In the older version of lustre, I can see a patch named "raid5-merge-ios-rhel5.patch" which is related to RAID performance improvement for RHEL5.

As per my understanding, it accumulates the bios in a single make_request function of RAID layer and sends them collectively by generic_make_request instead of sending them separately per stripe basis.
By this means, performance of RAID could be improved.

But this patch is not present in newer version of lustre and especially for RHEL6.

So, is it possible to port that patch for RHEL 6, provided RAID architecture is changed significantly and handling of stripe has been made asynchronous in RHEL 6 as compared to synchronous handling of stripe in RHEL 5?
And even if it can be ported for RHEL6, will it give advantage as it was giving in RHEL 5 with different RAID architecture?


Regards,
Pratik