New subject: Can't remove snapshot due to low disk space on storage domain?

10 Feb 2015

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It will require an available size according to the disk snapshot you're attempting to remove. 

----- Original Message -----

From: "Rik Theys" <Rik.Theys@esat.kuleuven.be> 
To: "Elad Ben Aharon" <ebenahar@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.Theys@esat.kuleuven.be> 
> *To: *"Elad Ben Aharon" <ebenahar@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.Theys@esat.kuleuven.be> 
> > *To: *"Elad Ben Aharon" <ebenahar@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" <ebenahar@redhat.com> 
> > > *To: *"Rik Theys" <Rik.Theys@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.Theys@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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<html><body><div style=3D"font-family: times new roman, new york, times, se=
rif; font-size: 12pt; color: #000000"><div>It will require an available siz=
e according to the disk snapshot you're attempting to remove. <br></div><di=
v><br></div><div><br></div><hr id=3D"zwchr"><div style=3D"color:#000;font-w=
eight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,A=
rial,sans-serif;font-size:12pt;"><b>From: </b>"Rik Theys" <Rik.Theys@esa=
t.kuleuven.be><br><b>To: </b>"Elad Ben Aharon" <ebenahar@redhat.com&g=
t;<br><b>Cc: </b>users@ovirt.org<br><b>Sent: </b>Wednesday, 11 February, 20=
15 3:06:35 PM<br><b>Subject: </b>Re: [ovirt-users] Can't remove snapshot du=
e to low disk space        on stora=
ge domain?<br><div><br></div>Hi,<br><div><br></div>OK since my hosts are st=
ill CentOS 6.6, I will schedule downtime.<br><div><br></div>Will removing i=
t 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 t=
he disk itself.<br>> Regarding snapshot removal while the  VM is ru=
nning - this feature is<br>> pretty new (live snapshot merge). AFAIK, th=
is feature is tech preview<br>> for 3.5. It also depends on the OS you'r=
e using on the hosts. RHEL 7.1<br>> supports it, but again, as tech prev=
iew.<br>> Therefore, the safest way to remove the snapshot of the disk w=
ould be to<br>> do it while the VM is not running.<br>><br>><br>&g=
t; ------------------------------------------------------------------------=
<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>> *Subjec=
t: *Re: [ovirt-users] Can't remove snapshot due to low disk<br>> space &=
nbsp;      on storage domain?<br>><br>> Hi,<br>><br=
>> I created the snapshot on the Snapshots subtab of the Virtual machine=
s<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 stat=
e).<br>><br>> I since upgraded the engine to 3.5.<br>><br>> Whe=
n 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 powe=
r<br>> down the VM, I can't remove the snapshot as it brings up the erro=
r I<br>> mentioned before.<br>><br>> However, when I look at the d=
isk 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 t=
he VM is running. Is it safe to remove them this<br>> way? This will onl=
y remove the snapshot and not the disk (and data) from<br>> my (running)=
 VM?<br>><br>> Regards,<br>><br>> Rik<br>><br>><br>> O=
n 02/11/2015 01:26 PM, Elad Ben Aharon wrote:<br>>  > I'm not su=
re 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>> &nb=
sp;> single disk.<br>>  > You can do it via webadmin, Under t=
he 'Disks Snapshots' subtab of the<br>>  > relevant storage doma=
in, in the 'Storage' main tab.<br>>  ><br>>  > As for=
 your second question, the free space has to be in the same<br>>  &=
gt; storage domain.<br>>  > ------------------------------------=
------------------------------------<br>>  > *From: *"Rik Theys"=
 <Rik.Theys@esat.kuleuven.be><br>>  > *To: *"Elad Ben Ahar=
on" <ebenahar@redhat.com><br>>  > *Cc: *users@ovirt.org<br=
>>  > *Sent: *Wednesday, 11 February, 2015 2:10:13 PM<br>> &n=
bsp;> *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<b=
r>>  > the creation of the snapshot that I would be unable to re=
move it later<br>>  > due to unsufficient free space in the stor=
