[TripleO Wallaby] - Multi-attach Volume showing different files

Lokendra Rathour lokendrarathour at gmail.com
Mon Aug 29 16:46:25 UTC 2022


Thank you for the clarification.
Will check the approach suggested by you.

-Lokendra

On Mon, 29 Aug 2022, 21:53 Takashi Kajinami, <tkajinam at redhat.com> wrote:

> I'm afraid what you are trying is completely wrong.
> In case you need a shared file system then you should use a different
> technology like Manila.
>
> Multiattach in cinder allows multiple VMS to access the same block device
> data but it does
> NEVER provide any mechanism to guarantee consistency at file system level.
> Popular filesystems
> such as xfs never protect concurrent IO from multiple machines and If you
> mount the filesystem
> on the shared disk by multiple vms and write on it concurrently then you'd
> end up with a corrupted filesystem.
>
> Usually when you have multiattach-ed block devices then you need to
> implement a mechanism
> to prevent concurrent access (eg. Pacemaker)
>
>
>
> On Tue, Aug 30, 2022 at 1:06 AM Lokendra Rathour <
> lokendrarathour at gmail.com> wrote:
>
>> Hi Team,
>> It worked if I redo the VM creation with creation one more volume of
>> multi-attach type.
>> Thanks once again for the same.
>>
>> we can mark this thread as closed.
>>
>>
>> On Mon, Aug 29, 2022 at 11:18 AM Lokendra Rathour <
>> lokendrarathour at gmail.com> wrote:
>>
>>> Hi Team,
>>> On TripleO Wallaby deployment, I have tried creating multi-attach type
>>> volume, which if I am attaching this volume to two VM, it is getting
>>> attached.
>>> After mounting the same in each VM, if I am creating the folders in one
>>> VM at the mount path,
>>> I am not seeing the same on the other VM at the mount path
>>> [image: image.png]
>>>
>>> Ideally if the backend volume is same and if I am understanding the idea
>>> correctly, then the content should be same in both the location, as the
>>> back is same.
>>> Checking at horizon I also see that Volume is showing attached to both
>>> the VMs.
>>>
>>>
>>> [image: image.png]
>>>
>>> Document followed to create this:
>>> https://docs.openstack.org/cinder/latest/admin/volume-multiattach.html
>>>
>>> Please advice
>>>
>>> --
>>> ~ Lokendra
>>> skype: lokendrarathour
>>>
>>>
>>>
>>
>> --
>> ~ Lokendra
>> skype: lokendrarathour
>>
>>
>>
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