From: Hannes Dorbath <light@theendofthetunnel.de>
To: Chander Ganesan <chander@otg-nc.com>
Subject: Re: [GENERAL] Backup
Date: Wed, 06 Feb 2008 14:29:16 +0100
Message-ID: <47A9B62C.8060508@theendofthetunnel.de> (raw)
In-Reply-To: <47A1E2F6.7060108@otg-nc.com>
References: <00a201c85ee9$fbd1ca00$9b0014ac@wbaus090>
<1201252875.4257.387.camel@ebony.site>
<47A1BD51.3030902@otg-nc.com>
<1201786128.4453.287.camel@ebony.site>
<20080131143405.GC21660@svana.org>
<20080131144314.GH11977@svr2.hagander.net>
<47A1E2F6.7060108@otg-nc.com>
Chander Ganesan wrote:
> 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
One more reason to consider using Solaris ZFS -- it does consistent
snapshots across all file systems.
--
Best regards,
Hannes Dorbath
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To: pgsql-general@postgresql.org
Cc: light@theendofthetunnel.de, chander@otg-nc.com
Subject: Re: [GENERAL] Backup
In-Reply-To: <47A9B62C.8060508@theendofthetunnel.de>
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