From: Dave Chinner <david@fromorbit.com>
To: Stefan Priebe <s.priebe@profihost.ag>
Cc: "xfs@oss.sgi.com" <xfs@oss.sgi.com>
Subject: Re: xfs_growfs / planned resize / performance impact
Date: Mon, 6 Aug 2012 06:57:28 +1000 [thread overview]
Message-ID: <20120805205728.GT2877@dastard> (raw)
In-Reply-To: <C4E0639A-87DE-4D38-8097-9B71D0947ABE@profihost.ag>
On Sun, Aug 05, 2012 at 07:46:33AM +0200, Stefan Priebe wrote:
> Am 05.08.2012 um 00:43 schrieb Dave Chinner <david@fromorbit.com>:
>
> > On Tue, Jul 31, 2012 at 03:56:54PM +0200, Stefan Priebe - Profihost AG wrote:
> >> Hello list,
> >>
> >> i'm planning to create a couple of VMs with just 30GB of space while
> >> using xfs as the main filesystem.
> >>
> >> Now i alreay know that some of the VMs will grow up to 250GB while
> >> resizing the block device and using xfs_growfs.
> >
> > Just use thin provisioning and make it 250GB to begin with. Thin
> > provisioning mades filsystem grow/shrink pretty much redundant....
>
> But dm thin isn't stable isn't it?
AFAIK, It's mostly stable.
> Does xfs reallocate used parts of the block
> Device before using new parts?
Sometimes. Depends on workload, locality of reference, patterns of
freeing and allocation, etc.
> Otherwise deleting and recreating files will result in full used space pretty fast.
fstrim. dm-thinp supports discard commands just fine.
Cheers,
Dave.
--
Dave Chinner
david@fromorbit.com
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prev parent reply other threads:[~2012-08-05 20:57 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-31 13:56 xfs_growfs / planned resize / performance impact Stefan Priebe - Profihost AG
2012-07-31 17:27 ` Stan Hoeppner
2012-08-03 4:03 ` Eric Sandeen
2012-08-03 6:09 ` Stefan Priebe - Profihost AG
2012-08-03 13:46 ` Eric Sandeen
2012-08-05 11:03 ` Martin Steigerwald
2012-08-05 12:34 ` Stan Hoeppner
2012-08-05 13:49 ` Martin Steigerwald
2012-08-05 20:26 ` Stan Hoeppner
2012-08-05 15:54 ` Stefan Priebe
2012-08-06 11:42 ` Michael Monnerie
2012-08-04 22:43 ` Dave Chinner
2012-08-05 5:46 ` Stefan Priebe
2012-08-05 11:06 ` Martin Steigerwald
2012-08-05 11:35 ` Andy Bennett
2012-08-05 20:57 ` Dave Chinner [this message]
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