Hitachi Extended Remote Copy for Mainframe user guide (HITA738-96004, June 2008)

Behavior of the Storage SystemOption Settings in
XRC for
Mainframe
If DonotBlock is Not Specified by
SDM (that is, If Block is Specified
by SDM)
If DonotBlock is Specified by SDMSettingsOptions
Level-2 suspension occurs when the
amount of used sidefile capacity
exceeds the level-2 threshold.
If Donot Block (Volume Level) is enabled, level-2
suspension does not occur when the amount of
used sidefile capacity exceeds the level-2
threshold. Also, the subsystem does not report
SCP-SCI to the host.
If Donot Block (Volume Level) is disabled, level-2
suspension occurs when the amount of used
sidefile capacity exceeds the level-2 threshold.
Enable
Level 2
Suspend
When the amount of used sidefile
capacity exceeds the level-2
threshold, level-2 suspension does
not occur. The subsystem reports
SCP-SCI to the host.
If Donot Block (Volume Level) is enabled, level-2
suspension does not occur when the amount of
used sidefile capacity exceeds the level-2
threshold. Also, the subsystem does not report
SCP-SCI to the host.
If Donot Block (Volume Level) is disabled, level-2
suspension does not occur when the amount of
used sidefile capacity exceeds the level-2
threshold. The subsystem reports SCP-SCI to the
host.
Disable
CAUTION:
To use XRC for Mainframe and more than one CLPR (cache logical partition), it is recommended that you
use SC sessions in the same CLPR. XRC for Mainframe options can be set to each CLPR. If an SC session
extends over more than one CLPR, the subsystem operates depending on the XRC for Mainframe option
setting for each CLPR. For example, if more than one session exists in one CLPR and then the amount of
used sidefile capacity in the CLPR reaches level-2 (if the Level 2 Suspend option of XRC for Mainframe is
enabled) or level-3 , the session that occupies the largest capacity in the sidefile in the cache will be
suspended.
CAUTION:
When using a drive in which its DKU emulation type is 3390-M as a P-VOL or an S-VOL, patch the SDM,
which is host software at the secondary site, with the following PTF (Program Temporary Fixes).
[PTF] UA18053: SUPPORT XRC VOLUME SIZE UP TO 65520 CYL
Drives in which its DKU emulation type is 3390-M cannot be used as a P-VOL or an S-VOL in XRC for
Mainframe operations if the PTF is not patched to the SDM.
Requirements and Restrictions24