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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(a)esat.kuleuven.be>
To: "Elad Ben Aharon" <ebenahar(a)redhat.com>
Cc: users(a)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(a)esat.kuleuven.be>
*To: *"Elad Ben Aharon" <ebenahar(a)redhat.com>
*Cc: *users(a)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(a)esat.kuleuven.be>
> *To: *"Elad Ben Aharon" <ebenahar(a)redhat.com>
> *Cc: *users(a)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(a)redhat.com>
> > *To: *"Rik Theys" <Rik.Theys(a)esat.kuleuven.be>
> > *Cc: *users(a)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(a)esat.kuleuven.be>
> > *To: *users(a)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(a)ovirt.org
> >
http://lists.ovirt.org/mailman/listinfo/users
> >
> >
> > _______________________________________________
> > Users mailing list
> > Users(a)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"
&lt;ebenahar(a)redhat.com&g=
t;<br><b>Cc: </b>users(a)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"
&lt;Rik.Theys(a)esat.kuleuven.be&gt;<br>&gt; *To=
: *"Elad Ben Aharon" &lt;ebenahar(a)redhat.com&gt;<br>&gt; *Cc:
*users(a)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"=
&lt;Rik.Theys(a)esat.kuleuven.be&gt;<br>&gt; > *To:
*"Elad Ben Ahar=
on" &lt;ebenahar(a)redhat.com&gt;<br>&gt; > *Cc:
*users(a)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" &lt;ebenahar(a)redhat.com&gt;<br>&gt;
> > *To=
: *"Rik Theys" &lt;Rik.Theys(a)esat.kuleuven.be&gt;<br>&gt;
> =
> *Cc: *users(a)ovirt.org<br>&gt; > >
*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"
&lt;Rik.Theys(a)esat.kuleuven.be&gt;<br>&gt; &=
nbsp;> > *To: *users(a)ovirt.org<br>&gt;
> > *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(a)ovirt.org<br>&gt; >=
>
http://lists.ovirt.org/mailman/listinfo/users<br>>
>=
; ><br>> >
><br>> > > __=
_____________________________________________<br>> >
>=
Users mailing list<br>> > >
Users(a)ovirt.org<br>&gt; &=
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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