> -----Original Message----- > From: Sumit Gupta [mailto:sum...@brocade.com] > Sent: Wednesday, December 16, 2009 2:24 PM > To: Steffen Plotner; storage-discuss@opensolaris.org > Subject: RE: Offlining a LU timing > > > If there is no I/O, LU offline should be instantaneous. Looks > like either there is some pending I/O or you are running into a bug. > > One thing to check is the kernel thread list. Run mdb -k > (during those 20 seconds) and type $<threadlist <enter> > > This will produce a long output. Maybe you can post it here > or attach it and post a link. > > Sumit
Hi Sumit, Thank you for responding and also a thank you for being a developer member of the comstar project - excellent. I have 3 urls with traces using the mdb -k command you asked below. The system has 14 Lus, 2 of them are doing IO (can be either read or write). I am using comstar+iscsit. The first trace is when the system is chucking along doing IO (http://www3.amherst.edu/~swplotner/comstar/debug/lunoffline-quiet-threa ds). At the time of changing a LUNs state from online to offline, I have removed the network interfaces to prevent any further IO from the initiator. The second trace is when I started to stmfadm offline-lu the first 4 Lus (http://www3.amherst.edu/~swplotner/comstar/debug/lunoffline-long-thread s). The third trace is after 12 LUs have been offlined and 2 LUs remained in the 'offlining' state for 20 seconds (http://www3.amherst.edu/~swplotner/comstar/debug/lunoffline-long2-threa ds). Once the 20 seconds passed, the last 2 LUs were offline. The reason for this is to allow us to zpool export the underlying storage so that it can be moved to a different node. I am trying to reduce the time on taking a LU into an offline state, so that zpool export works - otherwise zpool export refuses to export because it has open LUs (pool is busy is the message even with zpool export -f) Steffen _______________________________________________ storage-discuss mailing list storage-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/storage-discuss
