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

From: david(at)lang(dot)hm
To: Florian Weimer <fw(at)deneb(dot)enyo(dot)de>
Cc: Fernando Hevia <fhevia(at)ip-tel(dot)com(dot)ar>, "'Mark Mielke'" <mark(at)mark(dot)mielke(dot)cc>, "'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 22:54:15
Message-ID: Pine.LNX.4.64.0712261452410.11785@asgard.lang.hm (view raw or flat)
Thread:
Lists: pgsql-performance
On Wed, 26 Dec 2007, 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-(

I could see a raid 1 array not doing consistancy checking (after all, it 
has no way of knowing what's right if it finds an error), but since raid 
5/6 can repair the data I would expect them to do the checking each time.

David Lang

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