From: Tomas Vondra <tv@fuzzy.cz>
To: gnuoytr@rcn.com
Cc: pgsql-performance@postgresql.org
Subject: Re: Reports from SSD purgatory
Date: Wed, 24 Aug 2011 21:32:16 +0200
Message-ID: <d32d411b09d8e7c614772de567a94229.squirrel@sq.gransy.com> (raw)
In-Reply-To: <201108241848.061232@ms14.lnh.mail.rcn.net>
References: <4E49B0A0.2060705@2ndQuadrant.com>
<201108241848.061232@ms14.lnh.mail.rcn.net>
On 24 Srpen 2011, 20:48, gnuoytr@rcn.com wrote:
> It's worth knowing exactly what that means. Turns out that NAND quality
> is price specific. There's gooduns and baduns. Is this a failure in the
> controller(s) or the NAND?
Why is that important? It's simply a failure of electronics and it has
nothing to do with the wear limits. It simply fails without prior warning
from the SMART.
> Also, given that PG is *nix centric and support for TRIM is win centric,
> having that makes a big difference in performance.
Windows specific? What do you mean? TRIM is a low-level way to tell the
drive 'this block is empty and may be used for something else' - it's just
another command sent to the drive. It has to be supported by the
filesystem, though (e.g. ext4/btrfs support it).
Tomas
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: tv@fuzzy.cz, gnuoytr@rcn.com
Subject: Re: Reports from SSD purgatory
In-Reply-To: <d32d411b09d8e7c614772de567a94229.squirrel@sq.gransy.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox