[OpenIndiana-discuss] ISCSI SSD Performance

[Ian Collins]

Grant Albitz wrote:
> Local dd results:
>
> write 268.343296 GB via dd, please wait...
> time dd if=/dev/zero of=/PSC.Net/dd.tst bs=2048000 count=131027
>
> 131027+0 records in
> 131027+0 records out
>
> real     3:09.8
> user        0.1
> sys      2:40.1
>
> 268.343296 GB in 189.8s = 1413.82 MB/s Write
>
>
> 131027+0 records in
> 131027+0 records out
> 268343296000 bytes (268 GB) copied, 146.209 s, 1.8 GB/s
>
> real    2m26.215s
> user    0m0.202s
> sys     2m24.469s
>
>
> so I am getting expected results locally. The network infrastructure is as follows:
>
> 2 esxi hosts with intel x520 10g Ethernet cards. They are directly connected via twinx cables to intel x520 network cards in the zfs box. So there is no switch in between. Mtu is set on the zfs host as well as the esxi hosts to 9000. Results from both esxi hosts are the same.
>
> Since I can get 700-800MBps write, you would assume the link could handle more than 350MBps read...
>
> There may be some vmware issue I am hitting, but I had the same setup before with slower disks and I netted better performance in vmware. Are there any settings in Comstar I can look at that could be causing this?

Have you tried the connecting to the volume form another IO host to 
eliminate vmware as the cause?

-- 
Ian.