From: Michael Stone <mstone+postgres@mathom.us>
To: pgsql-performance@postgresql.org
Subject: Re: Bad iostat numbers
Date: Mon, 04 Dec 2006 12:43:22 -0500
Message-ID: <20061204174320.GX1622@mathom.us> (raw)
In-Reply-To: <33c6269f0612040937l276c5178naecac1983d355e29@mail.gmail.com>
References: <PEEPKDFEHHEMKBBFPOOKKEHCDKAA.carlos.reimer@opendb.com.br>
<Pine.GSO.4.64.0612032336250.19679@westnet.com>
<33c6269f0612032317t9f0bc77n3ff791a5cd88fc80@mail.gmail.com>
<1165249513.14565.329.camel@state.g2switchworks.com>
<33c6269f0612040937l276c5178naecac1983d355e29@mail.gmail.com>
On Mon, Dec 04, 2006 at 12:37:29PM -0500, Alex Turner wrote:
>This discussion I think is important, as I think it would be useful for this
>list to have a list of RAID cards that _do_ work well under Linux/BSD for
>people as recommended hardware for Postgresql. So far, all I can recommend
>is what I've found to be good, which is 3ware 9500 series cards with 10k
>SATA drives. Throughput was great until you reached higher levels of RAID
>10 (the bonnie++ mark I posted showed write speed is a bit slow). But that
>doesn't solve the problem for SCSI. What cards in the SCSI arena solve the
>problem optimally? Why should we settle for sub-optimal performance in SCSI
>when there are a number of almost optimally performing cards in the SATA
>world (Areca, 3Ware/AMCC, LSI).
Well, one factor is to be more precise about what you're looking for; a
HBA != RAID controller, and you may be comparing apples and oranges. (If
you have an external array with an onboard controller you probably want
a simple HBA rather than a RAID controller.)
Mike Stone
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To: pgsql-performance@postgresql.org
Cc: mstone+postgres@mathom.us
Subject: Re: Bad iostat numbers
In-Reply-To: <20061204174320.GX1622@mathom.us>
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