Roy Sigurd Karlsbakk wrote:
I get 200MB on a cold day and 500 on a nice one from this SAN. These 40-50MB/s seem really being limited by pvmove alone. Nothing else shows this limit. That's why I'm asking.
--- 200-500... impressive for a SAN... but considering the bandwidth you have to the box (4x1+10), I'd hope for at least 200 (what I get w/just a 10)... so must be some parallel TCP channels there... he.. What showed those speeds? I'm _guessing_, but its likely that pvmove is single threaded. So could be related to the I/O transfer size as @pattonme was touching on, since multi-threaded I/O can slow things down for local I/O when local I/O is in the .5-1GBps and higher range. Curious -- do you know your network's cards' MTU size? I know that even w/1Gb cards I got 2-4X speed improvement over standard 1500 packets (run 9000/9014 byte MTU's over local net). I'd have to look at the source for more info... -l _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
