On Wed, Aug 06, 2008 at 02:58:16PM -0600, Andrew Patterson wrote: > On Wed, 2008-08-06 at 12:36 -0700, Mike Anderson wrote: > > Pasi K?rkk?inen <pasik@xxxxxx> wrote: > > > On Wed, Aug 06, 2008 at 03:48:12PM +0200, Domenico Viggiani wrote: > > > > * Pasi Kärkkäinen wrote: > > > > > > > > > > Is it possible to resize (grow) dm-multipath devices on the > > > > > fly nowadays? > > > > > > > > > > I googled and found some discussions about the subject, but > > > > > the conclusion seemed to be it's not possible.. that was a > > > > > while ago, so I was wondering if this has been fixed/implemented.. > > > > > > > > > > Using LVM and adding another new LUN/PV is not an option > > > > > always.. it's a lot easier to manage the whole thing if it's > > > > > possible to resize/grow existing LUNs on the fly. > > > > > > > > Nowadays all disk-arrays make online LUN extension a breeze but > > > > unfortunately it seems that dm-multipath is still not able to see new size > > > > without downtime: > > > > http://www.redhat.com/archives/dm-devel/2007-August/msg00205.html > > > > Look also at this recent thread on RHEL5 mailing-list where you can find > > > > also a post from a Red Hat representative: > > > > http://www.redhat.com/archives/rhelv5-list/2008-July/msg00267.html > > > > > > > > Sure, you can just add a new LUN, pvcreate and vgextend but it is not a > > > > viable solution because it causes LUN proliferation. > > > > > > > > Sincerely, I'm still subscribed to this mailing-list only to see if someone > > > > solve this SHAME! > > > > It's a feature that Linux really needs. > > > > > > > > Hope someone pick this cry of pain! > > > > > > > > > > Thanks for the reply. > > > > > > Does someone know what's the actual problem in this? meaning why it hasn't > > > been done yet.. > > > > It has to do with the block layer not using the new size value while there > > are openers. > > > > Andrew submitted a patch series (url below) a while ago to try and address > > this issue, but I do not know the status. I added Andrew to the cc. > > > > http://thread.gmane.org/gmane.linux.scsi/41623 > > > > The above patchset works with SCSI devices. I have tested it with single > SCSI devices under dm/LVM, i.e., a PV is on a single SCSI LUN with only > one path to it. It has not yet been accepted upstream due to not getting > sign-off from Al Viro. I plan on resubmitting soon to add cciss support. > Hopefully Al will getting around to reviewing it sometime this century. > I have heard rumors that Al has some all-encompassing solution for this > problem but hasn't got around to implementing it. I'll test my new > patches with multi-path while I am at it. > Was there some problems/issues with the patchset? Or just lack of time from Al.. -- Pasi -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
