ISCSI EMC OEL performance issue

From: Vamshi Damidi <dbaprimatics_at_gmail.com>
Date: Tue, 6 Mar 2012 11:19:37 -0500
Message-ID: <CAKshVhxtkrOstKu=saX-4VG33FFXAN1J-5R1vmHb5QUg5X9WOA_at_mail.gmail.com>

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_at_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

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Received on Tue Mar 06 2012 - 10:19:37 CST