Message-ID: <4614A01F.9090806@tweakers.net>
Date: Thu, 05 Apr 2007 09:07:11 +0200
From: Arjen van der Meijden <acmmailing@tweakers.net>
User-Agent: Thunderbird 2.0b2 (Windows/20070116)
MIME-Version: 1.0
To: "jason@ohloh.net" <jason@ohloh.net>
CC: pgsql-performance@postgresql.org
Subject: Re: SCSI vs SATA
References: <200704042027.l34KRMI03358@momjian.us>
	<46140B49.3060205@commandprompt.com> <46140F05.9090403@mochima.com>
	<649E6F5F-13D0-4D2F-A842-722320FF8F3C@ohloh.net>
In-Reply-To: <649E6F5F-13D0-4D2F-A842-722320FF8F3C@ohloh.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit

If the 3U case has a SAS-expander in its backplane (which it probably 
has?) you should be able to connect all drives to the Adaptec 
controller, depending on the casing's exact architecture etc. That's 
another two advantages of SAS, you don't need a controller port for each 
harddisk (we have a Dell MD1000 with 15 drives connected to a 4-port 
external sas connection) and you can mix SAS and SATA drives on a 
SAS-controller.

Best regards,

Arjen

On 5-4-2007 1:42 jason@ohloh.net wrote:
> In a perhaps fitting compromise, I have decide to go with a hybrid 
> solution:
> 
> 8*73GB 15k SAS drives hooked up to Adaptec 4800SAS
> PLUS
> 6*150GB SATA II drives hooked up to mobo (for now)
> 
> All wrapped in a 16bay 3U server. My reasoning is that the extra SATA 
> drives are practically free compared to the rest of the system (since 
> the mobo has 6 onboard connectors). I plan on putting the pg_xlog & 
> operating system on the sata drives and the tables/indices on the SAS 
> drives, although  I might not use the sata drives for the xlog if they 
> dont pan out perf-wise. I plan on getting the battery backed module for 
> the adaptec (72 hours of charge time).
> 
> Thanks to everyone for the valuable input. I hope i can do you all proud 
> with the setup and postgres.conf optimizations.
> 
> -jay
> 
> 
> On Apr 4, 2007, at 1:48 PM, Carlos Moreno wrote:
> 
>>
>>> Problem is :), you can purchase SATA Enterprise Drives.
>>
>> Problem????  I would have thought that was a good thing!!!   ;-)
>>
>> Carlos
>> -- 
>>
>>
>> ---------------------------(end of broadcast)---------------------------
>> TIP 7: You can help support the PostgreSQL project by donating at
>>
>>                http://www.postgresql.org/about/donate
> 
> 
> ---------------------------(end of broadcast)---------------------------
> TIP 7: You can help support the PostgreSQL project by donating at
> 
>                http://www.postgresql.org/about/donate
>