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mmbackup Command
Name
mmbackup – Backs up a GPFS file system to a backup server.
Synopsis
mmbackup Device -n ControlFile [-t {full | incremental}] [-s SortDir]
Or,
mmbackup Device -R [-s SortDir]
Description
Use the mmbackup command to backup a GPFS file system to a backup server. mmbackup takes a
temporary snapshot named .mmbuSnapshot of the specified file system, and backs up this snapshot to a
back end data store. Accordingly, the files backed up by the command will be stored in the directory
/Device/.snapshots/.mmbuSnapshot in the remote data store. This command may be issued from any
GPFS node in the cluster to which the file system being backed up belongs, and on which the file system
is mounted.
Parameters
Device The device name for the file system to be backed up. This must be the first parameter and
must be fully-qualified, such as /dev/fs0. The device name must be specified; there is no
default value.
-n ControlFile Specifies the file containing the backup control information. The file must be in the present
working directory or the path must be fully qualified. Each piece of control information
must be on a separate line and correctly qualified. Comment lines are allowed and must
begin with a # in column 1. Empty lines may not contain any blank characters. Valid lines
either contain a # in column 1 indicating a comment, an = indicating a value is being set,
or no characters at all.
This option may be specified only if the backup type is full or incremental. If the -R option
has been specified, this information is obtained from the control information specified on
the earlier full or incremental mmbackup command that completed with partial success.
The allowable qualifiers in the control file are:
serverName The name of the node specified as the backup server qualified with
serverName=. The backup server node may or may not be a GPFS node,
although performance may be improved if it is also a backup client node.
You may specify only one backup server.
clientName The backup clients, one per line, qualified with clientName=. The backup
client nodes must be a member of the GPFS cluster where the file system
is mounted. For improved performance it is suggested that multiple
backup client nodes be specified. The maximum number of backup clients
supported is 32.
numberOfProcessesPerClient
The number of processes per client qualified with
numberOfProcessesPerClient=. The number of processes per client may
be specified only once.
78 GPFS: Administration and Programming Reference