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Re: SSD + RAID

From: Brad Nicholson <bnichols(at)ca(dot)afilias(dot)info>
To: Greg Smith <greg(at)2ndquadrant(dot)com>
Cc: Karl Denninger <karl(at)denninger(dot)net>, Laszlo Nagy <gandalf(at)shopzeus(dot)com>, pgsql-performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: SSD + RAID
Date: 2009-11-13 19:24:16
Message-ID: 4AFDB260.10203@ca.afilias.info (view raw or flat)
Thread:
Lists: pgsql-performance
Greg Smith wrote:
> Karl Denninger wrote:
>> With the write cache off on these disks they still are huge wins for
>> very-heavy-read applications, which many are.
> Very read-heavy applications would do better to buy a ton of RAM 
> instead and just make sure they populate from permanent media (say by 
> reading everything in early at sequential rates to prime the cache).  
> There is an extremely narrow use-case where SSDs are the right 
> technology, and it's only in a subset even of read-heavy apps where 
> they make sense.

Out of curiosity, what are those narrow use cases where you think SSD's 
are the correct technology?

-- 
Brad Nicholson  416-673-4106
Database Administrator, Afilias Canada Corp.


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