[lvm-devel] iSCSI logout hangs LVM

[Ty! Boyack]

Bryn M. Reeves wrote:
> Dave Wysochanski wrote:
>> On Wed, 2009-01-14 at 22:23 -0700, Ty! Boyack wrote:
>>> This is all being done on a Fedora 9 boxes with updated packages:
>>> lvm2-2.02.33-11.fc9.x86_64
>>> iscsi-initiator-utils-6.2.0.870-1.0.fc9.x86_64
>>> device-mapper-1.02.24-11.fc9.x86_64
>>> udev-124-2.fc9.x86_64
>>> kernel-2.6.27.9-73.fc9.x86_64
>>>
>>> I would appreciate any thoughts or suggestion on this!
>>>
>>
>> You need to make sure iscsi and multipath are setup properly to
>> eventually fail the IO.  I believe the README and/or config files in
>> these projects describe the settings needed.
>
> Or remove the multipath maps for these devices *before* logging out of 
> the target. This is a common mistake with multipath - when you're 
> removing storage, the ordering should normally be:
>
> - unmount file systems / stop applications using the device
> - flush multipath map(s) (-f/-F)
> - remove underlying path devices (iSCSI logout etc)
>
> If this isn't possible, there's a feature in the RHEL builds of 
> multipath-tools named "flush_on_last_del" which may help you here. It 
> will disable queueing for the multipath target when the last path to 
> it disappears, preventing I/O from hanging forever on the missing 
> devices.
Brilliant, both of you.  Thanks very much. 

-Ty!

-- 
-===========================-
  Ty! Boyack
  NREL Unix Network Manager
  ty at nrel.colostate.edu
  (970) 491-1186
-===========================-