[OpenIndiana-discuss] Comstar Fibre Channel Target

[Mark]

I've added a switch, but that made things worse.
I now see frequent link loss under any load similar to issues discussed 
here about a year ago.


I'm going to flag fibre targets as a dead end, and explore smb or maybe 
iscsi on 10G ethernet instead.

Thanks for the input.

Mark.


On 6/09/2014 5:55 a.m., Liam Slusser wrote:
> 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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