Michael: Can you send me a screen shot of "top" from your servers when the metadata is running on the local disk? I'd like to see how much memory is available. I'm wondering if 1GB for your DB cache is too high, possibly causing excessive swapping.
Becky On Fri, May 24, 2013 at 6:06 PM, Michael Robbert <[email protected]> wrote: > We recently noticed a performance problem with our OrangeFS server. > > Here are the server stats: > 3 servers, built identically with identical hardware > > [root@orangefs02 ~]# /usr/sbin/pvfs2-server --version > 2.8.7-orangefs (mode: aio-threaded) > > [root@orangefs02 ~]# uname -r > 2.6.18-308.16.1.el5.584g0000 > > 4 core E5603 1.60GHz > 12GB of RAM > > OrangeFS is being served to clients using bmi_tcp over DDR Infiniband. > Backend storage is PanFS with 2x10Gig connections on the servers. > Performance to the backend looks fine using bonnie++. >100MB/sec write and > ~250MB/s read to each stack. ~300 creates/sec. > > On the OrangeFS clients are running kernel version 2.6.18-238.19.1.el5. > > The biggest problem I have right now is that delete are taking a long > time. Almost 1 sec per file. > > [root@fatcompute-11-32 L_10_V0.2_eta0.3_wRes_**truncerr1e-11]# find > N2/|wc -l > 137 > [root@fatcompute-11-32 L_10_V0.2_eta0.3_wRes_**truncerr1e-11]# time rm > -rf N2 > > real 1m31.096s > user 0m0.000s > sys 0m0.015s > > Similar results for file creates: > > [root@fatcompute-11-32 ]# date;for i in `seq 1 50`;do touch > file${i};done;date > Fri May 24 16:04:17 MDT 2013 > Fri May 24 16:05:05 MDT 2013 > > What else do you need to know? Which debug flags? What should we be > looking at? > I don't see any load on the servers and I've restarted server and rebooted > server nodes. > > Thanks for any pointers, > Mike Robbert > Colorado School of Mines > > > _______________________________________________ > Pvfs2-users mailing list > [email protected] > http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users > > -- Becky Ligon OrangeFS Support and Development Omnibond Systems Anderson, South Carolina
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