[gpfsug-discuss] GPFS 3.5 to 4.1 Upgrade Question

[Aaron Knister]

Thanks!

I do have a question, though. Feature level 1340 I believe is equivalent 
to GPFS version 3.5.0.11. Feature level 1502 is GPFS 4.2 if I understand 
correctly. That suggests to me there are 3.5 and 4.2 nodes in the same 
cluster? Or at least 4.2 nodes in a cluster where the max feature level 
is 1340. I didn't think either of those are supported configurations? Am 
I missing something?

-Aaron

On 12/7/16 11:56 AM, Sander Kuusemets wrote:
> It might have been some kind of a bug only we got, but I thought I'd
> share, just in case.
>
> The email when they said they opened a ticket for this bug's fix was
> quite exactly a month ago, so I doubt they've fixed it, as they said it
> might take a while.
>
> I don't know if this is of any help, but a paragraph from the explanation:
>
>> The assert "msgLen >= (sizeof(Pad32) + 0)" is from routine
>> PIT_HelperGetWorkMH(). There are two RPC structures used in this routine
>> - PitHelperWorkReport
>> - PitInodeListPacket
>>
>> The problematic one is the 'PitInodeListPacket' subrpc which is a part
>> of an "interesting inode" code change. Looking at the dumps its
>> evident that node 'stage3' which sent the RPC is not capable of
>> supporting interesting inode (max feature level is 1340) and node
>> tank1 which is receiving it is trying to interpret the RPC beyond the
>> valid region (as its feature level 1502 supports PIT interesting
>> inodes). This is resulting in the assert you see. As a short term
>> measure bringing all the nodes to the same feature level should make
>> the problem go away. But since we support backward compatibility, we
>> are opening an APAR to create a code fix. It's unfortunately going to
>> be a tricky fix, which is going to take a significant amount of time.
>> Therefore I don't expect the team will be able to provide an efix
>> anytime soon. We recommend you bring all nodes in all clusters up the
>> latest level 4.2.0.4 and run the "mmchconfig release=latest" and
>> "mmchfs -V full"  commands that will ensure all daemon levels and fs
>> levels are at the necessary level that supports the 1502 RPC feature
>> level.
> Best regards,
>

-- 
Aaron Knister
NASA Center for Climate Simulation (Code 606.2)
Goddard Space Flight Center
(301) 286-2776