[ovirt-users] Can't remove snapshot due to low disk space on storage domain?

[Elad Ben Aharon]

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. 
----- Original Message -----

From: "Rik Theys" <Rik.Theys at esat.kuleuven.be> 
To: "Elad Ben Aharon" <ebenahar at redhat.com> 
Cc: users at 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" <ebenahar at redhat.com> 
> *To: *"Rik Theys" <Rik.Theys at esat.kuleuven.be> 
> *Cc: *users at 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.Theys at esat.kuleuven.be> 
> *To: *users at 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>> 
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> 
> 
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-- 
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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