Any progress on a defragmentation utility? We appear to be having a severe fragmentation problem on an X4500, vanilla S10U4, no additional patches. 500GB disks in 4 x 11 disk RAIDZ2 vdevs. It hit 97% full and fell off a cliff...about 50KB/sec on writes. Deleting files so the zpool is at 92% has not helped. I rebooted the host...no difference. I lowered the recordsize from 128KB to 8KB. That has boosted performance to 250-500KB/sec on writes (still 10x-100x too slow). Reads have been fine all along.
This is one big zpool and one file system of 16TB. Approximately 25-30M files, some of which change often. Lots of small, changing files, which are probably aggravating the problem. Due to the Marvell driver bug, I have SATA NCQ turned off in /etc/system via "set sata:sata_func_enable=0x5". We plan to go to the most recent patch set so I can remove that, but I'm not convinced patching will fix the slowness we're seeing. We'll try to delete more files, but having a defragmentation utility might help in this case. It seems a shame to waste 10-20% of your disk space to maintain moderate performance, though I guess that's what we'll have to do. This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
