Re: With 4 disks should I go for RAID 5 or RAID 10 - Mailing list pgsql-performance

From david@lang.hm
Subject Re: With 4 disks should I go for RAID 5 or RAID 10
Date
Msg-id Pine.LNX.4.64.0712261452410.11785@asgard.lang.hm
Whole thread Raw
In response to Re: With 4 disks should I go for RAID 5 or RAID 10  (Florian Weimer <fw@deneb.enyo.de>)
Responses Re: With 4 disks should I go for RAID 5 or RAID 10
List 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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