[Gluster-users] Concurrent writes management.

[Milos Kozak]

Can you compare GlusterFS with OCFS or GFS2 in the sense of locking?


----
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
>>
>>
>>
>>
>> _______________________________________________
>> Gluster-users mailing list
>> Gluster-users at gluster.org  <mailto:Gluster-users at gluster.org>
>> http://supercolony.gluster.org/mailman/listinfo/gluster-users
>>
>
>
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://supercolony.gluster.org/mailman/listinfo/gluster-users
>