I have seen some network recommendations for tuning a small storage server from the network side. I am currently using this set and wondered if there were other things I should be tweeking,
ndd -set /dev/tcp tcp_xmit_hiwat 1048576 ndd -set /dev/tcp tcp_recv_hiwat 8388608 ndd -set /dev/tcp tcp_max_buf 8388608 ndd -set /dev/udp udp_xmit_hiwat 1048576 ndd -set /dev/udp udp_recv_hiwat 8388608 ndd -set /dev/tcp tcp_conn_req_max_q 65536 ndd -set /dev/tcp tcp_conn_req_max_q0 65536 ndd -set /dev/tcp tcp_fin_wait_2_flush_interval 67500 ndd -set /dev/tcp tcp_naglim_def 1 I realize the UDP options have nothing to do with iSCSI, but I applied them anyway as it seemed to make sense. The machine I¹m using has a 8 drive RAIDZ-2 with 1 TB drives a quad core processor and 4 GB RAM. 98% of its load is as an iSCSI target for ESX. I do have write caching turned on and have verified that turning it off causes a significant write performance penalty. I currently am not using bonded NICS, but am using jumbo frames. Are there other things I should be tweeking? -- Terry Hull Network Resource Group, Inc.
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