[Linux-cluster] ha-lvm

[Jonathan Barber]

On 3 November 2010 17:55, Randy Zagar <zagar at arlut.utexas.edu> wrote:
>
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> I frequently find that I'm unable to umount volumes, even after lsof
> and fuser return nothing relevant, and have to "force" a "lazy" umount
> like so:
>
>    umount -lf /dir
>
> because both "umount /dir" and "umount -f /dir" fail.

That's a cool option, but I'd be very worried about corrupting the
filesystem if it was mounted on a second node whilst a process was
holding the filesystem open on the original node.

> - -RZ
>
>>
>> On Nov 3, 2010, at 2:15 AM, "Jankowski, Chris"
>> <Chris.Jankowski at hp.com> wrote:
>>
>>> Corey,
>>>
>>> I vaguely remember from my work on UNIX clusters many years ago
>>> that if /dir is the mount point of a mounted filesystem then cd
>>> /dir or into any directory below /dir from an interactive shell
>>> will prevent an unmount of the filesystem i.e. umount /dir will
>>> fail. I believe that this restriction is because it will create
>>> an inconsistency in the state of the shell process. lsof will not
>>> show it.
>>>
>>> Of course most users after login end up in the home directory by
>>> default.
>>>
>>> I believe that Linux will have the same semantics as UNIX. You
>>> can test that easily on a standalone Linux box.
>>>
>>> Regards,
>>>
>>> Chris Jankowski
>>>
>>>
>>> -----Original Message----- From: linux-cluster-bounces at redhat.com
>>> [mailto:linux-cluster- bounces at redhat.com] On Behalf Of Corey
>>> Kovacs Sent: Wednesday, 3 November 2010 07:15 To: linux
>>> clustering Subject: [Linux-cluster] ha-lvm
>>>
>>> Folks,
>>>
>>> I have a 5 node cluster backed by an FC SAN with 5 VG's each with
>>> a single LVM.
>>>
>>> I am using ha_lvm and have lvm.conf configured to use tags as per
>>> the instructions. Things work fine until I try to migrate the
>>> volume containing our home dir (all others work as expected) The
>>> umount for that volume fails and depending on the active config,
>>> the node reboots itself (self_fence=1) or it simply fails and
>>> get's disabled.
>>>
>>> lsof doesn't reveal anything "holding" onto that mount point yet
>>> the umount fails consistently (force_umount is enabled)
>>>
>>> Furthermore, it appears I have at least one ov my VG's with bad
>>> tags, is there a way to show what tags a VG has?
>>>
>>> I've gone over the config several times and although I cannot
>>> show the config, here is a basic rundown in case something jumps
>>> out...
>>>
>>> 5 nodes, dl360g5 2xQcore w/16GB ram EVA8100 2x4GB FC, multipath
>>> 5VG's each w/a single lv each with an ext3 fs. ha lvm in is use
>>> as a measure of protection for the ext3 fs's local locking only
>>> via lvm.conf tags enabled via lvm.conf initrd's are newer than
>>> the lvm.conf changes.
>>>
>>> I did notice that the ext3 label in use on the home volume was
>>> not of the form /home (it was /ha_home) from early testing but
>>> I've corrected that and the umount fail still occurs.
>>>
>>> If anyone has any ideas I'd appreciate it.
>>>
>>> -- Linux-cluster mailing list Linux-cluster at redhat.com
>>> https://www.redhat.com/mailman/listinfo/linux-cluster
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-- 
Jonathan Barber <jonathan.barber at gmail.com>