We have a devtype=file stgpool that is on NAS disk, accessed via NFS,
and we're getting very slow performance with TSM reading or writing it.
In a test, the Unix cp command moved data about 5 times faster than TSM
Migration.
I have been adjusting the number of migration processes up and down,
while watching network data flow numbers with topas, trying to get
clues. There comes a point, that processor wait time goes over 90%, and
then it hits a wall. The maximum seems to be about 10Mbytes/sec on a
point-to-point network consisting of three trunked GigE connections. A
single Unix cp command could write about 48Mbytes/sec, to the same NFS
filesystem, on the same NFS server, across the same network.
Anybody else faced this kind of issue?
Roger Deschner University of Illinois at Chicago rog...@uic.edu
Academic Computing & Communications Center
