internal use). I do not have performance problems right now
with my single 4,3 Gb disc, but want to have good fault tolarance.

Also can someone recommend a good and reliable controller?

I would appriciate any comments or ideas.

Juergen Weiss

Weiss Internet Services
D-74862 B i n a u
Tel. +49 6263 45036
Fax +49 6263 45037