[Pkg-iscsi-maintainers] Bug#498616: Unmounting LVM'd isci based filesystem
Ritesh Raj Sarraf
rrs at debian.org
Tue Jun 8 18:39:46 UTC 2010
On Tuesday 08 Jun 2010 19:54:12 Ritesh Raj Sarraf wrote:
> > We (as debian user) have another problem with lenny and iscsi + lvm +
> > multipath (should I open another bug?). I try to explain it here:
> > # pwd
> > /etc/rc6.d
> > # ls -1 multipath iscsi lvm
> > K20multipath-tools
> > K80umountiscsi.sh
> > K81open-iscsi
> > S50lvm
> > S50lvm2
> > Suppose I have a pv in iscsi lun, and over it a vg, who has a lv.
> > So if multipath is down, how umountiscsi is capable to unmount lvm
> > volume?
> > My server hangs forever when is rebooting or shutting down. With sys+rq W
> > debian said to me there is a process lvchange who is blocked. I can read
> > in redhat issue tracker  about similar bug in redhat systems.
> > Is it possible to "full" support lvm inside iscsi luns ?
For this problem of yours', I had proposed the kernel team for the "Panic on
Hung Task" feature. But it was not included.
You might want to advocate for that bug and ask the kernel team to enable the
feature. Debian BTS #550358
Otherwise, with multipath's "queue_if_no_path" enabled and you lose all paths
to your LUN, you are out of luck.
The idea is the above bug is:
* Kernel detect Hung Task.
* Kernel Panics on Hung Task
* Kernel reboot/reset on Panic
Not the best, but better than going into the data center and hard resetting
Ritesh Raj Sarraf | http://people.debian.org/~rrs
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