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Article #409

RAID 5 vs duplexing

#409
From: Tom Kustner
Date: Fri, 10 May 1996 00:00
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I have done some research on this and drawn some conclusions
(corrections welcome), but still have a few questions:

Duplexing

- Initially cheaper than RAID 5, but eventually more expensive (twice
the drives)
- Reads are faster because there are two disks to read from.
- Hot-swappable capability exists.
- Best if you care about uptime and performance

RAID 5

- See above comments on duplexing.  Cheaper for sites with lots of
drives.
- Dependent on one controller.
- Best if you care about cost.
- Proprietary (?)

Questions:

Are RAID 5 controllers slower, the same, or faster than, say, a normal
Fast Wide SCSI-2 controller?

Which one does writes faster, RAID 5 or duplexing?

What is preferrable, the "software" protection of duplexing as done by
NetWare, or the "hardware" protection as done by RAID 5, or are they
the same?

Is RAID 5 harder to manage than duplexing?

Are there any disadvantages to RAID 5 I haven't listed?

We are a Compaq environment and currently duplexing our current
server.  These questions are more for a new server we may be ordering
from Compaq (Proliant 1500).  Any comments on Compaq's RAID  solutions
or on their SmartArray controllers are welcome.  Thanks for your help.
----------------------------------------------------------------------------
Tom Kustner                   Emjay Corporation    
System/LAN Administrator      725 W. Glendale Ave.
Email: emjay@execpc.com       Glendale, WI  53209-6509  USA
Phone: (414) 961-0650         
Fax #: (414) 961-1649         Any opinions are mine and not Emjay's.
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From: emjay@execpc.com (Tom Kustner)
Subject: RAID 5 vs duplexing
Date: 1996/05/10
Message-ID: <31938d64.16703900@news.execpc.com>
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organization: Emjay Corporation
newsgroups: comp.os.netware.misc,bit.listserv.novell