Pointers to debugging slow iSCSI initiator performance

Viren R. Shah vshah at raytheonvtc.com
Tue Jun 21 15:49:16 UTC 2011


 

Folks

  I have a FreeBSD 8.1-STABLE system that I'm connecting via iSCSI to a
Compellent SAN. The iscsi-initiator works fine but is very slow and given
to periodic (very short) hangs.  The issue is that we have subversion on
it and it takes a long time to checkout some of our repos. Any pointers to
tweaking the config or figuring out the cause of the slowness is
appreciated. I haven't found many posts about the iscsi-initiator on
FreeBSD in my searches.

The config is below:

 

 

 

arachnophile# dd if=/dev/zero of=/san/test.out bs=1M count=2048

2048+0 records in

2048+0 records out

2147483648 bytes transferred in 145.111894 secs (14798812 bytes/sec)

 

 

arachnophile# uname -a

FreeBSD arachnophile.virtc.com 8.1-STABLE FreeBSD 8.1-STABLE #0: Wed Oct
13 13:52:31 EDT 2010
root at arachnophile.virtc.com:/usr/obj/usr/src/sys/ARACHNOPHILE  amd64

 

arachnophile# more /etc/iscsi.conf

compellent {

        initiatorname   =       arach

        TargetName      =
iqn.2002-03.com.compellent:50000d3100067001

        TargetAddress   =       172.30.0.10:3260,0

 

}

 

 

Hardware (in case it matters) is an IBM xSeries 346 

CPU: Intel(R) Xeon(TM) CPU 3.40GHz (3400.16-MHz K8-class CPU)

real memory  = 2147483648 (2048 MB)

 

 

arachnophile# netstat -I bge1

Name    Mtu Network       Address              Ipkts Ierrs Idrop    Opkts
Oerrs  Coll

bge1   1500 <Link#2>      00:14:5e:2b:39:7d 353438253     0     0
438355075     0     0

bge1   1500 172.30.0.0    172.30.0.66       353316523     -     -
438348928     -     -

 

Thanks

Viren Shah

vshah at raytheonvtc.com

 



More information about the freebsd-questions mailing list