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Re: databases and RAID ...

From: Bill Cunningham <billc(at)ballydev(dot)com>
To: Peter Eisentraut <peter_e(at)gmx(dot)net>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>,pgsql-admin <pgsql-admin(at)postgresql(dot)org>
Subject: Re: databases and RAID ...
Date: 2002-05-26 15:00:50
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Lists: pgsql-admin
Peter Eisentraut wrote:

>Tom Lane writes:
>>Is there any rhyme or reason to the various "RAID n" designations?
>>Or were they just invented on the spur of the moment?
>The paper that introduced the term RAID used a numerical classification
>for the various schemes.  (So I guess the answer is yes.)  The traditional
>levels are:
>0  Nonredundant
>1  Mirrored
>2  Memory-style ECC
>3  Bit-interleaved parity
>4  Block-interleaved parity
>5  Block-interleaved distributed parity
>[Hennessy & Patterson]
>There are also other levels.  One poster talked about RAID 10 which
>appears to be a mirrored RAID 5.
No Raid 10 is Raid 1 + 0 its strong points are faster writes but slower 

- Bill

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