[Gluster-users] What should I do to improve performance ?

[Joe Topjian]

Just to clarify: the Cinder Gluster driver, which is comparable to the
Cinder NFS driver, uses FUSE:

https://github.com/openstack/cinder/blob/master/cinder/volume/drivers/glusterfs.py#L489-L499

Unless I'm mistaken, bootable volumes with Nova will use libgfapi (if
configured with qemu_allowed_storage_drivers), but the best ephemeral
instances can do is store the instances on a GlusterFS mounted
/var/lib/nova/instances.

We've also seen performance issues when running ephemeral instances on a
glusterfs mounted directory. However, we're using the Gluster Cinder driver
for volumes and have been mostly happy with it.

On Tue, Mar 24, 2015 at 9:22 AM, Joe Julian <joe at julianfamily.org> wrote:

> Nova ephemeral disks don't use libgfapi, only Cinder volumes.
>
> On March 24, 2015 7:27:52 AM PDT, marianna cattani <
> marianna.cattani at gmail.com> wrote:
>
>> Openstack doesn't have vsdm, it should be a configuration option:
>> "qemu_allowed_storage_drivers=gluster"
>>
>> But, however , the machine is generated with the xml that you see.
>>
>> Now I try to write to the OpenStack's mailing list .
>>
>> tnx
>>
>> M
>>
>> 2015-03-24 15:14 GMT+01:00 noc <noc at nieuwland.nl>:
>>
>>> On 24-3-2015 14:39, marianna cattani wrote:
>>> > Many many thanks !!!!
>>> >
>>> > Mine is different !!!!
>>> >
>>> > :'(
>>> >
>>> > root at nodo-4:~# virsh -r dumpxml instance-0000002c | grep disk
>>> >     <disk type='file' device='disk'>
>>> >       <source
>>> >
>>> file='/var/lib/nova/instances/ef84920d-2009-42a2-90de-29d9bd5e8512/disk'/>
>>> >       <alias name='virtio-disk0'/>
>>> >     </disk>
>>> >
>>> >
>>> Thats a fuse connection. I'm running ovirt + glusterfs where vdsm is a
>>> special version with libgfapi support. Don't know if Openstack has that
>>> too?
>>>
>>> Joop
>>>
>>>
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>>
> --
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>
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