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Status Not under consideration
Created by Guest
Created on Aug 25, 2014

HSM Slow Recall in LAN Free environment

got the following feedback from development:
as stated by GPFS development, the dm_request_right takes a lot of of
execution time due to required context switches.
More calls of dm_request_right causes the greater slowdown. So,in
order to improve the lan-free recall performance ,
we should reduce the number of calls to the dm_request_right.

We can do it in two ways:
1. Increase the buffer size used for the writing from 32k to
256k(256k buffer is already used in normal recall).
2. Reduce the number of calls to the dm_request_right in the
client code.

But the both cases will require a lot of changes in the client and
server code. As well it will
require a lot of tests(partial/streaming/normal recall).

For now customer can only open a Request For Enhancement (RFE) to
address the issue.

The RFE website can be found here:

Please open a RFE and provide me the RFE number.

Idea priority High
  • Guest
    Jun 12, 2015

    Due to processing by IBM, this request was reassigned to have the following updated attributes:
    Brand - Servers and Systems Software
    Product family - Storage
    Product - Tivoli Storage Manager (TSM) Family

    For recording keeping, the previous attributes were:
    Brand - Tivoli
    Product family - Storage
    Product - Tivoli Storage Manager (TSM) Family

  • Guest
    Sep 24, 2014

    Thank you for submitting this request. We will continue to assess demand before solidifying on plans for delivering this in a future release though this is a consideration. This should not be taken as a statement of commitment as plans and strategy can shift.