[OpenIndiana-discuss] Comstar Fibre Channel Target

[Liam Slusser]

Mark -

No I didn't change any of the HBA bios or QLT parameters.  Are you going
into a fibre channel switch?

thanks,
liam



On Fri, Sep 5, 2014 at 1:06 AM, Mark <mark0x01 at gmail.com> wrote:

>
> 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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>
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