Open Source iSCSI target; should I use EIT or SCWIST?

I got recently EIT work w / my ESXi vmhost but I've seen many posts recommending SCWIST on EIT while I was debugging my current setup. Is that still correct? I know, there is an a there, but most people stay away from this one due to poor performance compared to SCWIST & EIT.

Is difficult to get running SCWIST and y at - it tricks I should know about advance (example: EIT really needs to use BLOCKIO vs FILEIO and you really want to change the/sys/block / < device > Scheduler/queue / delay vs qfc.) I saw a HUGE jump in performance by changing it yourself!)

Finally, I use 6 GB NIC on the SAN w / 5 in an interface blocked using the ALB load balancing. Is it better to break up network cards and assign them static IPs w / in the same subnet so that my ESXi box using MPIO w / multiple vmks can have multiple paths to the target?

I read the excellent post from Chad here btw. ! It has been extremely helpful, and if I never met the guy, I'll buy him a beer!

Thanks for your help!

-Jeff

Just for laughs, here's my current setup:

Switch: HP Procurve 2810 - 24G. Flow & Jumbo frames control. Unfortunately, as most have already found, not at the same time. Currently, using any flow control on ports of SAN VLAN.

vmhost: ESXi 4.1 using 4 Gb NIC w / 3 of them to use SAN. I created 1 vSwitch w / 3 vmks as Chad says. I use RoundRobin to my PSP w / type = bytes, bytes = 11. I got the best performance w / cela versus RoundRobin w / type = IOPS / s and IOPS / s = 1. Currently have 3 paths of target. With EIT, I saw a throughput higher than 210MBps w / two VM Win7 guests running HD tune at the same time.

SAN: Using a card Adaptec RAID 3805 w / 8-500 GB Samsung HDs. OS is OpenSUSE 11.2 w / software iscsitarget (EIT he dunno the version.) A 6 GB NIC w / 5 GB NIC in a bonded interface. Seriously, I'm pointing out the additional latency of servile inteface if my boxes of vmhosts using MPIO can make the roundrobin on the iSCSI initiators!

I really didn't do a lot of work with nic bonding on linux target. I don't think that one advantage is really gained in this scenario to have NIC glued to load balance the traffic like that logic should be supported by esx host MPIO is implemented on the host.

Tags: VMware

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