IBM Support

How many sessions would be established while doing backup multiple VMs in parallel?

Question & Answer


Question

When doing backup multiple virtual machines using Tivoli Storage Manager BA Client with VMMAXParallel option, how may sessions can be established with the server in total?

Answer

There are:
1 session for main thread
2 sessions per vm operation - one for consumer, one for API (used for actual vm processing)
1 more session for consumer that starts, connects to the server, checks that there's nothing to do and closes the session (it appears briefly at the start of the backup)

And the equation is
Total number of sessions = (2 + 2 * VMMAXParallel) for each simultaneous BA clients.

So for example, if you plans to do "backup vm" for 13 virtual machines in parallel with specifying VMMAXParallel 13 or larger value, number of sessions will be established 28 in total. It is necessary to set MAXSESSIONS server option 28 or larger value. Otherwise backup of one virtual machine could fail with "ANS1351E Session rejected: All server sessions are currently in use" because the default value of MAXSESSIONS is 25.

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Document Information

More support for:
Tivoli Storage Manager

Software version:
6.4, 7.1

Operating system(s):
Linux, Windows

Document number:
247859

Modified date:
17 June 2018

UID

swg21681880