Vmmaxbackupsessions
The vmmaxbackupsessions option specifies the maximum number IBM Spectrum Protectâ„¢ server sessions that move virtual machine (VM) data to the server that can be included in an optimized backup operation.
An optimized backup operation is one in which parallel backup capability is enabled at the VM, virtual disk, or subdisk level.
The vmmaxbackupsessions option works with the vmmaxparallel, vmlimitperdatastore, and vmlimitperhost options to optimize backup operations and to help control the amount of resources that the backup can create on a host in the vSphere infrastructure. Adjust the values of these options to find the values that provide optimal performance for the backups that are in your environment.
Supported clients
This feature is available only if the client operates as a data mover for IBM Spectrum Protect for Virtual Environments: Data Protection for VMware.
This option can be used with supported x86_64 Linux clients.
This option can be used with supported Windows clients.
Options file
This option is valid in the client system options file (dsm.sys), in the client options file (dsm.opt), or on the command line for Backup VM. It can also be included on the server in a client options set. It cannot be set in the Preferences Editor.
This option is valid in the client options file (dsm.opt) or on the command line for Backup VM. It can also be included on the server in a client options set. It cannot be set in the Preferences Editor.
Syntax
Parameters
- integer
-
Specifies the maximum number of IBM Spectrum Protect server sessions that can be created during the backup operation.
Review the following information for using the vmmaxbackupsessions option along with the vmmaxparallel option or the maxnummp server parameter:- vmmaxparallel
- The vmmaxparallel option specifies the maximum number of virtual machines that can be backed up to the IBM Spectrum Protect server at any one time. The value of the vmmaxbackupsessions option must be equal to or greater than the value of the vmmaxparallel option.
- maxnummp
- The maxnummp server parameter specifies the maximum number of mount points a node is allowed to use on the server when the copy destination of the storage pool is FILE or TAPE. The maxnummp parameter must be equal to or greater than the vmmaxparallel and vmmaxbackupsessions option settings. When multiple instances of the client are backing up files, or when a single client performs parallel backups, more mount points might be needed.
The maximum that you can specify is 100 sessions. The default is the value that is set for the vmmaxparallel option.
Examples
- Options file
- VMMAXBACKUPS 10
- Command line:
-
dsmc backup vm -VMMAXBACKUPS=10