From: | "Mike Sofen" <msofen(at)runbox(dot)com> |
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To: | <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: I/O - Increase RAM |
Date: | 2016-04-13 21:39:51 |
Message-ID: | 038a01d195cd$0409a3f0$0c1cebd0$@runbox.com |
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Lists: | pgsql-general |
|From: John R Pierce Sent: Wednesday, April 13, 2016 1:53 PM
|
|On 4/13/2016 1:43 PM, drum(dot)lucas(at)gmail(dot)com wrote:
|> At the moment I'm having 100% I/O during the day. My server has SATA
|> HDs, and it can't be changed now.
|> So, to solve the problem (or at least try) I was thinking about double
|> the RAM, and by doing that, increasing the cache.
|
|depends on if its read or write IO. many of our database servers are
|nearly 100% write IO, only thing that will speed that up is faster disks and/or
|more disks in raid10.
|--
|john r pierce, recycling bits in santa cruz
Agree with John and also add that if your READ queries or data model are not optimized then you could throw a TB of ram at it and see no difference. You need to analyze your queries and find out WHY there's so much i/o. It sounds like thrash to me...so you need to do some homework and get the behaviors sorted out, then it should become obvious what needs fixing.
Mike
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