Hi,
In short Cengiz, you're going to have to do a little work if you want
to turn off the precreate functionality and go back to the old way of
allocating metadata and data objects. That code isn't being tested or
supported any more; the new way of doing things is simply better for
most users. Another option would be to use an older version of PVFS
that does not have this feature.
Rob
On Jun 2, 2011, at 9:51 AM, Michael Moore wrote:
I checked a little closer in the create state machine. If I'm
reading it correctly, the only way to only get local file handles it
to have the stuffed option on. Otherwise, remote file handles will
be allocated and the only way those currently get populated is from
precreate pools. Of course testing the configuration is the only
definitive way to know where and if it breaks.
To change the reliance on precreate behavior my thought would be to
change the state machines that rely on
job_precreate_pool_get_handles() to have a different way to get
handles. In other words, based on some flag have the state machine
take one of two paths 1) get handles normally with precreate 2) the
old route. Now, I am not familiar with the 'old route' so I don't
know how well it would fit.
Michael
On Thu, Jun 2, 2011 at 8:39 AM, Phil Carns <[email protected]> wrote:
I share Michael's curiosity as well, but I think it might be
possible to disable the precreate functionality using config file
options if you really need to (not recommended):
Set the FileStuffing option to "no" to prevent the file system from
using the file stuffing optimization that relies on precreated
objects:
http://www.pvfs.org/cvs/pvfs-2-8-branch-docs/doc//pvfs-config-options.php#FileStuffing
And then also set the PrecreateLowThreshold to 0 to prevent the
servers from trying to fill up their respective pools of precreated
objects on startup:
http://www.pvfs.org/cvs/pvfs-2-8-branch-docs/doc//pvfs-config-options.php#PrecreateLowThreshold
I have never tried that particular configuration so I can't say for
sure if it will work or not.
-Phil
On 06/01/2011 09:52 PM, Michael Moore wrote:
Hi Cengiz,
I'm curious, what's the use case for needing the precreate
functionality disabled? Migration from an older version?
Thanks,
Michael
On Wed, Jun 1, 2011 at 3:01 PM, Karakoyunlu, Cengiz <[email protected]
> wrote:
Is it possible to disable the precreate functions in orangefs-2.8.4
and use the traditional methods existed in previous distributions
to start server, perform i/o operations etc.?
Thank you,
Cengiz
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