age domain :-).<br>>  ><br>>  > The VM has two disks =
- a small and a large one - so the snapshot<br>>  > contains bot=
h. Can I still remove the large disk while it has snapshots?<br>>  =
><br>>  > Luckily the used disk space in the (preallocated) l=
arge disk is low<br>>  > enough so I can fit it on another tempo=
rary disk then.<br>>  ><br>>  > Does the free space h=
ave to be in the same storage domain, or can oVirt<br>>  > use a=
nother storage domain for the temporary volume? IOW, can I add an<br>> &=
nbsp;> NFS storage domain which oVirt can use to create the temporary di=
sk on?<br>>  ><br>>  > Regards,<br>>  ><br=
>>  > Rik<br>>  ><br>>  ><br>>  &g=
t; On 02/11/2015 12:57 PM, Elad Ben Aharon wrote:<br>>  >  =
> *equals or larger than the disk size<br>>  >  ><br>=
>  >  ><br>> ----------------------------------------=
--------------------------------<br>>  >  > *From: *"Ela=
d 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>>  > &nb=
sp;> space        on        stor=
age domain?<br>>  >  ><br>>  >  > Sna=
pshot removal (merge) includes a create volume phase. This<br>> volume i=
s<br>>  >  > temporary and gets removed once the snapsho=
t 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>>  >  &g=
t;<br>>  >  ><br>>  >  ><br>> &nbs=
p;>  ><br>>  >  ><br>>  >  &g=
t;<br>>  >  ><br>>  >  ><br>> &nbs=
p;>  ><br>>  >  > Elad Ben Aharon<br>> &nb=
sp;>  > RHEV-QE storage<br>>  >  ><br>> &n=
bsp;>  ><br>>  >  ><br>> -----------------=
-------------------------------------------------------<br>>  > =
 > *From: *"Rik Theys" <Rik.Theys@esat.kuleuven.be><br>> &=
nbsp;>  > *To: *users@ovirt.org<br>>  >  > *S=
ent: *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>&g=
t;  >  ><br>>  >  > Hi,<br>>  &g=
t;  ><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>>  &=
gt;  ><br>>  >  > The upgrade went fine and I no=
w want to remove the snapshot.<br>>  >  > Unfortunately =
this fails with the error:<br>>  >  ><br>>  >=
  > "Cannot remove Snapshot. Low disk space on target Storage Domai=
n<br>>  >  > stadius-virt2_PERC."<br>>  > &nb=
sp;><br>>  >  > So I can't free disk space by removin=
g the snapshot because I<br>> don't have<br>>  >  > e=
nough space?<br>>  >  ><br>>  >  > Wh=
en I look at the VM the disks are shown as preallocated (which<br>> is w=
hat<br>>  >  > I selected during installation). When I l=
ook at the storage tab<br>> and list<br>>  >  > the d=
isks in my storage domain, the disks are now shown as thin<br>>  &g=
t;  > provisioned with the actual size > virtual size.<br>> &=
nbsp;>  ><br>>  >  > How can I remove this sn=
apshot? 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>&g=
t;  >  ><br>>  >  > --<br>>  >=
;  > Rik Theys<br>>  >  > System Engineer<br>>=
;  >  > KU Leuven - Dept. Elektrotechniek (ESAT)<br>> &n=
bsp;>  > Kasteelpark Arenberg 10 bus 2440  - B-3001 Leuven-=
Heverlee<br>>  >  > +32(0)16/32.11.07<br>>  >=
  > ---------------------------------------------------------------=
-<br>>  >  > <<Any errors in spelling, tact or fac=
t are transmission errors>><br>>  >  > ___________=
____________________________________<br>>  >  > Users ma=
iling 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>> &=
nbsp;>  > http://lists.ovirt.org/mailman/listinfo/users<br>> =
 >  ><br>>  ><br>>  ><br>>  &=
gt; --<br>>  > Rik Theys<br>>  > System Engineer<br>&=
gt;  > KU Leuven - Dept. Elektrotechniek (ESAT)<br>>  > =
Kasteelpark Arenberg 10 bus 2440  - B-3001 Leuven-Heverlee<br>> &nb=
sp;> +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>><b=
r>><br><div><br></div><br>-- <br>Rik Theys<br>System Engineer<br>KU Leuv=
en - 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>=
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------=_Part_9482614_1272915913.1423660680338--

Can't remove snapshot due to low disk space on storage domain?

Rik Theys

Elad Ben Aharon

Elad Ben Aharon

Rik Theys

Elad Ben Aharon

Rik Theys

Elad Ben Aharon

Rik Theys

Elad Ben Aharon

Ernest Beinrohr

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participants (3)