Hello, On an experimental system I changed the device mapper from 1.01.02 to 1.02.02 and lvm from 2.01.08 to 2.02.01 and upgraded on FC4 from 2.6.13 to 2.6.14-1.1653_FC4. Create a LV, create a snapshot, dd if=/dev/zero of=test bs=1M count=10000 on the LV (not the snapshot), then try to remove the snapshot and the kernel faults. I suspect that the outstanding block I/Os are probably the issue. You ask about the 5 second outage of ietd? the iscsi initiators see the event and reconnect - as long as the outage is not more than 1 minute (windows does not like it, linux is very resilient about it). Steffen ________________________________ Steffen Plotner Systems Administrator/Programmer Systems & Networking Amherst College PO BOX 5000 Amherst, MA 01002-5000 Tel (413) 542-2348 Fax (413) 542-2626 Email: swplotner@amherst.edu ________________________________ ________________________________ From: linux-lvm-bounces@redhat.com on behalf of Ming Zhang Sent: Wed 2/1/2006 3:54 PM To: LVM general discussion and development Subject: RE: 'snapshot' target still experimental :-( i can confirm this. iet runs well with heavy io until you create many snapshots. lvresize will be slow as well, though not hang. i think that is because the outstanding bio? not quite since i faced that several months ago. ps, not lvm related, but if u stop iet for 5 seconds. i guess iscsi ini will be unhappy? :P we can discuss in iet list. ming On Wed, 2006-02-01 at 13:39 -0500, Steffen Plotner wrote: > Hi, > > I apologize for looking up your machine. I have reported this problem > sometime ago in November of last year. > > https://www.redhat.com/archives/linux-lvm/2005-November/msg00044.html > > We currently deployed an iscsi-target (from sourceforge) server on FC4 > which functions well, until we utilize snapshots. The way I currently > remove snapshots is to stop the iscsi-target daemon for 5 seconds, to > let everything settle, then remove the snap, the restart the > iscsi-target and all is ok (of course this is not how I would like to do > things.. :). > > I have tried several patches dm and lvm in late December and they did > not help. I have specifics at my house. I will email those later on. > Thank you for responding to this issue. > > Steffen > > -----Original Message----- > From: linux-lvm-bounces@redhat.com [mailto:linux-lvm-bounces@redhat.com] > On Behalf Of Alasdair G Kergon > Sent: Wednesday, February 01, 2006 1:31 PM > To: LVM general discussion and development > Subject: Re: 'snapshot' target still experimental :-( > > On Wed, Feb 01, 2006 at 01:07:20PM -0500, Steffen Plotner wrote: > > cd to a directory on an lv that has an active snapshot dd if=/dev/zero > > > of=test bs=1M count=10000 > > > And see how hard it is to remove a live active snapshot. > > Strange - I don't recall anyone reporting that problem before. > > I've just tried it here and the machine locked up:-( > > Alasdair > -- > agk@redhat.com > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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