Hi, I'm not familiar with ZFS stuff, so I'll try to give you as much as info I can get with our environment We are using a ZFS pool as a VLS for a backup server (Sun V445 Solaris 10), and we are faced with very low read performance (whilst write performance is much better, i.e : up to 40GB/h to migrate data onto LTO-3 tape from disk, and up to 100GB/h to unstage data from LTO-3 tape to disk, either with Time Navigator 4.2 software or directly using dd commands) We have tunned ZFS parameters for ARC and disabled preftech but performance is poor. If we dd from disk to RAM or tape, it's very slow, but if we dd from tape or RAM to disk, it's faster. I can't figure out why. I've read other posts related to this, but I'm not sure what can of tuning can be made. For disks concern, I have no idea on how our System team created the ZFS volume. Can you help ?
Thank you David _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
