We see a similar problem. We have a RAID < DRBD < LVM < EXT4 < NFS configuration that worked fine with Ubuntu 10.04. After upgrading to 12.04 LTS the performance dropped significantly. The clients block often, editing files is a pain and so on. We consider going back to Ubuntu 10.04.
We see a similar problem. We have a RAID < DRBD < LVM < EXT4 < NFS configuration that worked fine with Ubuntu 10.04. After upgrading to 12.04 LTS the performance dropped significantly. The clients block often, editing files is a pain and so on. We consider going back to Ubuntu 10.04.