Testing iscsi and ocfs2: lost packets and freeze tests

I have iscsi , ocfs2, asmlib installed on Centos4 (based upon j.hunter's article on building an iscsi/rac system). I am trying to confirm that these layers are functioning correctly and will not pose problems when clusterware/asm/rac is installed.
What do you think of these test results?
1. simultaneoulsly copying files from each node to the iscsi shared storage causes lots of lost packets and one of the 2 nodes will spend most of its time blocked by the other.
2. Unplugging an ethernet cable causes the server to freeze after a few minutes. Plugging the cable back in does nothing to eleviate the hang problem.

For performance, you need to tune your core network buffers and tcp network buffers (namely the [rw]mem_(default|max) and tcp_[rw]mem values. And you need to have a Gigabit network for such performance.
For the hang situation, it looks like as if you are unplugging a SCSI device where it is not hot swappable. You can diagnose the problem using a serial console / netdump server / or Sysrq-w / Sysrq-T dumps.
Ozgur Yuksel
Enterprise Linux Support

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