Am Samstag, 23. Juli 2005 17:20 schrieb Alasdair G Kergon: > On Sat, Jul 23, 2005 at 04:44:22PM +0200, Dr. Jürgen Vollmer wrote: > > This is reproducable. > > If I wait long enough (some 10 minutes) everything seems to work again. > > Add one or more -v options to the lvm commands to see more details. The majer difference has been between a success and a failure has been: > LV VGhome/lvm-snapshot in use: not removing > Couldn't deactivate new snapshot. > Run 'dmsetup info -c' and 'ls -l /sys/block/dm*' between lvm commands > to check the changes have taken place. after a non-successful lvcreate I get: > dmsetup info -c Name Maj Min Stat Open Targ Event UUID VGhome-lvm--snapshot 253 1 L--w 0 1 0 5mUudIrDe2N4x6x1D2T969Ux32kgljxXgbwKmGxoDE0SVIduDE3fboFFrMLFTqRB VGhome-LVhome 253 0 L--w 2 5 0 5mUudIrDe2N4x6x1D2T969Ux32kgljxX00000000000000000000000000000000 After a successfull lvcreate I get: > dmsetup info -c Name Maj Min Stat Open Targ Event UUID VGhome-lvm--snapshot-cow 253 1 L--w 1 1 0 5mUudIrDe2N4x6x1D2T969Ux32kgljxXAn7i5UocqOGzPhK0p9gT7zRjxJK1Nacn-cow VGhome-lvm--snapshot 253 3 L--w 2 1 0 5mUudIrDe2N4x6x1D2T969Ux32kgljxXAn7i5UocqOGzPhK0p9gT7zRjxJK1Nacn VGhome-LVhome 253 0 L--w 2 1 0 5mUudIrDe2N4x6x1D2T969Ux32kgljxX00000000000000000000000000000000 VGhome-LVhome-real 253 2 L--w 2 5 0 5mUudIrDe2N4x6x1D2T969Ux32kgljxX00000000000000000000000000000000-real but I have no glue what this means :-( > Is there much or any I/O happening on the snapshotted device while you do > this? no. > Does adding 'sync' in between commands make any difference? no I observed the following: Initially I used "--extents 754" approx. 2.9GB. If I reduce the size to 512M or less, lvcreate is always successful. For any value greater than 512M, the behaviour is as described. With best regards Jürgen PS: My physcial setting is: > pvdisplay File descriptor 10 left open File descriptor 11 left open --- Physical volume --- PV Name /dev/sdb2 VG Name VGhome PV Size 16,08 GB / not usable 0 Allocatable yes (but full) PE Size (KByte) 4096 Total PE 4117 Free PE 0 Allocated PE 4117 PV UUID qYRKMw-gcHH-MU12-qzMm-7Kpp-m0wD-bxYB9Q --- Physical volume --- PV Name /dev/sdc2 VG Name VGhome PV Size 33,17 GB / not usable 0 Allocatable yes (but full) PE Size (KByte) 4096 Total PE 8492 Free PE 0 Allocated PE 8492 PV UUID znM82W-cSIj-e0jR-CN4A-n1vZ-rdsm-a3uKfd --- Physical volume --- PV Name /dev/sdd1 VG Name VGhome PV Size 68,49 GB / not usable 0 Allocatable yes PE Size (KByte) 4096 Total PE 17533 Free PE 754 Allocated PE 16779 PV UUID UDiW4I-BXof-tKiE-QCTX-6pcW-iHZn-oxsT4U all disks are SCSI disks (Ultra wide) -- Dr.rer.nat. Juergen Vollmer, Viktoriastrasse 15, D-76133 Karlsruhe Tel: +49(721) 9204871 Fax: +49(721) 24874 Juergen.Vollmer@informatik-vollmer.de www.informatik-vollmer.de Internet-Telefonie: www.skype.com Benutzer: juergen.vollmer
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