<html><body><div style="font-family: times new roman, new york, times, serif; font-size: 12pt; color: #000000"><div>It will require an available size according to the disk snapshot you're attempting to remove. <br></div><div><br></div><div><br></div><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>From: </b>"Rik Theys" <Rik.Theys@esat.kuleuven.be><br><b>To: </b>"Elad Ben Aharon" <ebenahar@redhat.com><br><b>Cc: </b>users@ovirt.org<br><b>Sent: </b>Wednesday, 11 February, 2015 3:06:35 PM<br><b>Subject: </b>Re: [ovirt-users] Can't remove snapshot due to low disk space on storage domain?<br><div><br></div>Hi,<br><div><br></div>OK since my hosts are still CentOS 6.6, I will schedule downtime.<br><div><br></div>Will removing it this way also require the additional disk space in the <br>storage domain?<br><div><br></div>Rik<br><div><br></div><br>On 02/11/2015 02:03 PM, Elad Ben Aharon wrote:<br>> Indeed, removing the disk snapshot from the 'Disk Snapshots' subtab will<br>> remove only the snapshot of the disk, not the disk itself.<br>> Regarding snapshot removal while the VM is running - this feature is<br>> pretty new (live snapshot merge). AFAIK, this feature is tech preview<br>> for 3.5. It also depends on the OS you're using on the hosts. RHEL 7.1<br>> supports it, but again, as tech preview.<br>> Therefore, the safest way to remove the snapshot of the disk would be to<br>> do it while the VM is not running.<br>><br>><br>> ------------------------------------------------------------------------<br>> *From: *"Rik Theys" <Rik.Theys@esat.kuleuven.be><br>> *To: *"Elad Ben Aharon" <ebenahar@redhat.com><br>> *Cc: *users@ovirt.org<br>> *Sent: *Wednesday, 11 February, 2015 2:44:55 PM<br>> *Subject: *Re: [ovirt-users] Can't remove snapshot due to low disk<br>> space on storage domain?<br>><br>> Hi,<br>><br>> I created the snapshot on the Snapshots subtab of the Virtual machines<br>> tab. I did this when my engine (and host) was running oVirt 3.4. It<br>> is/was a snapshot of the entire VM (I deselected the memory state).<br>><br>> I since upgraded the engine to 3.5.<br>><br>> When I look at the snapshots subtab of the virtual machine, I see the<br>> Current snapshot which is "Active VM" and the snapshot I created before.<br>> This snapshot is a snapshot of both the OS and data disk.<br>><br>> I can not delete the second snapshot when the VM is running. If I power<br>> down the VM, I can't remove the snapshot as it brings up the error I<br>> mentioned before.<br>><br>> However, when I look at the disk snapshots subtab of the storage tab<br>> (like you suggested), I see both disks with a snapshot and I can select<br>> "Remove" there while the VM is running. Is it safe to remove them this<br>> way? This will only remove the snapshot and not the disk (and data) from<br>> my (running) VM?<br>><br>> Regards,<br>><br>> Rik<br>><br>><br>> On 02/11/2015 01:26 PM, Elad Ben Aharon wrote:<br>> > I'm not sure I understand which RHEV version you're using now.<br>> > If you're using RHEV 3.5, it is possible to remove a snapshot of a<br>> > single disk.<br>> > You can do it via webadmin, Under the 'Disks Snapshots' subtab of the<br>> > relevant storage domain, in the 'Storage' main tab.<br>> ><br>> > As for your second question, the free space has to be in the same<br>> > storage domain.<br>> > ------------------------------------------------------------------------<br>> > *From: *"Rik Theys" <Rik.Theys@esat.kuleuven.be><br>> > *To: *"Elad Ben Aharon" <ebenahar@redhat.com><br>> > *Cc: *users@ovirt.org<br>> > *Sent: *Wednesday, 11 February, 2015 2:10:13 PM<br>> > *Subject: *Re: [ovirt-users] Can't remove snapshot due to low disk<br>> > space on storage domain?<br>> ><br>> > Hi,<br>> ><br>> > Thats unfortunate :-(. It would have been great if oVirt told me during<br>> > the creation of the snapshot that I would be unable to remove it later<br>> > due to unsufficient free space in the storage domain :-).<br>> ><br>> > The VM has two disks - a small and a large one - so the snapshot<br>> > contains both. Can I still remove the large disk while it has snapshots?<br>> ><br>> > Luckily the used disk space in the (preallocated) large disk is low<br>> > enough so I can fit it on another temporary disk then.