Hi list, hoping for help, I'm experiencing a strange performance issue on debian squeeze. The host is running 2.6.32-5-amd64 on a Xen enterprise cluster, filesystem lies on a NetApp storage mounted using ISCSI. Other virtual hosts on that cluster does not have the same performance problems.
As soon as I start to copy i.e. a 2GB file local or to a remote host, the iowait is rising and the host feels jerking. sar reports %iowait > 60 Activating block_dump for a minute (echo 1 > /proc/sys/vm/block_dump) shows me that the process causing the iowait is jbd2 which is part of the ext4 filesystem. Any ideas howto tweak the fs for better performance? Regards Frank -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/1323768269.3674.28.ca...@nero.internal.friendscout24.de
