libvirt users - Mar 2016 - unable to create preallocated image with gluster protocol

Hi All,

When I tried to create preallocated image with gluster , I am unable to 
create one
The image gets created but not preallocated.

[root@ ]# qemu-img create -f qcow2 -o preallocation=full 
gluster://host1.lab.eng.blr.redhat.com/rep3vol/vm3.img 3G
Formatting 
'gluster://dhcp37-61.lab.eng.blr.redhat.com/rep3vol/newvm3.img', 
fmt=qcow2 size=3221225472 encryption=off cluster_size=65536 
preallocation='full'
Unknown option 'preallocation'

Is it a known issue ?

-- Satheesaran S

On Tuesday, March 8, 2016 3:44:46 PM, SATHEESARAN wrote:
> Hi All,
> 
> When I tried to create preallocated image with gluster , I am unable to
> create one
> The image gets created but not preallocated.
> 
> [root@ ]# qemu-img create -f qcow2 -o preallocation=full
> gluster://host1.lab.eng.blr.redhat.com/rep3vol/vm3.img 3G
> Formatting
> 'gluster://dhcp37-61.lab.eng.blr.redhat.com/rep3vol/newvm3.img',
> fmt=qcow2 size=3221225472 encryption=off cluster_size=65536
> preallocation='full'
> Unknown option 'preallocation'
> 
> Is it a known issue ?
PFA,

As discussed, I'm able to create this without any issue
(built qemu from source 'master'), If you are compiling it from source,
make sure you configure it with  option '--enable-glusterfs', which
enables gluster related full/metedata preallocation mode related API's.


# qemu-img create -f qcow2 -o preallocation=metadata
gluster://10.70.1.86/sample/test_metadata.qcow2 512M 2>&1 | tee
test_metadata.log
# qemu-img create -f qcow2 -o preallocation=full
gluster://10.70.1.86/sample/test_full.qcow2 512M 2>&1 | tee test_full.log

#/mnt $ ls -lh
total 8.6G
-rw------- 1 root root 513M Mar  9 08:19 test_full.qcow2
-rw------- 1 root root 513M Mar  9 08:19 test_metadata.qcow2

#/mnt $ du -sh ./*
513M    ./test_full.qcow2
268K    ./test_metadata.qcow2

In case if you are using pre-built binaries make sure they are built with above
option

--
Prasanna

> 
> -- Satheesaran S
>