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Re: How to improve db performance with $7K?

From: Bjoern Metzdorf <bm(at)turtle-entertainment(dot)de>
To: Steve Poe <spoe(at)sfnet(dot)cc>
Cc: performance pgsql <pgsql-performance(at)postgresql(dot)org>
Subject: Re: How to improve db performance with $7K?
Date: 2005-03-26 09:59:15
Message-ID: 42453273.2060509@turtle-entertainment.de (view raw or flat)
Thread:
Lists: pgsql-performance
Hi Steve,

> Okay. You trust SATA drives? I've been leary of them for a production 
> database. Pardon my ignorance, but what is a "battery backed cache"?  I 
> know the drives have a built-in cache but I don't if that's the same. 
> Are the 12 drives internal or an external chasis? Could you point me to 
> a place that this configuration exist?

Get 12 or 16 x 74GB Western Digital Raptor S-ATA drives, one 3ware 
9500S-12 or two 3ware 9500S-8 raid controllers with a battery backup 
unit (in case of power loss the controller saves unflushed data), a 
decent tyan board for the existing dual xeon with 2 pci-x slots and a 
matching 3U case for 12 drives (12 drives internal).

Here in Germany chassis by Chenbro are quite popular, a matching one for 
your needs would be the chenbro RM312 or RM414 
(http://61.30.15.60/product/product_preview.php?pid=90 and 
http://61.30.15.60/product/product_preview.php?pid=95 respectively).

Take 6 or 10 drives for Raid 10 pgdata, 2-drive Raid 1 for Transaction 
logs (xlog), 2-drive Raid 1 for OS and Swap, and 2 spare disks.

That should give you about 250 mb/s reads and 70 mb/s sustained write 
rate with xfs.

Regards,
Bjoern

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