From: Mario Weilguni <mweilguni@sime.com>
To: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: pgsql-performance@postgresql.org
Subject: Re: Experience with HP Smart Array P400 and SATA drives?
Date: Tue, 09 Dec 2008 13:15:21 +0100
Message-ID: <493E6159.8040802@sime.com> (raw)
In-Reply-To: <49395B57.EE98.0025.0@wicourts.gov>
References: <4934FE60.30702@sime.com>
<49395B57.EE98.0025.0@wicourts.gov>
Kevin Grittner schrieb:
>>>> Mario Weilguni <mweilguni@sime.com> wrote:
>>>>
>> Has anyone benchmarked this controller (PCIe/4x, 512 MB BBC)? We try
>>
> to
>
>> use it with 8x SATA 1TB drives in RAID-5 mode under Linux, and
>>
> measure
>
>> strange values. An individual drive is capable of delivering 91
>>
> MB/sec
>
>> sequential read performance, and we get values ~102MB/sec out of a
>> 8-drive RAID5, seems to be ridiculous slow. Write performance seems
>>
> to
>
>> be much better, ~300 MB /sec - seems ok to me.
>>
>
> What's your stripe size?
>
> -Kevin
>
We used the default settings, it's 64k. Might a bigger value help here?
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To: pgsql-performance@postgresql.org
Cc: mweilguni@sime.com, Kevin.Grittner@wicourts.gov
Subject: Re: Experience with HP Smart Array P400 and SATA drives?
In-Reply-To: <493E6159.8040802@sime.com>
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