[OpenIndiana-discuss] Comstar Fibre Channel Target

[Mark]

Thanks Liam,

no ssd's.
Did you change any hba bios or qlt parameters ?


Unfortuntely the only Emulex adapter I have is unsupported - an LPe1150.

I tried a different "brand" of 4G QLogic adapter.
After adding an alias for it to even be seen, the performance was the 
same. Around 200Mb/sec read and under 30 for write.

I do have access to an 8Gb one I could try next.

The luns will eventually be for Commvault storage, with a 64k block 
size. Trying different zfs block sizes hasn't made a significant 
difference to the Windows throughput.

Mark.


On 4/09/2014 9:31 p.m., Liam Slusser wrote:
> 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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