On Mon, Jul 9, 2018 at 5:41 PM, Hesham Ahmed <[email protected]> wrote:
> Thanks Sahina for the update, > > I am using gluster geo-replication for DR in a different installation, > however I was not aware that Gluster snapshots are not recommended in > a hyperconverged setup, don't. A warning on the Gluster snapshot UI > would be helpful. Is gluster volume snapshots for volumes hosting VM > images a work in progress with a bug tracker or it's something not > expected to change? > Agreed on the warning - can you log a bz? There's no specific bz tracking support for volume snapshots w.r.t VM store use case. If you have a specific scenario where the geo-rep based DR is not sufficient, please log a bug. On Mon, Jul 9, 2018 at 2:58 PM Sahina Bose <[email protected]> wrote: > > > > > > > > On Sun, Jul 8, 2018 at 3:29 PM, Hesham Ahmed <[email protected]> wrote: > >> > >> I also noticed that Gluster Snapshots have the SAME UUID as the main > >> LV and if using UUID in fstab, the snapshot device is sometimes > >> mounted instead of the primary LV > >> > >> For instance: > >> /etc/fstab contains the following line: > >> > >> UUID=a0b85d33-7150-448a-9a70-6391750b90ad /gluster_bricks/gv01_data01 > >> auto inode64,noatime,nodiratime,x-parent=dMeNGb-34lY-wFVL-WF42- > hlpE-TteI-lMhvvt > >> 0 0 > >> > >> # lvdisplay gluster00/lv01_data01 > >> --- Logical volume --- > >> LV Path /dev/gluster00/lv01_data01 > >> LV Name lv01_data01 > >> VG Name gluster00 > >> > >> # mount > >> /dev/mapper/gluster00-55e97e7412bf48db99bb389bb708edb8_0 on > >> /gluster_bricks/gv01_data01 type xfs > >> (rw,noatime,nodiratime,seclabel,attr2,inode64,sunit= > 1024,swidth=2048,noquota) > >> > >> Notice above the device mounted at the brick mountpoint is not > >> /dev/gluster00/lv01_data01 and instead is one of the snapshot devices > >> of that LV > >> > >> # blkid > >> /dev/mapper/gluster00-lv01_shaker_com_sa: > >> UUID="a0b85d33-7150-448a-9a70-6391750b90ad" TYPE="xfs" > >> /dev/mapper/gluster00-55e97e7412bf48db99bb389bb708edb8_0: > >> UUID="a0b85d33-7150-448a-9a70-6391750b90ad" TYPE="xfs" > >> /dev/mapper/gluster00-4ca8eef409ec4932828279efb91339de_0: > >> UUID="a0b85d33-7150-448a-9a70-6391750b90ad" TYPE="xfs" > >> /dev/mapper/gluster00-59992b6c14644f13b5531a054d2aa75c_0: > >> UUID="a0b85d33-7150-448a-9a70-6391750b90ad" TYPE="xfs" > >> /dev/mapper/gluster00-362b50c994b04284b1664b2e2eb49d09_0: > >> UUID="a0b85d33-7150-448a-9a70-6391750b90ad" TYPE="xfs" > >> /dev/mapper/gluster00-0b3cc414f4cb4cddb6e81f162cdb7efe_0: > >> UUID="a0b85d33-7150-448a-9a70-6391750b90ad" TYPE="xfs" > >> /dev/mapper/gluster00-da98ce5efda549039cf45a18e4eacbaf_0: > >> UUID="a0b85d33-7150-448a-9a70-6391750b90ad" TYPE="xfs" > >> /dev/mapper/gluster00-4ea5cce4be704dd7b29986ae6698a666_0: > >> UUID="a0b85d33-7150-448a-9a70-6391750b90ad" TYPE="xfs" > >> > >> Notice the UUID of LV and its snapshots is the same causing systemd to > >> mount one of the snapshot devices instead of LV which results in the > >> following gluster error: > >> > >> gluster> volume start gv01_data01 force > >> volume start: gv01_data01: failed: Volume id mismatch for brick > >> vhost03:/gluster_bricks/gv01_data01/gv. Expected volume id > >> be6bc69b-c6ed-4329-b300-3b9044f375e1, volume id > >> 55e97e74-12bf-48db-99bb-389bb708edb8 found > > > > > > > > We do not recommend gluster volume snapshots for volumes hosting VM > images. Please look at the https://ovirt.org/develop/ > release-management/features/gluster/gluster-dr/ as an alternative. > > > >> > >> On Sun, Jul 8, 2018 at 12:32 PM <[email protected]> wrote: > >> > > >> > I am facing this trouble since version 4.1 up to the latest 4.2.4, > once > >> > we enable gluster snapshots and accumulate some snapshots (as few as > 15 > >> > snapshots per server) we start having trouble booting the server. The > >> > server enters emergency shell upon boot after timing out waiting for > >> > snapshot devices. Waiting a few minutes and pressing Control-D then > boots the server normally. In case of very large number of snapshots (600+) > it can take days before the sever will boot. Attaching journal > >> > log, let me know if you need any other logs. > >> > > >> > Details of the setup: > >> > > >> > 3 node hyperconverged oVirt setup (64GB RAM, 8-Core E5 Xeon) > >> > oVirt 4.2.4 > >> > oVirt Node 4.2.4 > >> > 10Gb Interface > >> > > >> > Thanks, > >> > > >> > Hesham S. Ahmed > > > > >
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