Functions That Acquire Volume Information; Local Scan; Remote Scan - HP XP P9500 Software User's Manual

Table 22 Differences in functionality between the NORMAL ATTIME suspend function and the CAJ
ATTIME suspend function
No. Points of comparison
1 Target copy groups
2 Execution environment
3 Times when suspension is
executed
4 Timeout time
5 Acquisition of the status
6 The number of BC Z
generations

Functions that Acquire Volume Information

Before you can configure Business Continuity Manager, you must acquire the volume information
from the storage systems on the local and remote sites. Although you can do this by locating and
entering the hardware configuration definition information manually, it is easier to perform a scan
on the storage systems on each of the sites for this information when defining the copy group.

Local Scan

The function that acquires disk configuration information on the following volumes is called a local
scan: volumes recognized by the operating system (Gen'ed volumes) among all of the volumes on
a storage system that is directly connected to a host. To perform a local scan, use the YKSCAN
command.

Remote Scan

To acquire disk configuration information about a remote storage system, perform a function called
a remote scan. A remote scan can be used to define copy groups, even for configurations with
remote storage systems, such as a 3DC operation.
Because the remote scan uses the Remote DKC Control Function, it is necessary to set a command
device and a route list. Also, the disk configuration information acquired by the remote scan does
not have device numbers (DEVN) that are host attributes, because the information is from a storage
90 Understanding Business Continuity Manager functions
NORMAL ATTIME suspend
function
Cnt Ac-A copy groups
BC Z copy groups with C/T
group ID specified
Local
The time is determined by the
timestamp of an I/O to the
P-VOL.
The user cannot specify this
item.
The status of the copy group to
be suspended can be
acquired.
A maximum of three S-VOLs
can be defined for a single BC
Z P-VOL, and ATTIME
suspension can be reserved for
each S-VOL.
CAJ ATTIME suspend function
Linkage of Cnt Ac-J Z copy
groups and BC Z copy groups
with C/T group ID specified
Remote
Local
The time is determined by the
timestamp of the journal to be
reflected to the Cnt Ac-J Z
S-VOL.
The user can specify this item.
The default time is determined
by the storage system.
The status of the BC Z copy
group to be suspended can
be acquired.
The status of the Cnt Ac-J Z
copy group can be checked
when the BC Z copy group
is suspended. If an error
has occurred, a message is
output.
A maximum of three BC Z copy
groups with a C/T group ID
specified can be linked to a
single Cnt Ac-J Z journal group.