Hi, we are running a ceph cluster with btrfs as it's base filesystem (kernel 3.0). At the beginning everything worked very well, but after a few days (2-3) things are getting very slow. When I look at the object store servers I see heavy disk-i/o on the btrfs filesystems (disk utilization is between 60% and 100%). I also did some tracing on the Cepp-Object-Store-Daemon, but I'm quite certain, that the majority of the disk I/O is not caused by ceph or any other userland process. When reboot the system(s) the problems go away for another 2-3 days, but after that, it starts again. I'm not sure if the problem is related to the kernel warning I've reported last week. At least there is no temporal relationship between the warning and the slowdown. Any hints on how to trace this would be welcome. Thanks, Christian -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
