Re: With 4 disks should I go for RAID 5 or RAID 10

From: Mark Mielke <mark(at)mark(dot)mielke(dot)cc>
To: Florian Weimer <fw(at)deneb(dot)enyo(dot)de>
Cc: david(at)lang(dot)hm, Fernando Hevia <fhevia(at)ip-tel(dot)com(dot)ar>, 'pgsql-performance' <pgsql-performance(at)postgresql(dot)org>
Subject: Re: With 4 disks should I go for RAID 5 or RAID 10
Date: 2007-12-26 21:40:40
Message-ID: 4772CA58.5050406@mark.mielke.cc
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Florian Weimer wrote:
>> seek/read/calculate/seek/write since the drive moves on after the
>> read), when you read you must read _all_ drives in the set to check
>> the data integrity.
>>
> I don't know of any RAID implementation that performs consistency
> checking on each read operation. 8-(
>

Dave had too much egg nog... :-)

Yep - checking consistency on read would eliminate the performance
benefits of RAID under any redundant configuration.

Cheers,
mark

--
Mark Mielke <mark(at)mielke(dot)cc>

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