I have been suffering with this issue for some time now - I have two Netapp 3020's clustered - one head with FC disks and one head with SATA disks. Same level of Ontap etc. - the lun on the FC head is performing real well, but the luns on the SATA head is really bad. My backups from SATA using esXpress is 1meg or less a second, but on the FC luns it comes at 18meg/sec, which is what the throttle is set at. My guests on SATA perform poorly too.
One major point of difference between the two (besides one being FC and one SATA) is these infernal messages in the ESX console I keep getting since the upgrade to 3.5 and the new iSCSI initiator -- they go non-stop, and I don't get them on the FC head. Anyone have any ideas?
Wed Apr 1 19:08:58 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx03-18778d0c at IP addr 172.18.250.33
Wed Apr 1 19:09:00 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx06-077d73bf at IP addr 172.18.250.36
Wed Apr 1 19:09:37 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx04-1d9d5218 at IP addr 172.18.250.34
Wed Apr 1 19:09:58 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx03-18778d0c at IP addr 172.18.250.33
Wed Apr 1 19:11:00 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx06-077d73bf at IP addr 172.18.250.36
Wed Apr 1 19:12:15 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx05-2ee7bcca at IP addr 172.18.250.35
Wed Apr 1 19:12:37 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx04-1d9d5218 at IP addr 172.18.250.34
Wed Apr 1 19:14:00 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx06-077d73bf at IP addr 172.18.250.36
Wed Apr 1 19:14:18 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx07-08308b02 at IP addr 172.18.250.37
Wed Apr 1 19:16:15 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx05-2ee7bcca at IP addr 172.18.250.35
Wed Apr 1 19:16:37 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx04-1d9d5218 at IP addr 172.18.250.34
Wed Apr 1 19:17:00 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx06-077d73bf at IP addr 172.18.250.36
Wed Apr 1 19:17:18 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx07-08308b02 at IP addr 172.18.250.37
Wed Apr 1 19:17:58 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx03-18778d0c at IP addr 172.18.250.33
Wed Apr 1 19:18:00 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx06-077d73bf at IP addr 172.18.250.36
Wed Apr 1 19:18:18 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx07-08308b02 at IP addr 172.18.250.37
Wed Apr 1 19:18:37 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx04-1d9d5218 at IP addr 172.18.250.34
Wed Apr 1 19:19:37 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx04-1d9d5218 at IP addr 172.18.250.34
Wed Apr 1 19:20:00 NZDT sgsata: iscsi.notice:notice: ISCSI: New session from initiator iqn.1998-01.com.vmware:akesx06-077d73bf at IP addr 172.18.250.36