From: Joshua D. Drake <jd@commandprompt.com>
To: Greg Smith <greg@2ndQuadrant.com>
Cc: sthomas@optionshouse.com, Merlin Moncure <mmoncure@gmail.com>
Cc: Tomas Vondra <tv@fuzzy.cz>
Cc: pgsql-performance@postgresql.org
Subject: Re: Reliability with RAID 10 SSD and Streaming Replication
Date: Wed, 22 May 2013 12:06:50 -0700
Message-ID: <519D174A.4050703@commandprompt.com> (raw)
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On 05/22/2013 11:06 AM, Greg Smith wrote:
> I have some moderately fast SSD based transactional systems that are
> still using traditional drives with battery-backed cache for the
> sequential writes of the WAL volume, where the data volume is on Intel
> 710 disks. WAL writes really burn through flash cells, too, so keeping
> them on traditional drives can be cost effective in a few ways. That
> approach is lucky to hit 10K TPS though, so it can't compete against
> what a PCI-E card like the FusionIO drives are capable of.
Greg, can you elaborate on the SSD + Xlog issue? What type of burn
through are we talking about?
JD
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To: pgsql-performance@postgresql.org
Cc: jd@commandprompt.com, greg@2ndQuadrant.com, mmoncure@gmail.com, tv@fuzzy.cz
Subject: Re: Reliability with RAID 10 SSD and Streaming Replication
In-Reply-To: <519D174A.4050703@commandprompt.com>
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