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Chapter 4 Functions of ReplicationControl
121
Description
ldn: Logical disk number
ld_name: Logical disk name
vaa: VAA (Volume Absolute Address)
type: OS type
special_file_name: Special file name
disk_array_name: Disk array name
path: Whether to use a special file
Usually this field is blank and nothing appears in this field, however,
when data replication or snapshot is performed, if an error is detected in
access to the special file, “B” appears.
About the state of Path (whether to use a special file)
Establishing multiple connections to the same logical disk enables a path (special file) to have
redundant configuration. In this case, for each command of data replication or snapshot, when
an error is detected in access to the path (special file) used for issuing an I/O, access is switched
automatically to another path (special file) registered in the volume list and I/O continuation to a
disk array is tried.
When an error is detected in access to a path (special file), “B” is displayed in the Path
information of the special file used at the time, which indicates an error occurs in the special file.
After a path error is recovered, when access to a volume by a blocked path is established
successfully, the Path information of the special file is cleared and the blocked state is released.
(iv) When the -ctl option is specified:
Information on a control volume as shown below is listed.
--- Control Volume List ---
Special File LDN Disk Array Name Path
special_file_name ldn disk_array_name path
Description
special_file_name: Special file name
ldn: Logical disk number
disk_array_name: Disk array name
path: Whether to use a special file
Usually this field is blank and nothing appears in this field, however,
when data replication or snapshot is performed, if an error is detected in
access to the special file, “B” appears.