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Re: XFS for postgres databases?

To: olaf@xxxxxxxxxxxxx
Subject: Re: XFS for postgres databases?
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 7 Jun 2004 10:22:25 +0100
Cc: Steve Lord <lord@xxxxxxx>, Jeremy Jackson <jerj@xxxxxxxxxxxx>, Nathan Scott <nathans@xxxxxxx>, linux-xfs@xxxxxxxxxxx
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> nobody suspects that reading block device with mounted filesystem can
> produce any kind of corruption. 
> I think that there should be some info in the kernel config, saying that
> it is not allowed to run ANY program which uses block device for reading
> (like hdparm) on device with mounted XFS filesystem. 

I have a 2.6 patch here that fixes but introduces a deadlock under load
in exchance which I've started to track down, but I've been sidetracked
by some othere issues.

> BTW., if I have XFS on /dev/sda1 is it unsafe to access /dev/sda1 only
> or the whole /dev/sda too? If the latter, it means that modyfying
> partition table is also an unsafe operation. This would be really ugly.

Accessing other partitions or the whole device special file is okay.

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