Bug 501437

upstream in version 2.02.83

Fixed in lvm2-2.02.84-1.el5

We need to turn on snap of mirrors if this is going to be a back port of the RHEL6.1 version of this bug. Otherwise we need to state that exclusive cmirror snaps are not supported.

"Snapshots and mirrors may not yet be mixed."

Does it give a sensible message?

I don't think we will port snaps of mirrors in rhel5.  A note will be needed.

It does give a sensible message. So, I'll add the "needs tech notes" flag based on comment #12 and mark this feature verified for linear and stripe volumes only.

[root@grant-02 ~]# lvchange -aye grant/linear grant/stripe grant/mirror

[root@grant-02 ~]# lvs -a -o +devices
 LV                VG     Attr   LSize   Origin Snap% Log         Copy%  Devices
 linear            grant  -wi-a- 100.00M                                 /dev/sdb1(0)
 mirror            grant  mwi-a- 100.00M              mirror_mlog 100.00 mirror_mimage_0(0),mirror_mimage_1(0)
 [mirror_mimage_0] grant  iwi-ao 100.00M                                 /dev/sdb1(38)
 [mirror_mimage_1] grant  iwi-ao 100.00M                                 /dev/sdb2(13)
 [mirror_mlog]     grant  lwi-ao   4.00M                                 /dev/sdc3(0)
 stripe            grant  -wi-a- 104.00M                                 /dev/sdb1(25),/dev/sdb2(0)

# CLUSTER LINEAR WORKS
[root@grant-02 ~]# lvcreate -n snap1 -L 50M -s grant/linear
  Rounding up size to full physical extent 52.00 MB
  Logical volume "snap1" created

# CLUSTER STRIPE WORKS
[root@grant-02 ~]# lvcreate -n snap2 -L 50M -s grant/stripe
  Rounding up size to full physical extent 52.00 MB
  Logical volume "snap2" created

# CLUSTER MIRROR DOES NOT WORK
[root@grant-02 ~]# lvcreate -n snap3 -L 50M -s grant/mirror
  Rounding up size to full physical extent 52.00 MB
  Snapshots and mirrors may not yet be mixed.

[root@grant-02 ~]# lvs -a -o +devices
 LV                VG     Attr   LSize   Origin Snap% Log         Copy%  Devices
 linear            grant  owi-a- 100.00M                                 /dev/sdb1(0)
 mirror            grant  mwi-a- 100.00M              mirror_mlog 100.00 mirror_mimage_0(0),mirror_mimage_1(0)
 [mirror_mimage_0] grant  iwi-ao 100.00M                                 /dev/sdb1(38)
 [mirror_mimage_1] grant  iwi-ao 100.00M                                 /dev/sdb2(13)
 [mirror_mlog]     grant  lwi-ao   4.00M                                 /dev/sdc3(0)
 snap1             grant  swi-a-  52.00M linear  0.02                    /dev/sdb1(63)
 snap2             grant  swi-a-  52.00M stripe  0.02                    /dev/sdb1(76)
 stripe            grant  owi-a- 104.00M                                 /dev/sdb1(25),/dev/sdb2(0)

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http://rhn.redhat.com/errata/RHBA-2011-0986.html