Server: T5120 on 10 U5 Storage: Internal 8 drives on SAS HW RAID (R5) Oracle: ZFS fs, recordsize=8K and atime=off Tape: LTO-4 (half height) on SAS interface.
Dumping a large file from memory using tar to LTO yields 44 MB/s ... I suspect the CPU cannot push more since it's a single thread doing all the work. Dumping oracle db files from filesystem yields ~ 25 MB/s. The interesting bit (apart from it being a rather slow speed) is the fact that the speed fluctuates from the disk area.. but stays constant to the tape. I see up to 50-60 MB/s spikes over 5 seconds, while the tape continues to push it's steady 25 MB/s. There has been NO tuning .. above is absolutely standard. Where should I investigate to increase throughput ... -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
