Hi All, Hope every one is doing great, busy with research. Any suggestions to this post is appreciated. DESC: We have bought new SAN EMC VNX 5300 / OEL / Broadcom CNA 10G / ISCI Lun Size 5**G Disk : 15k RPM * 13 disks Current IO calibaration results : START_TIME END_TIME MAX_IOPS MAX_MBPS MAX_PMBPS LATENCY NUM_PHYSICAL_DISKS ------------------------------ ------------------------------ ---------- ---------- ---------- ---------- ------------------ 28-FEB-12 03.26.15.587453 PM 28-FEB-12 03.33.53.600931 PM 4148 433 295 11 24 i observe that actual is not match or near to calculated. Can you please suggest some thoughts for imporvment. [root@srvpdb01 ~]# cat /etc/iscsi/iscsid.conf node.startup = automatic node.session.timeo.replacement_timeout = 120 node.conn[0].timeo.login_timeout = 15 node.conn[0].timeo.logout_timeout = 15 node.conn[0].timeo.noop_out_interval = 10 node.conn[0].timeo.noop_out_timeout = 15 node.session.initial_login_retry_max = 4 node.session.cmds_max = 128 node.session.queue_depth = 128 node.session.iscsi.InitialR2T = No node.session.iscsi.ImmediateData = Yes node.session.iscsi.FirstBurstLength = 16776192 node.session.iscsi.MaxBurstLength = 16776192 # the default is 131072 node.conn[0].iscsi.MaxRecvDataSegmentLength = 16776192 # the default is 32768 discovery.sendtargets.iscsi.MaxRecvDataSegmentLength = 16776192 node.conn[0].iscsi.HeaderDigest = None node.session.iscsi.FastAbort = No net.core.rmem_max = 1073741824 net.core.wmem_max = 1073741824 net.ipv4.tcp_rmem = 1048576 16777216 1073741824 net.ipv4.tcp_wmem = 1048576 16770216 1073741824 net.ipv4.tcp_mem = 1048576 16770216 1073741824 Above are my current operational parameters. Thanks, Vamshi .D -- //www.freelists.org/webpage/oracle-l