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vmmaxparallel, vmlimitperdatastore, vmlimitperhost, vmmaxbackupsessions


Good Afternoon, I hope everybody is safe.

Specrum Protect 8.1.8 on 1 Windows Server 2012R2.
Spectrum Portect for VE on another Windows Server 2012R2.
vCenter with 8 nodes ESXi, version 5.5

500 Virtual Machine
60 DataStores
Total Storage is about 150 TB

We do LANFREE to a IBM TS3310 Library with 4 Drives LTO7.
We can also Backup via LAN with a dedicated 10Gb connection.

Do you have suggestions regarding these parameters?
vmmaxparallel, vmlimitperdatastore, vmlimitperhost and vmmaxbackupsessions

Thank you very much.

Kind Regards.


Last weekend I did my test with the following parameters:

vmmaxparallel 4
vmlimitperdatastore 2
vmlimitperhost 2
vmmaxbackupsessions 4

Here is the result.

04/19/2020 10:00:19 Aggregate statistics for Backup VM command.
04/19/2020 10:00:19 Total number of objects inspected: 407
04/19/2020 10:00:19 Total number of objects backed up: 407
04/19/2020 10:00:19 Total number of bytes inspected: 70.90 TB
04/19/2020 10:00:19 Total number of bytes transferred: 51.08 TB
04/19/2020 10:00:19 Data transfer time: 199,961.82 sec
04/19/2020 10:00:19 Network data transfer rate: 274,293.98 KB/sec
04/19/2020 10:00:19 Aggregate data transfer rate: 597,672.20 KB/sec
04/19/2020 10:00:19 Objects compressed by: 0%
04/19/2020 10:00:19 Total data reduction ratio: 27.95%
04/19/2020 10:00:19 Elapsed processing time: 25:29:29
04/19/2020 10:00:19 Backup VM command complete
04/19/2020 10:00:19 Total number of virtual machines backed up successfully: 407

Kind Regards.


ADSM.ORG Senior Member
So all those settings control how hard you hit your vm infrastructure for backups. If you have fast servers with fast storage, and plenty of free storage on your datastores (default setting is 15% free I think) feel free to up those numbers. Eventually you'll get a point of no return where the datamovers CPU can't keep up, or your TSM server IO can't keep up. Incrementally step them up and see where it starts to fall apart and then back them off.

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The Spectrum Protect TLA (Three-Letter Acronym): ISP or something else?

  • Every product needs a TLA, Let's call it ISP (IBM Spectrum Protect).

    Votes: 18 18.8%
  • Keep using TSM for Spectrum Protect.

    Votes: 58 60.4%
  • Let's be formal and just say Spectrum Protect

    Votes: 12 12.5%
  • Other (please comement)

    Votes: 8 8.3%

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