IBM Z9, Planning Manual

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The reserved expanded storage element will remain online if it was already
online from the prior IPL.
Note: When z/OS is IPLed immediately after the LP is activated, both the
reserved central storage element and the reserved expanded storage
element are offline.
v
Whenever z/OS is re-IPLed in an LP that has a reserved central storage
element, a load clear or system reset clear followed by load normal should be
performed to force the reserved central storage element offline.
v When a standalone dump is to be performed on an LP, perform a load normal
(not a load clear) on that LP to keep the reserved storage element online and
preserve the storage contents.
CPCs with the Sysplex Failure Manager (SFM)
The Sysplex Failure Manager (SFM) allows you to reset and reconfigure one or
more logical LPs and their related storage. SFM allows workload redistribution from
the failed primary system to the backup system without operator intervention. For a
detailed description of how SFM works, see the z/OS Setting Up a Sysplex
publication.
To allow an LP to initiate these functions, use the Customize/Delete Activation
Profiles task to open a reset profile to authorize an LP to issue instructions to other
LPs. The Cross partition authority check box is located on the Security page for the
LP.
The following functions exist for SFM:
v
Cross Partition System Reset
This function causes a specified LP to be reset. The reset is accomplished via
the RESETTIME(nnn) keyword in the SYSTEM statement of the z/OS SFM
policy.
v
Cross Partition Deactivation
This function causes a specified LP to be deactivated. The deactivation is
accomplished via the DEACTTIME(nnn) keyword in the SYSTEM statement of
the SFM policy, and also, the RECONFIG statement in the SFM policy with a
specific TARGETSYS(sysname) specified.
v Cross Partition Nonspecific Deactivation
This function causes all logical partitions which are currently using any portion of
the reconfigurable central or expanded storage of the issuing partition to be
deactivated. The issuing partition is not deactivated. The nonspecific deactivation
is accomplished via the RECONFIG statement in the SFM policy with a
non-specific TARGETSYS(ALL) issued.
The Automatic Reconfiguration Facility (ARF) function is a hardware/LPAR function
that is part of the cross-partition authority control setting. ARF functions are used by
SFM policy functions within z/OS, when RESETTIME, DEACTTIME, or the
RECONFIG statement is coded in the SFM policy.
TARGETSYS(ALL) Examples
Specifying an Origin: Assume that the backup partition has specified an origin,
minimal initial storage, and a large amount of reserved storage. Since the backup
system does not own its complete addressable range, two other partitions, are
defined in the reserved storage of the backup partition. See Figure 3-14 on page
3-27
3-26
PR/SM Planning Guide