From: Philippe Marzin <philippe.marzin@free.fr>
Cc: pgsql-performance@postgresql.org
Subject: Re: Reliability recommendations
Date: Sat, 25 Feb 2006 01:18:52 +0100
Message-ID: <43FFA26C.5020802@free.fr> (raw)
In-Reply-To: <C024DFA1.1DC2D%llonergan@greenplum.com>
References: <C024DFA1.1DC2D%llonergan@greenplum.com>
Do you have a hw reference that runs that fast (5 x 30 = 150MB/s) ?
Luke Lonergan a écrit :
> Joshua,
>
> On 2/24/06 9:19 AM, "Joshua D. Drake" <jd@commandprompt.com> wrote:
>
>
>> This machine... if you run it in raid 5 will only get 7-9 megabytes a
>> second READ! performance. That is with 6 SCSI drives.
>> If you run it in RAID 10 you get a more reasonable 50-55 megabytes per
>> second.
>>
>> I don't have it sitting in front of me or I would give you an exact
>> model number.
>>
>> This machine also uses the serverworks chipset which is known to be a
>> catastrophe.
>>
>
> I'd be more shocked if this weren't also true of nearly all SCSI HW RAID
> adapters of this era. If you had ordered an HP DL380 server you'd get about
> the same performance.
>
> BTW - I don't think there's anything reasonable about 50-55 MB/s from 6
> disks, I'd put the minimum for this era machine at 5 x 30 = 150MB/s.
>
> - Luke
>
>
>
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To: pgsql-performance@postgresql.org
Cc: philippe.marzin@free.fr
Subject: Re: Reliability recommendations
In-Reply-To: <43FFA26C.5020802@free.fr>
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