[Gluster-users] FORTRAN Codes and File I/O

[Harshavardhana]

Hi Brian,

    Can you share your volume files and log files? are you using NUFA
translator?.  Running "vasp" application codes on nufa based configuration
we have seen certain issues.

--
Harshavardhana

On Thu, Feb 11, 2010 at 11:29 PM, Brian Smith <brs at usf.edu> wrote:

> H
> i all,
>
> I'm running Gluster 3.0.0 on top of XFS and while running a FORTRAN code
> that works perfectly well on any other file system, I get runtime errors
> when trying to open files -- along the lines of:
>
> At line 386 of file main.f (unit = 18, file = '')
> Fortran runtime error: File 'CHGCAR' already exists
>
> Are there known issues with FORTRAN I/O and Gluster?  Is this some sort
> of caching artifact?  Its not a consistent problem as it only seems to
> happen when running jobs within my scheduling environment (I use SGE).
>
> Let me know if you need more info.
>
> Thanks in advance,
> -Brian
>
> --
> Brian Smith
> Senior Systems Administrator
> IT Research Computing, University of South Florida
> 4202 E. Fowler Ave. ENB204
> Office Phone: +1 813 974-1467
> Organization URL: http://rc.usf.edu
>
>
> On Thu, 2010-02-11 at 15:13 +0100, Eros Candelaresi wrote:
> > Hi,
> >
> > for my small webhosting (3 servers, more to come hopefully) I am
> > investigating cluster filesystems. I have seen a few now and I love the
> > flexibility that GlusterFS brings. Still I cannot see a way to adapt it
> > to suit my needs. I have the following hardware:
> > - Server #1 with 160GB S-ATA
> > - Server #2 with 2x 400GB S-ATA
> > - Server #3 with 2x 1,5TB S-ATA
> >
> > I am hoping to find a filesystem that fulfills the following
> requirements:
> > 1. POSIX compliant (Apache, Postfix, etc. will use it) - GlusterFS has it
> > 2. combine the harddisks of all servers into one single filesystem -
> > DHT/unify seem to do the job
> > 3. redundancy: have a copy of each single file on at least 2 machines
> > such that a single host may fail without people noticing - looks like
> > this may be achieved by having AFR below DHT/Unify
> > 4. after a server failure redundancy should automatically be recreated
> > (ie. create new copies of all files that only exist once after the crash)
> > 5. just throw in new hardware, connect it with the cluster and let the
> > filesystem take care of filling it with data
> >
> > Hadoop seems strong on points 2.-5. but fails in 1. and is unsuited for
> > small files. For GlusterFS however, I cannot see how to achieve 4.-5.
> > There always seems to be manual reconfiguration and data movement
> > involved, is this correct? Since most of the Wiki is still based on 2.0
> > and there is 3.0 out now, I may be missing something.
> >
> > Hoping for your comments.
> >
> > Thanks and regards,
> > Eros
> >
> >
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