reserved blocks pool default size

reserved blocks pool default size

[Łukasz Oleś]

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Hi,

I updated kernel from 2.6.27 to 2.6.35 and noticed that free size on my 
xfs volume changed. Before update there was 7MB free space, now there is 
none.

After some investigation I found that default size for reserved block 
pool changed [1].
On this volume I have one very big file which is exported as iSCSI disk 
via SCST and one small configuration file. The big file size will never 
change. Small file size can change only by some KB.

With this assumptions, can I revert this change and set reserved blocks 
pool size to 1024 blocks?

[1]. http://kerneltrap.org/mailarchive/git-commits-head/2010/3/6/28671

Reagards,

--
Łukasz Oleś

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Re: reserved blocks pool default size

[Christoph Hellwig]

On Fri, Jan 27, 2012 at 12:02:22PM +0100, ??ukasz Ole?? wrote:
> Hi,
> 
> I updated kernel from 2.6.27 to 2.6.35 and noticed that free size on
> my xfs volume changed. Before update there was 7MB free space, now
> there is none.
> 
> After some investigation I found that default size for reserved
> block pool changed [1].
> On this volume I have one very big file which is exported as iSCSI
> disk via SCST and one small configuration file. The big file size
> will never change. Small file size can change only by some KB.
> 
> With this assumptions, can I revert this change and set reserved
> blocks pool size to 1024 blocks?

If it worked fine for your workload before it should work fine with
newer kernels, too.

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Re: reserved blocks pool default size

[Dave Chinner]

On Fri, Jan 27, 2012 at 12:02:22PM +0100, Łukasz Oleś wrote:
> Hi,
> 
> I updated kernel from 2.6.27 to 2.6.35 and noticed that free size on
> my xfs volume changed. Before update there was 7MB free space, now
> there is none.
> 
> After some investigation I found that default size for reserved
> block pool changed [1].
> On this volume I have one very big file which is exported as iSCSI
> disk via SCST and one small configuration file. The big file size
> will never change. Small file size can change only by some KB.
> 
> With this assumptions, can I revert this change and set reserved
> blocks pool size to 1024 blocks?

xfs_io -c "resblks 1024" <mntpt/one-very-big-file>

after the filesystem is mounted will set the reserve block pool back
to the 1024 blocks you had before.

Cheers,

Dave.
-- 
Dave Chinner
david@fromorbit.com

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