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тАО10-15-2008 11:17 AM
тАО10-15-2008 11:17 AM
EVA8100 lousy read performance
This EVA is connected to Linux and Windows 2003 servers with Qlogic QMH2462 HBA. The LUNS show very different read performance with dd. The performance is generally twice better on the frist disk group although all 2 TB luns were create identically. We use the HP Qlogic driver with failover and load balancing enabled. Am I missing something?
for i in `lssd | awk '{print $1}'`; do echo $i; ./lmdd.linux if=/dev/$i of=/dev/null bs=4M count=2000; done
sda
8000.0000 MB in 88.1608 secs, 90.7433 MB/sec
sdb
8000.0000 MB in 38.6719 secs, 206.8687 MB/sec
sdc
8000.0000 MB in 43.1963 secs, 185.2011 MB/sec
sdd
8000.0000 MB in 43.2108 secs, 185.1389 MB/sec
sde
8000.0000 MB in 43.2491 secs, 184.9751 MB/sec
sdf
8000.0000 MB in 43.8267 secs, 182.5370 MB/sec
sdg
8000.0000 MB in 43.7166 secs, 182.9968 MB/sec
sdh
8000.0000 MB in 43.2994 secs, 184.7599 MB/sec
sdi
8000.0000 MB in 43.1783 secs, 185.2783 MB/sec
sdj
8000.0000 MB in 43.4021 secs, 184.3228 MB/sec
sdk
8000.0000 MB in 68.5391 secs, 116.7217 MB/sec
sdl
8000.0000 MB in 75.1867 secs, 106.4019 MB/sec
sdm
8000.0000 MB in 89.2745 secs, 89.6113 MB/sec
sdn
8000.0000 MB in 84.0652 secs, 95.1642 MB/sec
sdo
8000.0000 MB in 83.5998 secs, 95.6940 MB/sec
sdp
8000.0000 MB in 84.1919 secs, 95.0210 MB/sec
sdq
8000.0000 MB in 84.7010 secs, 94.4499 MB/sec
sdr
8000.0000 MB in 85.4065 secs, 93.6697 MB/sec
sds
8000.0000 MB in 85.0728 secs, 94.0371 MB/sec
sdt
8000.0000 MB in 80.7400 secs, 99.0835 MB/sec
sdu
8000.0000 MB in 78.8831 secs, 101.4159 MB/sec
sdv
8000.0000 MB in 77.6879 secs, 102.9762 MB/sec
sdw
8000.0000 MB in 77.6395 secs, 103.0404 MB/sec
sdx
8000.0000 MB in 78.2907 secs, 102.1832 MB/sec
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тАО10-15-2008 12:15 PM
тАО10-15-2008 12:15 PM
Re: EVA8100 lousy read performance
are you using the set preferred path EVA option to loadbalance the EVA controllers?
Are you using the host LVM (striping)?
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тАО10-15-2008 02:48 PM
тАО10-15-2008 02:48 PM
Re: EVA8100 lousy read performance
Yes we use the following parameters in /etc/modprobe.conf
alias scsi_hostadapter cciss
alias scsi_hostadapter1 qla2xxx_conf
alias scsi_hostadapter2 qla2xxx
alias scsi_hostadapter3 qla2300
alias scsi_hostadapter4 qla2400
options qla2xxx ql2xmaxqdepth=16 qlport_down_retry=30 ql2xloginretrycount=30 ql2xfailover=1 ql2xlbType=1 ql2xautorestore=0xa ConfigRequired=0
remove qla2xxx /sbin/modprobe -r --first-time --ignore-remove qla2xxx && { /sbin/modprobe -r --ignore-remove qla2xxx_conf; }
cat /etc/hp_qla2x00.conf
qdepth = 16
port_down_retry_count = 30
login_retry_count = 30
failover = 1
load_balancing = 1
auto_restore = 0xa
auto_compile = n
config_required = 0
We made two tests: one with no preferred path and one with odd luns on one controller and even luns on the other with failover/failback but we had strange results in both cases. We don't plan to use LVM but a third party product.
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тАО01-26-2009 11:29 PM
тАО01-26-2009 11:29 PM
Re: EVA8100 lousy read performance
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тАО01-26-2009 11:31 PM
тАО01-26-2009 11:31 PM
Re: EVA8100 lousy read performance
# echo
or edit /boot/grub/grub.conf and add elevator=noop