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Re: FORGOT TO CONFIGURE RAID! DELL POWEREDGE 2950

From: Hannes Dorbath <light(at)theendofthetunnel(dot)de>
To: Gregory Stark <stark(at)enterprisedb(dot)com>
Subject: Re: FORGOT TO CONFIGURE RAID! DELL POWEREDGE 2950
Date: 2007-07-14 10:19:51
Message-ID: 4698A347.2020401@theendofthetunnel.de (view raw or flat)
Thread:
Lists: pgsql-performance
Gregory Stark wrote:
>> From the DELL site it seems this `PERC 5/i' on board controller
>> (assuming that's what you have) doesn't even have a BBU. If you don't
>> plan to post here in a few weeks again about data corruption, go out and
>> shop a serious controller.
> 
> This is a bit of a strange comment. A BBU will improve performance but
> Postgres doesn't require one to guarantee data integrity.
> 
> If your drives have write caching disabled (ie write-through) and your
> controller does write-through caching and you leave fsync=on and
> full_page_writes=on which is the default then you shouldn't have any data
> integrity issues.

That was my point, controllers without BBU usually leave drive caches
turned on, as with drive caches off performance would be unbearable bad.


-- 
Best regards,
Hannes Dorbath

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