To use the XRC enhanced readers, issue the XADDPAIR command of another
volume in storage. Enable the support through the XADDPAIR of another
volume in the SSID, with XRCUTL as the secondary device by using the
same SCSN value.
If explicit XRCUTL devices are used, enable the XRC enhanced multiple
reader by using the following methods:
- Issue an XADDPAIR command to the existing XRCUTL device for one
of the storage control sessions on the SSID. (This storage control
session becomes the primary enhanced session.)
- If there is only one storage control session name, issue an XADDPAIR
command to add an additional XRCUTL volume.
- If there are multiple storage control session names, issue an
XADDPAIR command to use an existing XRCUTL with a different storage
control session name. (This different storage control session name
is the name of the first session that has been converted to the enhanced
mode.)
If there is only one SCSN, refer to the following scenarios to
enable the XRC enhanced readers:
The following scenarios use AA as existing SCSN value.
If the session is suspended, there is no ANTASnnn address space,
and there is only one SCSN in an LSS, use the following steps:
- Issue an XSTART command.
- Issue an XADDPAIR command for the XRCUTL AA. XRCUTL AA is converted
to an enhanced primary session.
- Issue an XADDPAIR command for the new XRCUTL volume
with the existing SCSESSION id. Repeat this step for all new XRCUTL
volumes.
- Issue an XADDPAIR SUSPENDED command to resynchronize the remaining
volumes.
If the XRC session is active, and there is only one SCSN, use the
following step:
- Issue an XADDPAIR command for the new XRCUTL volume with the existing
SCSESSION id. Repeat this step for all new XRCUTL volumes.
If there are multiple SCSNs, use the following scenarios to enable
the XRC enhanced readers:
The following scenarios use AA and BB as the existing SCSN values.
If the session is suspended, there is no ANTASnnn in the address
space, and there are multiple SCSNs in an LSS, convert a set of storage
control names to an enhanced multiple reader. To convert a set of
storage control names, use the following steps:
- Issue an XSTART command.
- Issue an XADDPAIR command for the XRCUTL BB with the SCSESSION
id, AA. Repeat the step for all the existing SCSN utility volumes.
- Issue an XADDPAIR SUSPENDED command to resynchronize
the remaining volumes.
If the XRC session is active, and there are multiple SCSNs, use
the following steps:
- Issue an XADDPAIR command for the XRCUTL AA. XRCUTL AA is converted
to an enhanced primary session.
- Issue an XADDPAIR command for the XRCUTL volume, BB, with the
SCSESSION id, AA. Repeat the step for all the existing SCSN utility
volumes.