> I installed FreeBSD 7 a few days ago and upgraded to the latest stable > release using GENERIC kernel. I also added these entries to > /boot/loader.conf: > > vm.kmem_size="1536M" > vm.kmem_size_max="1536M" > vfs.zfs.prefetch_disable=1 > > Initially prefetch was enabled and I would experience hangs but after > disabling prefetch copying large amounts of data would go along > without problems. To see if FreeBSD 8 (current) had better (copy) > performance I upgraded to current as of yesterday. After upgrading and > rebooting the server responded fine. > > The server is a supermicro with a quad-core harpertown e5405 with two > internal sata-drives and 8 GB of ram. I installed an areca arc-1680 > sas-controller and configured it in jbod-mode. I attached an external > sas-cabinet with 16 sas-disks at 1 TB (931 binary GB). >
Replying to my own mail! :-) I believe I have found at least a work-around to alleviate this issue. First of all I upgraded to zfs ver. 11 by using Pawels patch. The upgrade itself does not solve any issue. Then I upgraded the firmware as advised by Areca-support. The firmware-upgrade has minor changes related to disk-temperature-reading and will probably not change anything either. I changed the configuration on each disk on the areca arc-1680-controller to passthrough-mode and rebooted. After re-creating the zpool I have not had any errors while copying 718 GB of small files from my solaris-nfs-server. I'm performing a local copy atm. and have 'zpool offline'd one disk and 'zpool replace'd with the spare. While the replace is in progress write-performance naturally takes a hit but the resilver-progress is progressing steadily and will use approx. 2 hours and 45 minutes in total to complete. -- regards Claus When lenity and cruelty play for a kingdom, the gentlest gamester is the soonest winner. Shakespeare _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "[EMAIL PROTECTED]"
