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Re: [GENERAL] Backup

From: Chander Ganesan <chander(at)otg-nc(dot)com>
To: Magnus Hagander <magnus(at)hagander(dot)net>
Cc: Simon Riggs <simon(at)2ndquadrant(dot)com>, Phillip Smith <phillip(dot)smith(at)weatherbeeta(dot)com(dot)au>, 'Dominic Carlucci' <carlucci(at)cae(dot)com>, pgsql-general(at)postgresql(dot)org, pgsql-admin(at)postgresql(dot)org, carlucci(at)cae(dot)ca
Subject: Re: [GENERAL] Backup
Date: 2008-01-31 15:02:14
Message-ID: 47A1E2F6.7060108@otg-nc.com (view raw or flat)
Thread:
Lists: pgsql-adminpgsql-general
Magnus Hagander wrote:
> On Thu, Jan 31, 2008 at 03:34:05PM +0100, Martijn van Oosterhout wrote:
>   
>> On Thu, Jan 31, 2008 at 01:28:48PM +0000, Simon Riggs wrote:
>>     
>>> That sentence has no place in any discussion about "backup" because the
>>> risk is not just a few transactions, it is a corrupt and inconsistent
>>> database from which both old and new data would be inaccessible.
>>>       
>> Hmm? I thought the whole point of a filesystem snapshot was that it's
>> the same as if the system crashed. And I was fairly sure we could
>> recover from that...
>>     
>
> That was my assumption as well. *Assuming* that the filesystem snapshot is
> consistent. There are a bunch of solutions that don't do consistent
> snapshots between different partitions, so if your WAL or one tablespace is
> on a different partition, you'll get corruption anyway... (seen this in
> Big Commercial Database, so that's not a pg problem)
>   
Agreed.  That's why I made it a point to mention that all of your 
tablespaces should be on the same file system...  In hindsight, I should 
have also stated that your WAL logs should be on the same file system as 
well...

-- 
Chander Ganesan
Open Technology Group, Inc.
One Copley Parkway, Suite 210
Morrisville, NC  27560
919-463-0999/877-258-8987
http://www.otg-nc.com


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