[ovirt-users] GFS2 and OCFS2 for Shared Storage

[Charles Kozler]

Hey Fernando -

I've had success using OCFS2 with both oVirt and Xen although you still
need something to replicate the blocks and this is where DRBD comes in. The
premise was simple - configured two DRBD devices and then setup OCFS2 as
desired (very straight forward vs comparatively to GFS2). Start the cluster
and export via NFS. From there you create an oVirt storage domain as an NFS
backend and its good to go

On your note about using the network traffic for better stuff - eg: VM
traffic - its usually wise, when you have the capabilities, to keep your
storage network separate of VM network so in that you do not have any
latency between your VM nodes and their backend storage. Take for instance
if one VM starts crippling the network (in whatever scenario) then your
oVirt nodes and engine cannot contact storage. oVirt will begin to take
corrective action and will pause all of your VMs

On Wed, Nov 23, 2016 at 9:08 AM, Fernando Frediani <
fernando.frediani at upx.com.br> wrote:

> Right Pavel. Then where is it or where is the reference to it ?
>
> The only way I heard of is using Thinprovisioning in the SAN level.
>
> With regards to OCFS2 if anyone has any experience with I would like to
> hear about its sucess or not using it.
>
> Thanks
>
> Fernando
>
>
>
> On 23/11/2016 11:46, Pavel Gashev wrote:
>
>> Fernando,
>>
>> Clustered LVM doesn’t support lvmthin(7) http://man7.org/linux/man-page
>> s/man7/lvmthin.7.html
>> There is an oVirt LVM-based thin provisioning implementation.
>>
>> -----Original Message-----
>> From: Fernando Frediani <fernando.frediani at upx.com.br>
>> Date: Wednesday 23 November 2016 at 16:31
>> To: Pavel Gashev <Pax at acronis.com>, "users at ovirt.org" <users at ovirt.org>
>> Subject: Re: [ovirt-users] GFS2 and OCFS2 for Shared Storage
>>
>> Are you sure Pavel ?
>>
>> As far as I know and it has been discussed in this list before, the
>> limitation is in CLVM which doesn't support Thinprovisioning yet. LVM2
>> does, but it is not in Clustered mode. I tried to use GFS2 in the past
>> for other non-virtualization related stuff and didn't have much success
>> either.
>>
>> What about OCFS2 ? Has anyone ?
>>
>> Fernando
>>
>>
>> On 23/11/2016 11:26, Pavel Gashev wrote:
>>
>>> Fernando,
>>>
>>> oVirt supports thin provisioning for shared block storages (DAS or
>>> iSCSI). It works using QCOW2 disk images directly on LVM volumes. oVirt
>>> extends volumes when QCOW2 is growing.
>>>
>>> I tried GFS2. It's slow, and blocks other hosts on a host failure.
>>>
>>> -----Original Message-----
>>> From: <users-bounces at ovirt.org> on behalf of Fernando Frediani <
>>> fernando.frediani at upx.com.br>
>>> Date: Wednesday 23 November 2016 at 15:03
>>> To: "users at ovirt.org" <users at ovirt.org>
>>> Subject: [ovirt-users] GFS2 and OCFS2 for Shared Storage
>>>
>>> Has anyone managed to use GFS2 or OCFS2 for Shared Block Storage between
>>> hosts ? How scalable was it and which of the two work better ?
>>>
>>> Using traditional CLVM is far from good starting because of the lack of
>>> Thinprovision so I'm willing to consider either of the Filesystems.
>>>
>>> Thanks
>>>
>>> Fernando
>>>
>>> _______________________________________________
>>> Users mailing list
>>> Users at ovirt.org
>>> http://lists.ovirt.org/mailman/listinfo/users
>>>
>>>
>>>
>>
>>
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