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@xxxxxxxxxx]
*Envoyé :* lundi 30 juin 2014 17:49
*À :* COCHE Sébastien; gluster-users@xxxxxxxxxxx
*Objet :* Re: 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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