On Fri, 2008-11-14 at 00:12 +0000, Alasdair G Kergon wrote: > On Thu, Nov 13, 2008 at 03:48:58PM -0800, Chandra Seetharaman wrote: > > The problem reported by Moger Babu was caused due to the architectural > > change made when we moved from dm hardware handler to SCSI hardware > > handler. > > pg_init is single initialisation for the group. > It only needs to happen on one path. Yes, that was my initial response too. dm hardware handlers did not maintain a "state" for each path in which case activating/initializing the controller from one path was sufficient for all the paths connected to the controller to work as expected. SCSI Hardware Handlers maintain a "state" for each path, so that they can fail an I/O at prep_fn, if the path is not an "active" path, which is what lead to the bug Babu saw. > > It sounds to me that what you're adding here is a *per-path* initialisation, > something *separate* from (and additional to) the existing *per-group* pg_init. No, I "replaced" the "per-group" pg_init with "per-path" init. > > Has this patch been tested on EMC? No, we have tested it with LSI RDAC. I will send a separate email to EMC folks (on Cc here) describing the problem and the fix and ask their help in testing. > > Alasdair -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
