[OpenIndiana-discuss] Comstar Fibre Channel Target

[Liam Slusser]

I have a few ZFS servers (OI and OmniOS) that are fibre Channel targets.  I
use the qLogic 2562 8g dualport FC HBA card in all of them with great
success.

One of my systems is similar to yours, with 2 x (12 x 4T SAS) attached via
a LSI 9207-8e SAS HBA.  I am able to saturate both 8gb fibre channel
connections with a single host.

My target is a Sun/Oracle T4 system running Oracle Solaris 10 also with a
qLogic 2562.  I generally use a small block size (8k) since I only use
these servers for an Oracle RDBMS 12c database.  I use the Oracle ASM
filesystem on the target side.

I've never tried to mount to a Windows server before with my setup.  You
didn't mention if you had a SSD for ZIL, but you might want to try
disabling the ZIL and seeing if that helps your performance.

You can also monitor what the ZIL is doing with a great little program
written by Richard Elling.
http://www.richardelling.com/Home/scripts-and-programs-1/zilstat With this
you can monitor the ZIL writes - it should help to figure out if that is
your problem or not.

Good luck!

thanks,
liam



On Thu, Sep 4, 2014 at 1:29 AM, Mark <mark0x01 at gmail.com> wrote:

> Does anyone have experience with Comstar as a Fibre Channel Target ?
>
> I build one some years ago, which ran really well, but my latest effort is
> disappointing.
>
> Throughput is abysmal, only reaching about 20 Mbytes/sec depending on
> block size.
>
> Zpool is raidz with 30 x 4Tb SAS disk attached to a 6G SAS IT controller.
> Local disk throughput reaches over 400 Mbytes/sec.
>
>
> The Initiator is Windows 2012 with Qlogic 8G adapter, and Qlogic 4G at the
> OI end, with straight cable.
>
> It works, no errors I can find, but performance just sucks.
>
> In desperation, I'm about to try swapping the Qlogic for an Emulex HBA.
>
> Can anyone offer suggestions on identifying possible causes ?
>
> Mark.
>
>
>
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