Federicos patch for clustered snapshots
Hi all,
I am new to the list, so please bear with me.
This is from this list some 15 months ago:
Quoted 24 lines
Quoted 8 lines · Federico Simoncelli
Looking at the LVM2 code (LVM2.2.02.40,
tools/lvcreate.c:640):/* FIXME Allow exclusive activation. */
if (vg_is_clustered(vg)) {log_error("Clustered snapshots are not yet supported."); return 0;
}Quoted 4 lines
looks like there is no way to activate a snapshot in a clustered volume group. Is the documentation wrong?
Is there anyone actively working on the "exclusive activation" FIXME that is mentioned in the comment?Hi all,
I worked a little on this issue and I came up with a working patch for LVM2.2.02.32.
...
To be able to set the lv as exclusive you have to deactivate it on the other nodes with the command:# lvchange -aln /dev/vg00/lvol1
Quoted 7 lines
and then you can create the snapshot:
# lvcreate --size 100M --snapshot --name snap /dev/vg00/lvol1 Logical volume "snap" createdIt automatically takes care to set the lv device as exclusive (vgchange -aey). Can anyone review the patch?
I would be very interested in the outcome of this patch. Has it been reviewed, how was the result, are there binaries/source code I could deploy?
Any hint or help would be greatly appreciated.
Dirk