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Product: IBM Spectrum Protect for Space Management
Actor: User needs improvement of TCP port usage
The product is bundled in our product IBM Spectrum Archive Enterprise Edition for space management of IBM Spectrum Scale.
Description: In multi-nodes cluster environment,
dsmrecalld on owner node distributes transparent recall requests to other nodes by default. Then distributer dsmrecalld daemon polls other nodes for completion of the recalls by every 100msec using ports provided by rpcbind of the system. It uses many well-known ports and makes all the well-known port range ( 512 - 1023 ) into TIME_WAIT state. It disturbs other service like rshd to obtain ports from rpcbind.
We need mitigation of this matter in distributed recall environment.
Idea priority | Medium |
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submission of this RFE was suggested by HSM development.
There is no firewall between the nodes.
also, there are no Spectrum Protect server/client ( a.k.a TSM).
HSM clients are running with IBM Spectrum Archive Enterprise Edition (LTFSEE) as a bundled component on multi-node cluster environment.
Development has already determined in CSP skill case specified on this RFE item that inter-node communication between dsmrecalld uses so many ports
to check completion of recalls that were requested to other cluster nodes. and it is by current design and it should be re-considered for improvement.
Are there any firewalls between the nodes?
Spectrum Protect uses meta data communications and data communications on different sessions if client side deduplication is being used.
And if there are too little traffic going over the meta data session, than a firewall might terminate the session.
Other solutions?
At spictera we have created a filesystem for IBM Spectrum Protect, making it possible to mount the IBM Spectrum Protect storage data as a mountpoint on your server.
The benefits of this is that there are no need for local stubfiles, which can be out of sync with the actual data. There is built in failover, and utilizes allmost all features available on a normal BA-client, such as filtering (inclexcl), encryptions, dedup, compression, ...
https://www-50.ibm.com/partnerworld/gsd/solutiondetails.do?solution=56435&lc=en&stateCd=P&tab=2
# mount -t spfs /archive
Or as a drive letter on Windows
Regards Tomas Dalebjörk