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Re: SSD performance

From: Florian Weimer <fweimer(at)bfk(dot)de>
To: Craig Ringer <craig(at)postnewspapers(dot)com(dot)au>
Cc: Luke Lonergan <LLonergan(at)greenplum(dot)com>, "david(at)lang(dot)hm" <david(at)lang(dot)hm>, "glynastill(at)yahoo(dot)co(dot)uk" <glynastill(at)yahoo(dot)co(dot)uk>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: SSD performance
Date: 2009-01-23 14:30:26
Message-ID: 82fxja2iyl.fsf@mid.bfk.de (view raw or flat)
Thread:
Lists: pgsql-performance
* Craig Ringer:

> I'd be much more confident with something like those devices than I
> would with an OS ramdisk plus startup/shutdown scripts to initialize it
> from a file and write it out to a file. Wouldn't it be a pain if the UPS
> didn't give the OS enough warning to write the RAM disk out before
> losing power...

The cache warm-up time can also be quite annoying.  Of course, with
flash-backed DRAM, this is a concern as long as you use the cheaper,
slower variants for the backing storage.

-- 
Florian Weimer                <fweimer(at)bfk(dot)de>
BFK edv-consulting GmbH       http://www.bfk.de/
Kriegsstra├če 100              tel: +49-721-96201-1
D-76133 Karlsruhe             fax: +49-721-96201-99

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