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ASA with RAID 1, 5, 10

2 posts in General Discussion Last posting was on 2003-04-18 12:40:12.0Z
Doug Stone Posted on 2003-04-17 20:56:20.0Z
From: "Doug Stone" <nospamdstone@res-q.com>
Subject: ASA with RAID 1, 5, 10
Date: Thu, 17 Apr 2003 13:56:20 -0700
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One of our customers planning to purchase a server for ASA 8.
In a recent Sybase ASA seminar, the presenter mentioned a preference for one
RAID technology over others.
What is the preferred RAID for ASA and what drives the preference?

Thanks,
Doug


Robert Waywell Posted on 2003-04-18 12:40:12.0Z
From: "Robert Waywell" <rwaywell@ianywhere.com>
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Subject: Re: ASA with RAID 1, 5, 10
Date: Fri, 18 Apr 2003 08:40:12 -0400
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That was me.

The drivers for a preference are both data redundancy and performance.
With RAID 0 you get striping which spreads a single file across multiple
disks, but does not duplicate the same piece of data anywhere. This is great
for performance but does nothing for data redundancy. With RAID 1 you get
data mirroring which means each piece of data is written in 2 places. This
is great for data redundancy, it may help performance on read operations but
it slows down write operations. RAID 5 provides data striping at the byte
level and uses a parity disk to provide redundancy. Again this can improve
read performance but increases write costs. So the preferred configuration
is RAID 10 (or 0+1 ) which provides striping and mirroring. In this case the
striping helps to offset the cost of the mirroring. The cost of a RAID 10
system is that you need 2X as many disks as the final volume to accomodate
the mirroring.

By the way, this recommended configuration is not specific to ASA or
even to databases. The tradeoffs between redundancy and performance apply
equal to all file access.

--
-----------------------------------------------
Robert Waywell
Sybase Adaptive Server Anywhere Developer - Version 8
Sybase Certified Professional

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"Doug Stone" <nospamdstone@res-q.com> wrote in message
news:uxiMDQSBDHA.220@forums-1-dub...
>
> One of our customers planning to purchase a server for ASA 8.
> In a recent Sybase ASA seminar, the presenter mentioned a preference for
one
> RAID technology over others.
> What is the preferred RAID for ASA and what drives the preference?
>
> Thanks,
> Doug
>
>