It will require an available size according to the disk snapshot you're attempting to remove.
----- Original Message ----- From: "Rik Theys" <rik.th...@esat.kuleuven.be> To: "Elad Ben Aharon" <ebena...@redhat.com> Cc: users@ovirt.org Sent: Wednesday, 11 February, 2015 3:06:35 PM Subject: Re: [ovirt-users] Can't remove snapshot due to low disk space on storage domain? Hi, OK since my hosts are still CentOS 6.6, I will schedule downtime. Will removing it this way also require the additional disk space in the storage domain? Rik On 02/11/2015 02:03 PM, Elad Ben Aharon wrote: > Indeed, removing the disk snapshot from the 'Disk Snapshots' subtab will > remove only the snapshot of the disk, not the disk itself. > Regarding snapshot removal while the VM is running - this feature is > pretty new (live snapshot merge). AFAIK, this feature is tech preview > for 3.5. It also depends on the OS you're using on the hosts. RHEL 7.1 > supports it, but again, as tech preview. > Therefore, the safest way to remove the snapshot of the disk would be to > do it while the VM is not running. > > > ------------------------------------------------------------------------ > *From: *"Rik Theys" <rik.th...@esat.kuleuven.be> > *To: *"Elad Ben Aharon" <ebena...@redhat.com> > *Cc: *users@ovirt.org > *Sent: *Wednesday, 11 February, 2015 2:44:55 PM > *Subject: *Re: [ovirt-users] Can't remove snapshot due to low disk > space on storage domain? > > Hi, > > I created the snapshot on the Snapshots subtab of the Virtual machines > tab. I did this when my engine (and host) was running oVirt 3.4. It > is/was a snapshot of the entire VM (I deselected the memory state). > > I since upgraded the engine to 3.5. > > When I look at the snapshots subtab of the virtual machine, I see the > Current snapshot which is "Active VM" and the snapshot I created before. > This snapshot is a snapshot of both the OS and data disk. > > I can not delete the second snapshot when the VM is running. If I power > down the VM, I can't remove the snapshot as it brings up the error I > mentioned before. > > However, when I look at the disk snapshots subtab of the storage tab > (like you suggested), I see both disks with a snapshot and I can select > "Remove" there while the VM is running. Is it safe to remove them this > way? This will only remove the snapshot and not the disk (and data) from > my (running) VM? > > Regards, > > Rik > > > On 02/11/2015 01:26 PM, Elad Ben Aharon wrote: > > I'm not sure I understand which RHEV version you're using now. > > If you're using RHEV 3.5, it is possible to remove a snapshot of a > > single disk. > > You can do it via webadmin, Under the 'Disks Snapshots' subtab of the > > relevant storage domain, in the 'Storage' main tab. > > > > As for your second question, the free space has to be in the same > > storage domain. > > ------------------------------------------------------------------------ > > *From: *"Rik Theys" <rik.th...@esat.kuleuven.be> > > *To: *"Elad Ben Aharon" <ebena...@redhat.com> > > *Cc: *users@ovirt.org > > *Sent: *Wednesday, 11 February, 2015 2:10:13 PM > > *Subject: *Re: [ovirt-users] Can't remove snapshot due to low disk > > space on storage domain? > > > > Hi, > > > > Thats unfortunate :-(. It would have been great if oVirt told me during > > the creation of the snapshot that I would be unable to remove it later > > due to unsufficient free space in the storage domain :-). > > > > The VM has two disks - a small and a large one - so the snapshot > > contains both. Can I still remove the large disk while it has snapshots? > > > > Luckily the used disk space in the (preallocated) large disk is low > > enough so I can fit it on another temporary disk then. > > > > Does the free space have to be in the same storage domain, or can oVirt > > use another storage domain for the temporary volume? IOW, can I add an > > NFS storage domain which oVirt can use to create the temporary disk on? > > > > Regards, > > > > Rik > > > > > > On 02/11/2015 12:57 PM, Elad Ben Aharon wrote: > > > *equals or larger than the disk size > > > > > > > ------------------------------------------------------------------------ > > > *From: *"Elad Ben Aharon" <ebena...