Hi all Only recently I discovered that online migration seems to work for us now. CT on NFS or NFS mounted inside a CT is non-issue now.
We are running all our CTs on an NFS filesystem shared between hostnodes. While checkpointing and restoring works flawlessly with that setup, I noticed that "vzctl chkpnt CTID" writes slower to the NFS mount compared to a dd-write, for instance. 'dd if=/dev/zero of=/mnt/nfs/deleteme bs=1M' writes with approx. 70MB/s. 'iotop' shows that 'vzctl chkpnt CTID' writes with only 18MB/s to the same dir. However, the speed of writing is similar to the one of dd when I use the 'bs=8k' option for dd. This makes me assume that quite some write performance could be gained, if checkpointing would write bigger blocks at time. I haven't read the respective source code to confirm my assumption that small block sizes are used, as my skills are far too limited, but if that is really the case, wouldn't it make sense to use bigger writes in order to improve checkpointing performance? What do you think? Roman _______________________________________________ Users mailing list [email protected] http://lists.openvz.org/mailman/listinfo/users
