[Gluster-users] Concurrent writes management.

[Pranith Kumar Karampuri]

On 06/30/2014 09:40 PM, Milos Kozak wrote:
> Can you compare GlusterFS with OCFS or GFS2 in the sense of locking?
I don't know OCFS/GFS2 :-(. May be someone else from the list who knows 
OCFS/GFS2 can help.

Pranith
>
>
> ----
> I know OCFS and GFS are something else, but also allow multiple access 
> to one file at the same time..
>
> On 6/30/2014 12:07 PM, Pranith Kumar Karampuri wrote:
>>
>> On 06/30/2014 09:26 PM, COCHE Sébastien wrote:
>>>
>>> Thank you for your response.
>>>
>>> I understand that the file exist only one time on the volume. But it
>>> can be accessed in write, by many nodes (clients) at the same time.
>>>
>>> What’s happen in those case ?
>>>
>> Nothing bad will happen to the filesystem. But the file may not be
>> meaningful if the applications writing to it don't synchronize
>> overlapping concurrent writes with fcntl locks.
>>
>> Pranith
>>>
>>> *Sébastien Coché,*
>>>
>>> Architecte Infrastructure(DIP)
>>>
>>> SIGMA Informatique – _www.sigma.fr <http://www.sigma.fr/>_
>>>
>>> 8 rue Newton – CS 84533 – 44245 LA CHAPELLE SUR ERDRE CEDEX
>>>
>>> Tél : (+33) 2.53.48.92.57– Mob : 06 22 25 03 74
>>>
>>> *De :*Pranith Kumar Karampuri [mailto:pkarampu at redhat.com]
>>> *Envoyé :* lundi 30 juin 2014 17:49
>>> *À :* COCHE Sébastien; gluster-users at gluster.org
>>> *Objet :* Re: [Gluster-users] Concurrent writes management.
>>>
>>> On 06/30/2014 07:49 PM, COCHE Sébastien wrote:
>>>
>>>     Hello
>>>
>>>     I have a question regarding concurrent write.
>>>
>>>     How are manage those writes ? Is there a risk of data corruption ?
>>>
>>>     Is there a lock mechanism, against corruption ? If yes, how it 
>>> work ?
>>>
>>>     I already had a look to forum and documents but I did not found a
>>>     deep dive explanation.
>>>
>>> For plain distribute volumes there exists only one file in the volume
>>> with the data. All the operations on the file happen just like they
>>> happen on normal filesystem. For replicated/distributed replicated
>>> volumes there are internal locks taken by replication feature to avoid
>>> any in-consistencies.
>>> Please check
>>> https://github.com/gluster/glusterfs/blob/master/doc/features/afr-v1.md 
>>> to
>>> know more about it.
>>>
>>> Pranith
>>>
>>> Thank for your feedback
>>>
>>> Sorry for my poor english  ;-)
>>>
>>> Sebastien
>>>
>>>
>>>
>>>
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>>
>>
>>
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