[Pvfs2-users] Increase the number of IO servers

[Mike P Moore]

Hi Kyle,

  Thanks!  That answered my questions.  I didn't expect it to move 
existing files to the 
new servers dataspace.  I just wanted to make sure that the new server 
would get mixed
in with the existing ones.  I know our work load, and over time the total 
load would work it's
way around to all servers as we add new datasets and remove old ones.

Thanks again!

- Mike

Michael P. Moore
Senior Network Engineer
Applied Biosystems - High Throughput Discovery Division
P: 508-383-7486
ONNET: 685-7486




"Kyle Schochenmaier" <kschoche at gmail.com> 
Sent by: pvfs2-users-bounces at beowulf-underground.org
09/04/2008 03:56 PM

To
"Mike P Moore" <Mike.Moore at appliedbiosystems.com>
cc
pvfs2-users at beowulf-underground.org
Subject
Re: [Pvfs2-users] Increase the number of IO servers






Yes you can add an IO server to the filesystem by adding an additional
server entry to the config file and restarting all of the server
processes (since server processes get copies of the config file at
startup)
No you will not need to reformat the existing filesystem.
There is no mechanism to cause existing files (before you added
additional servers) to be moved to the new servers' dataspace.
However, by default all newly created files will be 'balanced' and put
on servers in a round-robin fashion to all servers in the filesystem.
If it was imperative that you rebalance existing files, I would copy
the files off of the filesystem to a scratch space and then copy them
back to the 'new' filesystem.  You can do this after you add the
servers and restart the server processes.  (I would highly recommend
pvfs2-cp if you have large files as regular 'cp' will be slow)

Hope that gets what you need taken care of.

Kyle

On Thu, Sep 4, 2008 at 2:25 PM, Mike P Moore
<Mike.Moore at appliedbiosystems.com> wrote:
>
> Hi,
>
>   Quick question that I can not seem to find an answer.  Can I add new 
IO
> server to an
> existing PVFS2 filesystem without reformatting the entire
> filesystem/corrupting the
> existing data?  Also, will it over time balance the load over the entire
> filesystem?
>
> Thanks!
>
> - Mike
>
> Michael P. Moore
> Senior Network Engineer
> Applied Biosystems - High Throughput Discovery Division
> P: 508-383-7486
> ONNET: 685-7486
>
> _______________________________________________
> Pvfs2-users mailing list
> Pvfs2-users at beowulf-underground.org
> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
>
>



-- 
Kyle Schochenmaier
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