RE: Problems with Open-iSCSI and Infortrend A16E-G2130-4

[Matthew Dickinson]

I’m also seeing similar issues on a RedHat 5.4 server, iscsi-initiator-utils-6.2.0.871-0.10.el5.

I’ve got a Dell Poweredge 2950 with a 2 port MLT using broadcom NICs to a Nortel 5510 swtich. My Infortrend S16E-R1130 unit is connected using 8 Gbig ports (it has 2 controllers) – it’s all on the same switch and same private IP subnet.

The storage is configured using the multipathd to load balance.

I’m seeing similar TCP “weirdness” as the other posts mention as  well as the below errors.

Nov  2 08:15:14 backup kernel:  connection28:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4295808782, last ping 4295813782, now 4295818782
Nov  2 08:15:14 backup kernel:  connection28:0: detected conn error (1011)
Nov  2 08:15:14 backup kernel:  connection27:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4295808790, last ping 4295813790, now 4295818790
Nov  2 08:15:14 backup kernel:  connection27:0: detected conn error (1011)
Nov  2 08:15:14 backup kernel:  connection33:0: ping timeout of 5 secs expired, recv timeout 5, last rx 4295808796, last ping 4295813796, now 4295818796
Nov  2 08:15:14 backup kernel:  connection33:0: detected conn error (1011)


The performance isn’t what I’d expect:

[root@backup backup]# dd if=/dev/zero of=test count=5000000
5000000+0 records in
5000000+0 records out
2560000000 bytes (2.6 GB) copied, 280.271 seconds, 9.1 MB/s

I just did a rudimentary test to see how Windows server 2008 would perform with the same storage, and configured to access just via one interface, I was able to sustain 20MB/s – so it would “appear” to be a Linux-related issue.

Matthew