The vmmaxparallel option is used to
configure optimized backups of several virtual machines by using a single instance of the
backup-archive client. This option specifies the maximum number of virtual machines that can be
backed up to the IBM Spectrum Protect server at any one time.
An optimized backup operation is one in which parallel backup capability is enabled at the VM,
virtual disk, or subdisk level.
The vmmaxparallel option works with the vmmaxbackupsessions,
vmlimitperhost, and vmlimitperdatastore 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.
This feature
is available only if the client operates as a data mover for IBM
Spectrum Protect for Virtual Environments.
Supported clients
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) or on the command line for
the Backup VM command. 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 the Backup VM command. 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 virtual machines that can be backed up at any one
time during an optimized backup operation.
The default is 4. The maximum is 50.
Tip: When you use client-side data deduplication, a data deduplication session is
started for each VM. This data deduplication session is not counted as one of the
vmmaxparallel sessions.
Review the following information for using the vmmaxparallel
option in conjunction with the vmmaxbackupsessions option or the
maxnummp server parameter:
vmmaxbackupsessions
For Data Protection for VMware, the
vmmaxbackupsessions specifies the maximum number of sessions that move virtual
machine data to the server that can be included in an optimized backup operation. 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
backup operations, more mount points might be required.
If the values for vmmaxparallel or vmmaxbackupsessions exceed
the value for maxnummp, ANS0266I and other messages are displayed.
Depending on the message, the client reduces the value of the vmmaxparallel option
to match the number that is specified by maxnummp parameter or prohibits additional
sessions from being opened for the specified VM. In either situation, the backup operation
continues.
If additional ANS0266I errors are detected, the client reduces the
vmmaxparallel value by 1 and attempts to continue the backup. If
vmmaxparallel is decremented to 1 and the client receives more
ANS0266I errors, the client ends the backup and issues the following error:
ANS5228EA backup VM operation failed because VMMAXPARALLEL was reduced to 1 and the client still
cannot obtain a server mount point.
Contact your server administrator if you want the value that is currently set for
maxnummp increased so that a node can support additional parallel backup
sessions.
This feature
is available only if the client operates as a data mover for IBM
Spectrum Protect for Virtual Environments.