<br>> ><br>> > Does the free space have to be in the same storage domain, or can oVirt<br>> > use another storage domain for the temporary volume? IOW, can I add an<br>> > NFS storage domain which oVirt can use to create the temporary disk on?<br>> ><br>> > Regards,<br>> ><br>> > Rik<br>> ><br>> ><br>> > On 02/11/2015 12:57 PM, Elad Ben Aharon wrote:<br>> > > *equals or larger than the disk size<br>> > ><br>> > ><br>> ------------------------------------------------------------------------<br>> > > *From: *"Elad Ben Aharon" <ebenahar@redhat.com><br>> > > *To: *"Rik Theys" <Rik.Theys@esat.kuleuven.be><br>> > > *Cc: *users@ovirt.org<br>> > > *Sent: *Wednesday, 11 February, 2015 12:18:35 PM<br>> > > *Subject: *Re: [ovirt-users] Can't remove snapshot due to low disk<br>> > > space on storage domain?<br>> > ><br>> > > Snapshot removal (merge) includes a create volume phase. This<br>> volume is<br>> > > temporary and gets removed once the snapshot merge is completed. Its<br>> > > size is the size of the disk.<br>> > > That means that in order to remove the snapshot, the storage domain<br>> > > should have available size that is equal to the disk size.<br>> > ><br>> > ><br>> > ><br>> > ><br>> > ><br>> > ><br>> > ><br>> > ><br>> > ><br>> > > Elad Ben Aharon<br>> > > RHEV-QE storage<br>> > ><br>> > ><br>> > ><br>> ------------------------------------------------------------------------<br>> > > *From: *"Rik Theys" <Rik.Theys@esat.kuleuven.be><br>> > > *To: *users@ovirt.org<br>> > > *Sent: *Tuesday, 10 February, 2015 12:00:10 PM<br>> > > *Subject: *[ovirt-users] Can't remove snapshot due to low disk space<br>> > > on storage domain?<br>> > ><br>> > > Hi,<br>> > ><br>> > > I'm running the ovirt engine 3.4 series. I've created a snapshot<br>> of a VM<br>> > > with an OS and data disk before upgrading the machine.<br>> > ><br>> > > The upgrade went fine and I now want to remove the snapshot.<br>> > > Unfortunately this fails with the error:<br>> > ><br>> > > "Cannot remove Snapshot. Low disk space on target Storage Domain<br>> > > stadius-virt2_PERC."<br>> > ><br>> > > So I can't free disk space by removing the snapshot because I<br>> don't have<br>> > > enough space?<br>> > ><br>> > > When I look at the VM the disks are shown as preallocated (which<br>> is what<br>> > > I selected during installation). When I look at the storage tab<br>> and list<br>> > > the disks in my storage domain, the disks are now shown as thin<br>> > > provisioned with the actual size > virtual size.<br>> > ><br>> > > How can I remove this snapshot? I don't have enough free disk space in<br>> > > my storage domain to duplicate the data disk of my VM.<br>> > ><br>> > > Regards,<br>> > ><br>> > > Rik<br>> > ><br>> > ><br>> > > --<br>> > > Rik Theys<br>> > > System Engineer<br>> > > KU Leuven - Dept. Elektrotechniek (ESAT)<br>> > > Kasteelpark Arenberg 10 bus 2440 - B-3001 Leuven-Heverlee<br>> > > +32(0)16/32.11.07<br>> > > ----------------------------------------------------------------<br>> > > <<Any errors in spelling, tact or fact are transmission errors>><br>> > > _______________________________________________<br>> > > Users mailing list<br>> > > Users@ovirt.org<br>> > > http://lists.ovirt.org/mailman/listinfo/users<br>> > ><br>> > ><br>> > > _______________________________________________<br>> > > Users mailing list<br>> > > Users@ovirt.org<br>> > > http://lists.ovirt.org/mailman/listinfo/users<br>> > ><br>> ><br>> ><br>> > --<br>> > Rik Theys<br>> > System Engineer<br>> > KU Leuven - Dept. Elektrotechniek (ESAT)<br>> > Kasteelpark Arenberg 10 bus 2440 - B-3001 Leuven-Heverlee<br>> > +32(0)16/32.11.07<br>> > ----------------------------------------------------------------<br>> > <<Any errors in spelling, tact or fact are transmission errors>><br>> ><br>><br>><br>> --<br>> Rik Theys<br>> System Engineer<br>> KU Leuven - Dept. Elektrotechniek (ESAT)<br>> Kasteelpark Arenberg 10 bus 2440 - B-3001 Leuven-Heverlee<br>> +32(0)16/32.11.07<br>> ----------------------------------------------------------------<br>> <<Any errors in spelling, tact or fact are transmission errors>><br>><br><div><br></div><br>-- <br>Rik Theys<br>System Engineer<br>KU Leuven - Dept. Elektrotechniek (ESAT)<br>Kasteelpark Arenberg 10 bus 2440 - B-3001 Leuven-Heverlee<br>+32(0)16/32.11.07<br>----------------------------------------------------------------<br><<Any errors in spelling, tact or fact are transmission errors>><br></div><div><br></div></div></body></html>