I am currently running IET on a CentOS 5.4 server with the following kernel:
Linux titan1 2.6.18-128.7.1.el5 #1 SMP Mon Aug 24 08:21:56 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux The server is a Dual quad core 2.8 GHz system with 16 GB ram. I am also using Coraid disk shelves via AoE for my block storage that I am offering up as a iscsi target. I am running v 0.4.17 of IET. I am getting very good write performance but lousy read performance. performing a simple sequential write to the iscsi target I get 94 megabytes per sec. With reads I am only getting 12.4 megabytes per sec. My ietd.conf looks like this: Target iqn.2009-11.net.storage:titan.diskshelf1.e1.2 Lun 1 Path=/dev/etherd/e1.2,Type=blockio Alias e1.2 MaxConnections 1 InitialR2T No ImmediateData Yes MaxRecvDataSegmentLength 262144 MaxXmitDataSegmentLength 262144 I have also made the following tweaks to tcp/ip: sysctl net.ipv4.tcp_rmem="1000000 1000000 1000000" sysctl net.ipv4.tcp_wmem="1000000 1000000 1000000" sysctl net.ipv4.tcp_tw_recycle=1 sysctl net.ipv4.tcp_tw_reuse=1 sysctl net.core.rmem_max=524287 sysctl net.core.wmem_max=524287 sysctl net.core.wmem_default=524287 sysctl net.core.optmem_max=524287 sysctl net.core.netdev_max_backlog=300000 I am using Broadcom cards in the iscsi target server. I have enabled jumbo rames on them (MTU 9000). They are connected directly into a windows server and I am accessing the iscsi target with MS iscsi initiator. The NIC cards on the Windows server are also set to a MTU of 9000. There is no switch in between, they are directly connected into the Windows server. I also notice that load averages on the Linux box will get into the 7's and 8's when I try pushing the system by performing multiple transfers. Any feedback on what I might be missing here would be great! Thanks Phil -- You received this message because you are subscribed to the Google Groups "open-iscsi" group. To post to this group, send email to open-is...@googlegroups.com. To unsubscribe from this group, send email to open-iscsi+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/open-iscsi?hl=.
