[OpenAFS] OpenAFS speed

[Derek Atkins]

I don't know.. 3.9MB/sec is doing pretty well, IMHO ;)

-derek

Hartmut Reuter <reuter@rzg.mpg.de> writes:

> There are several possible reasons for slow file transfer. To find out
> which ones are important I would try the following tests:
> 
> 1) Find out how fast your RAID system is by creating a /vicepa/tmp and
> writing your file directly in there. But be sure your program does a
> fsync() call otherwise you only measure how fast it writes into the
> I/O buffers. The RAID 5 performance should be at least 30 MB/s, good
> IDE-RAID5 systems go up to 100 MB/s
> 
> 2) The client cache: the local disk on the client may be not very fast
> and also already busy by other activities on the machine. I found best
> results using a ramdisk cache. In our Linux-cluster with Gbit Ethernet
> and ramdisk cache I see transfer rates of > 25 MB/s into AFS.
> 
> 3) Net topology and load. What do you get out of "iperf" between your
> client and server?
> 
> All 3 results combined may explain the slow transfer rate.
> 
> -Hartmut
> 
> Lukas Kubin schrieb:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> > I'm running OpenAFS version 1.2.9-2 (Debian package) on a 2-processor
> > machine, where "vicepa" is on RAID5 (Adaptec) container installed. The
> > filesystem used is ext3.
> > When I try to write one 700 MB large file to AFS, it takes more than 3
> > minutes to complete. I tried this both locally (by generating the file
> > with "dd" from /dev/zero) and through 100 Mbps network. The result was the
> > same.
> > Is this normal feature of AFS or do I have to do some tuning?
> > Thank you.
> > lukas
> > - -- 
> > Lukas Kubin
> > phone: +420596398285
> > email: kubin@opf.slu.cz
> > Information centre
> > The School of Business Administration in Karvina
> > Silesian University in Opava
> > Czech Republic
> > http://www.opf.slu.cz
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> 
> -- 
> -----------------------------------------------------------------
> Hartmut Reuter                           e-mail reuter@rzg.mpg.de
> 					   phone +49-89-3299-1328
> RZG (Rechenzentrum Garching)               fax   +49-89-3299-1301
> Computing Center of the Max-Planck-Gesellschaft (MPG) and the
> Institut fuer Plasmaphysik (IPP)
> -----------------------------------------------------------------
> 
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord@MIT.EDU                        PGP key available