[storage-discuss] Emulex HBA and COMSTAR

[Sumit Gupta]

Hi Sean

Did a quick test and using one port of an Emulex LP10K (2G FC) adapter 
as target in a direct attach mode (with A qlogic initiator) on a 2100z I 
am getting 170 MB/sec. The CPU utilization during the test was around 
10%. Can you post more details of the config and test case ? Also maybe 
Emulex has more ideas ?

# time dd if=/dev/rdsk/c8t600144F02C00000000003E4B8BC10005d0 
of=/dev/null bs=256k count=32768
32768+0 records in
32768+0 records out

real    0m48.41s
user    0m0.04s
sys    0m0.46s

Sumit

Sean ONeil wrote:
> I'm still having performance difficulties unfortunately.  I ran an local disk IO test with Filebench and the performance was great (aprox 500MB/s sequential read, 250MB/s write).  But using the same volume over Comstar FC the performance is 1/8th of that at best.
>
> On the target machine, whenever there's disk activity on the LU via FC target, the CPU spikes to 100% for a split second.  The desktop (mouse cursor, etc) doesn't respond during this brief moment.  And it repeats itself every 3 seconds or so as long as there's disk activity going on.
>
> I added more RAM and installed a new dual-core Opteron.  It didn't change anything.
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