[Pvfs2-users] OrangeFS on nodes with different storage space capacities.

[Becky Ligon]

Andrew:

Having two servers on the 2S machine should work fine, but it does depend
on the storage backend and how it is connected to the server.  If you are
using local storage, then you are correct in that having two servers
*could* be a performance hit; however, if you are using some sort of SAN,
then that statement may not be valid.  In our own environment, we had 4
servers running on one machine attached to a DDN device, and performance
was good.  How is your 2S storage attached?

Becky

On Mon, Feb 20, 2012 at 12:15 PM, Andrew Savchenko <bircoph at gmail.com>wrote:

> Hello,
>
> I'm setting up OrangeFS-2.8.5 on a small cluster with 5 nodes:
> 4 of them have an equal storage space available (let note it as 1S)
> and one node has a double size storage space available (2S).
>
> So I have 6S available, but 2S on a single node. What will be the best
> way to use this extra space for a data storage? As far as I
> understand, simple strip data distribution mode will just uniformly
> place all data and extra 1S space will never be used. Variable stripe
> will not help either, because of round-robin placement of the data
> groups.
>
> Basic distribution should help (though, I haven't tested this), but
> this will negate striping and will hurt I/O performance badly.
>
> The only solution I see is to setup two pvfs2-servers on 2S-capable
> system. But this setup will be somewhat troublesome and as far as I
> understand from documentation is not recommended.
>
> Any ideas how to solve this better? Hardware modifications are out of
> question.
>
> Best regards,
> Andrew Savchenko
>
> _______________________________________________
> Pvfs2-users mailing list
> Pvfs2-users at beowulf-underground.org
> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
>
>


-- 
Becky Ligon
OrangeFS Support and Development
Omnibond Systems
Anderson, South Carolina
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.beowulf-underground.org/pipermail/pvfs2-users/attachments/20120220/2ad85cae/attachment.htm