@redhat.com> > > > *To: *"Rik Theys" <rik.th...@esat.kuleuven.be> > > > *Cc: *users@ovirt.org > > > *Sent: *Wednesday, 11 February, 2015 12:18:35 PM > > > *Subject: *Re: [ovirt-users] Can't remove snapshot due to low disk > > > space on storage domain? > > > > > > Snapshot removal (merge) includes a create volume phase. This > volume is > > > temporary and gets removed once the snapshot merge is completed. Its > > > size is the size of the disk. > > > That means that in order to remove the snapshot, the storage domain > > > should have available size that is equal to the disk size. > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Elad Ben Aharon > > > RHEV-QE storage > > > > > > > > > > ------------------------------------------------------------------------ > > > *From: *"Rik Theys" <rik.th...@esat.kuleuven.be> > > > *To: *users@ovirt.org > > > *Sent: *Tuesday, 10 February, 2015 12:00:10 PM > > > *Subject: *[ovirt-users] Can't remove snapshot due to low disk space > > > on storage domain? > > > > > > Hi, > > > > > > I'm running the ovirt engine 3.4 series. I've created a snapshot > of a VM > > > with an OS and data disk before upgrading the machine. > > > > > > The upgrade went fine and I now want to remove the snapshot. > > > Unfortunately this fails with the error: > > > > > > "Cannot remove Snapshot. Low disk space on target Storage Domain > > > stadius-virt2_PERC." > > > > > > So I can't free disk space by removing the snapshot because I > don't have > > > enough space? > > > > > > When I look at the VM the disks are shown as preallocated (which > is what > > > I selected during installation). When I look at the storage tab > and list > > > the disks in my storage domain, the disks are now shown as thin > > > provisioned with the actual size > virtual size. > > > > > > How can I remove this snapshot? I don't have enough free disk space in > > > my storage domain to duplicate the data disk of my VM. > > > > > > Regards, > > > > > > Rik > > > > > > > > > -- > > > Rik Theys > > > System Engineer > > > KU Leuven - Dept. Elektrotechniek (ESAT) > > > Kasteelpark Arenberg 10 bus 2440 - B-3001 Leuven-Heverlee > > > +32(0)16/32.11.07 > > > ---------------------------------------------------------------- > > > <<Any errors in spelling, tact or fact are transmission errors>> > > > _______________________________________________ > > > Users mailing list > > > Users@ovirt.org > > > http://lists.ovirt.org/mailman/listinfo/users > > > > > > > > > _______________________________________________ > > > Users mailing list > > > Users@ovirt.org > > > http://lists.ovirt.org/mailman/listinfo/users > > > > > > > > > -- > > Rik Theys > > System Engineer > > KU Leuven - Dept. Elektrotechniek (ESAT) > > Kasteelpark Arenberg 10 bus 2440 - B-3001 Leuven-Heverlee > > +32(0)16/32.11.07 > > ---------------------------------------------------------------- > > <<Any errors in spelling, tact or fact are transmission errors>> > > > > > -- > Rik Theys > System Engineer > KU Leuven - Dept. Elektrotechniek (ESAT) > Kasteelpark Arenberg 10 bus 2440 - B-3001 Leuven-Heverlee > +32(0)16/32.11.07 > ---------------------------------------------------------------- > <<Any errors in spelling, tact or fact are transmission errors>> > -- Rik Theys System Engineer KU Leuven - Dept. Elektrotechniek (ESAT) Kasteelpark Arenberg 10 bus 2440 - B-3001 Leuven-Heverlee +32(0)16/32.11.07 ---------------------------------------------------------------- <<Any errors in spelling, tact or fact are transmission errors>>
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