can I shrink an xfs?

can I shrink an xfs?

[Louis-David Mitterrand]

Hi,

Is it possible to shrink an xfs? I tried using xfs_growfs to no avail.

	zenon:~# xfs_growfs -D 650000000 /backup
	meta-data=/dev/md2               isize=256    agcount=32, agsize=20539552 blks
			 =                       sectsz=4096  attr=1
	data     =                       bsize=4096   blocks=657265248, imaxpct=25
			 =                       sunit=16     swidth=48 blks
	naming   =version 2              bsize=4096  
	log      =internal               bsize=4096   blocks=32768, version=2
			 =                       sectsz=4096  sunit=1 blks, lazy-count=0
	realtime =none                   extsz=196608 blocks=0, rtextents=0
	data size 650000000 too small, old size is 657265248

... even though the fs is 80% full only.

Thanks,

Re: can I shrink an xfs?

[Eric Sandeen]

Louis-David Mitterrand wrote:
> Hi,
> 
> Is it possible to shrink an xfs? I tried using xfs_growfs to no avail.

Nope.

 http://oss.sgi.com/projects/xfs/faq.html#resize

-Eric

> 	zenon:~# xfs_growfs -D 650000000 /backup
> 	meta-data=/dev/md2               isize=256    agcount=32, agsize=20539552 blks
> 			 =                       sectsz=4096  attr=1
> 	data     =                       bsize=4096   blocks=657265248, imaxpct=25
> 			 =                       sunit=16     swidth=48 blks
> 	naming   =version 2              bsize=4096  
> 	log      =internal               bsize=4096   blocks=32768, version=2
> 			 =                       sectsz=4096  sunit=1 blks, lazy-count=0
> 	realtime =none                   extsz=196608 blocks=0, rtextents=0
> 	data size 650000000 too small, old size is 657265248
> 
> ... even though the fs is 80% full only.
> 
> Thanks,
> 
> 

Re: can I shrink an xfs?

[Josef 'Jeff' Sipek]

On Tue, Mar 11, 2008 at 06:29:58PM +0100, Louis-David Mitterrand wrote:
> Hi,
> 
> Is it possible to shrink an xfs? I tried using xfs_growfs to no avail.
 
There's no official/supported way to do it. There might be some tool to do
it, but I'm not aware of any.

Dave, et. al.: why not support shrinking? I know, inode numbers and whatnot,
but that's already being messed up (at least to a degree) with the noikeep
mount option. I think that shrinking would be useful to have - even if you
have to pass it --i-know-what-i-am-doing kind of option. Maybe a offline
shrink via repair would be more viable?

Josef 'Jeff' Sipek.

-- 
Hegh QaQ law'
quvHa'ghach QaQ puS

Re: can I shrink an xfs?

[David Chinner]

On Tue, Mar 11, 2008 at 02:02:10PM -0400, Josef 'Jeff' Sipek wrote:
> On Tue, Mar 11, 2008 at 06:29:58PM +0100, Louis-David Mitterrand wrote:
> > Hi,
> > 
> > Is it possible to shrink an xfs? I tried using xfs_growfs to no avail.
>  
> There's no official/supported way to do it. There might be some tool to do
> it, but I'm not aware of any.
> 
> Dave, et. al.: why not support shrinking? I know, inode numbers and whatnot,
> but that's already being messed up (at least to a degree) with the noikeep
> mount option. I think that shrinking would be useful to have - even if you
> have to pass it --i-know-what-i-am-doing kind of option. Maybe a offline
> shrink via repair would be more viable?

It's being worked on - have a look in the achives at what Ruben Porras has
been doing (and the patches he recently sent). Shrinking involves a lot of
bits to come together sucessful, and we're slowly getting them together.
If you want to get it done faster - help Ruben ;)

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group