GPFS: Administration and Programming Reference - IRA Home

v The primary server is configured and the volume group is varied online there.
v The backup server is configured and the volume group is imported there, but varied off.
v The DescFile file is rewritten to contain the created virtual shared disk names in place of any disk
descriptors containing physical disk or vpath names. Primary and backup servers are omitted from the
rewritten disk descriptor and all other fields, if specified, are copied without modification. The rewritten
disk descriptor file can then be used as input to the mmcrnsd command.
Error recovery
Each step of the mmcrvsd process is enumerated during command execution. For example at step 0, the
mmcrvsd command prints:
Step 0: Setting up environment
As each step is started, its corresponding number is recorded in the DescFile file as a comment at the
end. This comment serves as restart information to subsequent invocations of the mmcrvsd command.
For example at step one, the recorded comment would be:
#MMCRVSD_STEP=0
Upon failure, appropriate error messages from the failing system component are displayed along with
mmcrvsd error messages.
After correcting the failing condition and restarting the mmcrvsd command with the same descriptor file,
the command prompts you to restart at the last failing step. For example, if a prior invocation of mmcrvsd
failed at step one, the prompt would be:
A prior invocation of this command has recorded a partial
completion in the file (/tmp/DescFile).
Should we restart at prior failing step(1)?[y]/n=>
The default response is y; yes restart at the prior failing step.
Parameters
-F DescFile
The file containing the list of disk descriptors, one per line, in the form:
DiskName:PrimaryServer:BackupServer:DiskUsage:FailureGroup:DesiredName:StoragePool
mmcrvsd Command
DiskName
The device name of the disk you want to use to create a virtual shared disk. This can be
either an hdisk name or a vpath name for an SDD device. GPFS performance and
recovery processes function best with one disk per virtual shared disk. If you want to
create virtual shared disks with more than one disk, refer to the correct manual for your
environment at: publib.boulder.ibm.com/clresctr/windows/public/rsctbooks.html
PrimaryServer
The name of the virtual shared disk server node. This can be in any recognizable form.
BackupServer
The backup server name. This can be specified in any recognizable form or allowed to
default to none.
Disk Usage
Specify a disk usage or accept the default (see General Parallel File System: Concepts,
Planning, and Installation Guide and search on recoverability considerations). This field is
ignored by the mmcrvsd command and is passed unchanged to the output descriptor file
produced by the mmcrvsd command.
dataAndMetadata
Indicates that the disk contains both data and metadata. This is the default.
Chapter 8. GPFS commands 135