[PVFS2-developers] kernel module problems

[Barry Robison]

On Mon, Mar 01, 2004 at 03:33:31PM -0600, neillm at mcs.anl.gov wrote:
> On Mon, Mar 01, 2004 at 01:24:37PM -0800, Barry Robison wrote:
> > [root at orca root]# mount -t pvfs2 pvfs2 /mnt/pvfs2
> > mount: wrong fs type, bad option, bad superblock on pvfs2,
> >        or too many mounted file systems
> 
> Please try mounting the pvfs2 kernel module by also specifying a
> collection id and a root handle.  An example syntax could look like:
> 
> mount -t pvfs2 pvfs2 /tmp/mnt -o coll_id=9,root_handle=1048576
> 
> [where coll_id is your fsid, and root_handle is the root handle value]
> 
> The error is admittedly not specific (unless you build the kernel
> module with debugging enabled) due to mount grouping all errors
> together.  This would be in mount's "bad option" error description.
> 
> Also, let me know if that fixes the problem you're seeing.  ;-)

yay this works!
   
and now for some performance related musings..
both servers are connected to decent fiber channel arrays
   
the VFS interface seems to slow things down quite a bit over the direct library interface:
   
[root at orca ....media]# pvfs2-import textfiles.com.tar.bz2 /mnt/pvfs2/textfiles.com.tar.bz2
PVFS2 Import Statistics:
********************************************************
Destination path (local): /mnt/pvfs2/textfiles.com.tar.bz2
Destination path (PVFS2 file system): /textfiles.com.tar.bz2
File system name: pvfs2-fs
Initial config server: tcp://orca:3334/pvfs2-fs
********************************************************
Bytes written: 715736057
Elapsed time: 27.244083 seconds
Bandwidth: 25.054214 MB/second
********************************************************
[root at orca ....media]# time cp textfiles.com.tar.bz2 /mnt/pvfs2/textfiles.com.tar.bz22

real    0m32.948s
user    0m0.000s
sys     0m6.790s




iozone dosn't really want to work on the pvfs2 mount reliably but some runs went ok

/mnt/pvfs2  <-- pvfs2 mount point
                 KB  reclen   write rewrite    read    reread
2048000     512   13715   13871    16152    15945

/mnt/storage/pvfs2  <-- pvfs2 storage space ( on FC drives )
     KB  reclen   write rewrite    read    reread
2048000     512   91200  121297    41751    42677

ouch!

will continuing playing around..

I want to use pvfs2 to distribute render assets to about 200 render nodes,
so let me know if there's anything I can do to help..


-- 
Barry Robison - brobison at deimos.org

Malice is rare.- Most people are far too much occupied with themselves to be
malicious.