I recently installed openindiana 151a to experiment with comstar and ZFS. Actually my setup is comprised of:
Target: Core 2 Quad Q8200 4 GB RAM 1x 1TB WD Raid Edition (not mirrored, yet) 1x OCZ Colossus, 80GB, used as L2ARC 1x LP9802 running in target mode Initiator: Linux 2.6 (Debian 5.0) 4 GB RAM 2x Dual Core XEON 2.8GHZ 1x QLA2312 used as initiator The target and the initiator are both connected to a brocade 2800 switch. I managed to get everything work correctly, I can create LU's on the storage, the initiator sees 'em...so far so good; but I'm encountering a weird (for me) issue. When the LUN is provisioned for the first time, by means of creating a ZVOL, sbdadm create-lu, adding the view etc, I get the expected behaviour: writes to the device on the initiator side (with dd, for example) are producing only writes to the pool's disks (confirmed with "zpool iostat"). When writing to the device again, performance is considerably lower...after investigating a bit, I saw a lot of reads...example: capacity operations bandwidth pool alloc free read write read write ---------- ----- ----- ----- ----- ----- ----- rpool 24,0G 904G 137 254 142K 31,1M c3d0s0 24,0G 904G 137 254 142K 31,1M cache - - - - - - c9d0s0 27,1G 92,1G 0 0 0 0 ---------- ----- ----- ----- ----- ----- ----- Is this expected ? Regards, Simone. ------------------------------------------- illumos-discuss Archives: https://www.listbox.com/member/archive/182180/=now RSS Feed: https://www.listbox.com/member/archive/rss/182180/21175430-2e6923be Modify Your Subscription: https://www.listbox.com/member/?member_id=21175430&id_secret=21175430-6a77cda4 Powered by Listbox: http://www.listbox.com
