vmmaxparallel client option
The vmmaxparallel option specifies the maximum number of virtual machines that can be backed up to an IBM Storage Protect server at one time per client process.
- Preferred setting
- The preferred value for the vmmaxparallel option depends on the following
factors:
- Resource availability on the IBM Storage Protect server and client
- Network bandwidth between the server and the client
- The load tolerance on the participating VMware infrastructure
To determine the preferred setting for this option, experiment with parallel backups of the virtual machines. In that way, you can select a setting that is appropriate for the backup window and the hardware and system configuration in the environment.
The default value is 1, which might be too restrictive. The maximum value is 50, which might be ineffective.
In general, set this option to the highest value that still maintains a tolerable processor load on the vSphere hosts and a tolerable I/O load on the data stores for a virtual machine backup workload.
- Effects on performance
- Increasing this value can result in more parallelism in terms of backup processing and can improve aggregate throughput to the IBM Storage Protect server from a backup-archive client.
- Potential trade-offs for this setting
- Setting a value too low might limit the potential of a backup environment by restricting the
aggregate throughput to the IBM
Storage Protect server.
However, a low value might be necessary to throttle the amount of data that is sent from the client
to the IBM
Storage Protect server, or to reduce the processor
or I/O load on the vSphere hosts and data stores.
Setting a value too high might result in oversaturating the link between the client and the IBM Storage Protect server, or elevating the processor load on certain vSphere hosts. Beyond a certain value, you might not experience improvements in aggregate throughput performance, depending on the network bandwidth and proxy or vSphere host processor resources that are available.