Hi, we are trying to bump up the speed doing file transfers via a vswitch connected to a 10Gbit OSA.
There seems to be a lot of parameters having a significant impact on speed here. It's for getting best speed for a TSM Server backing up its own db2 database That lives on std eckd disk onto nfs mounted disks. Nfs mounts in fstab: 172.19.27.227:/tsmgot90_isfs_1000_q1000n /tsmgot90/stg/1 nfs vers=3,tcp,hard,intr,rsize=131072,wsize=131072,bg 0 0 z/VM Version 6 Release 3.0, Service Level 1502 (64-bit) RHEL Santiago 6.7 So far we have using a dd command got 158 MB/s: root@zlintcp2:/etc/modprobe.d# time dd if=/dev/zero of=/tsmgot90/stg/2/testfile bs=256K count=10100 10100+0 records in 10100+0 records out 2647654400 bytes (2.6 GB) copied, 16.7146 s, 158 MB/s real 0m17.410s user 0m0.003s sys 0m2.231s nfsiostat indicates to much cpu is used, not sure if it is true values. We would like to reach at least 200MB/s, preferably 300MB/s Anyone having experiences or hints and tips ? What is the actual limit here ? BR /Tore ________________________________________________ Tore Agblad zOpen, IT Services Volvo Group Headquarters Corporate Process & IT SE-405 08, Gothenburg Sweden E-mail: tore.agb...@volvo.com http://www.volvo.com/volvoit/global/en-gb/
