RE: [SSI-users] Clean up of .cfs_unlink folder on mount points.

[Walker, B. J <bru...@hp...>]

Files in .cfs_unlink should be unlinked files that are still open (and
thus the space cannot be freed).  The purpose of these is to ensure the
data is not lost on a failover.  I would hope that fuser would tell you
which program still had them open but I haven't tried it.

The scenario is:
A. process opens a file with data in it;
B. process unlinks the file (or someone else unlinks it);
C. CFS creates a link in .cfs_unlink so ext3 won't throw the data away
on a failover;
D. processes exits; cfs unlinks the file in .cfs_unlink and the space is
freed;

If the process doing the open was on node 2 (and the filesystem was
mounted on node 1), and node 1 failed, the data would be preserved so
the process would not see an error.=20

If the process doing the open etc. was on node 1 and node 1 failed, the
failover code should detect that no one has the .cfs_unlink/xxx file
open and thus clean up and free the space.

Bruce


> -----Original Message-----
> From: ssi...@li...=20
> [mailto:ssi...@li...] On=20
> Behalf Of Mohan Srinivas
> Sent: Tuesday, March 01, 2005 6:00 PM
> To: ssi...@li...
> Subject: [SSI-users] Clean up of .cfs_unlink folder on mount points.
>=20
>=20
>=20
> Hi,
>=20
> I am using ssi kernel 2.4.21-15.0.4.EL_ssi_2smp on a 3 node cluster.
> (I'm tied to this kernel version since I run syase and replication
> server on it and they don't run on hihger kernel version). I=20
> noticed my
> chard mounts (/ and /ifs) have a ".cfs_unlink" folder in=20
> them. I can see
> that the size of the cfs_unlink folder on both disks is quite=20
> large but
> I cannot clean it up.
>=20
> When I try to clean it up:
>=20
> drwxr-xr-x    0 root     root         4096 Mar  1 17:54=20
> 0001048a4ac0c8ff
> drwxr-xr-x    0 root     root         4096 Mar  1 17:54=20
> 000104894ac0c8e4
> drwxr-xr-x    0 root     root         4096 Mar  1 17:54=20
> 000104884ac0c8c7
> srwxr-xr-x    0 root     root            0 Mar  1 17:57=20
> 00072f2476c62309
> -rw-------    0 root     root     99608640 Mar  1 18:02=20
> 00077a5b50205f51
> [root@zeus .cfs_unlink]#
> [root@zeus .cfs_unlink]# rm -f 00077a5b50205f51
> [root@zeus .cfs_unlink]# ls -l 00077a5b50205f51
> -rw-------    0 root     root     99608945 Mar  1 18:02=20
> 00077a5b50205f51
> [root@zeus .cfs_unlink]# rm -f 00077a5b50205f51
> [root@zeus .cfs_unlink]# ls -l 00077a5b50205f51
> -rw-------    0 root     root     99608945 Mar  1 18:02=20
> 00077a5b50205f51
>=20
> A rm -fr does not work from within the .cfs_unlink folder and neither
> does an unlink for the files.
>=20
> When I try to do a lsattr/chattr, it fails with an=20
> "inappropriate ioctl
> for device while reading flags" message.
>=20
> My / is mounted with options "chard,defaults,node=3D1:2"
> /ifs mounted with options "rw,chard,node=3D1:2" and both are ext3.
>=20
>=20
> I need to clean up the cfs_unlink folders on both since they=20
> are eating
> up lots of space on my disks. Is this problem because of something in
> the mount options I am using? And what is the purpose of this
> .cfs_unlink folder? I could not find much info on it by googling
> either... Does anyone have some info on this? Thanks.
>=20
> Srinivasan Mohan
> Capco
>=20
>=20
>=20
>=20
> **************************************************************
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>=20
> immediately. You should not copy, use or disseminate the
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> information contained in the email.
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> the views of Capco.
>=20
http://www.capco.com/

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