http://bugzilla.suse.com/show_bug.cgi?id=1172566
http://bugzilla.suse.com/show_bug.cgi?id=1172566#c6
--- Comment #6 from heming zhao ---
in my kvm-qemu, 2 1000g scsi disks, still can't reproduction.
```
tb-base40g:~ # pvcreate /dev/sdb
Physical volume "/dev/sdb" successfully created.
tb-base40g:~ # pvcreate /dev/sda
Physical volume "/dev/sda" successfully created.
tb-base40g:~ # vgcreate test /dev/sdb /dev/sda
Volume group "test" successfully created
tb-base40g:~ # lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 1000G 0 disk
sdb 8:16 0 1000G 0 disk
sr0 11:0 1 4.3G 0 rom
vda 253:0 0 40G 0 disk
├─vda1 253:1 0 8M 0 part
├─vda2 253:2 0 38G 0 part /
└─vda3 253:3 0 2G 0 part [SWAP]
vdb 253:16 0 1G 0 disk
└─vdb1 253:17 0 1023M 0 part
vdc 253:32 0 1G 0 disk
└─vdc1 253:33 0 1023M 0 part
tb-base40g:~ # lvcreate --size 512g --name giant test /dev/sda
Logical volume "giant" created.
tb-base40g:~ # lvcreate --size 96g --name giant-cache test /dev/sdb
Logical volume "giant-cache" created.
tb-base40g:~ # lvconvert --type cache --cachevol giant-cache --cachemode
writeback --chunksize 128 test/giant
Erase all existing data on test/giant-cache? [y/n]: y
WARNING: repairing a damaged cachevol is not yet possible.
WARNING: cache mode writethrough is suggested for safe operation.
Continue using writeback without repair?y
Logical volume test/giant is now cached.
tb-base40g:~ # lvconvert --splitcache test/giant
Flushing 0 blocks for cache test/giant.
Logical volume test/giant is not cached and test/giant-cache is unused.
tb-base40g:~ # lvresize --size 128g test/giant-cache
Size of logical volume test/giant-cache changed from 96.00 GiB (24576
extents) to 128.00 GiB (32768 extents).
Logical volume test/giant-cache successfully resized.
tb-base40g:~ # lvconvert --type cache --cachevol giant-cache --cachemode
writeback --chunksize 256 test/giant
Erase all existing data on test/giant-cache? [y/n]: y
WARNING: repairing a damaged cachevol is not yet possible.
WARNING: cache mode writethrough is suggested for safe operation.
Continue using writeback without repair?y
Logical volume test/giant is now cached.
tb-base40g:~ # lvs -a
LV VG Attr LSize Pool Origin
Data% Meta% Move Log Cpy%Sync Convert
giant test Cwi-a-C--- 512.00g [giant-cache_cvol] [giant_corig]
0.01 14.86 0.00
[giant-cache_cvol] test Cwi-aoC--- 128.00g
[giant_corig] test owi-aoC--- 512.00g
tb-base40g:~ # rpm -qa | grep lvm2
lvm2-2.03.05-8.1.x86_64
lvm2-testsuite-2.03.05-7.2.x86_64
liblvm2cmd2_03-2.03.05-8.1.x86_64
```
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