HP StorageWorks XP Remote Web Console Software - Manual (Page 18)

18 Hitachi TrueCopy z/OS for HP XP12000/XP10000 and SVS 200 storage systems
NOTE: This mode information was current at the time of publication of this document, but it may change.
Contact your HP account support representative for the latest XP12000/XP10000 SVP system option mode
information.
XP12000/XP10000 performing TC390A operations (main and remote) use sidefiles in cache for storing
the TC390A recordsets. HXRC also uses cache sidefiles. Disk arrays performing TC390A and/or HXRC
must have sufficient cache installed to handle the increased sidefile usage. Insufficient cache can degrade
disk array I/O performance and cause command retry requests and state-change-pending (SCP)
messages. For more information on cache usage and sidefile thresholds, see ” Inflow control of recordsets ”
on page 31.
Table 3 XP12000/XP10000 modes for TrueCopy for z/OS
Mode Description
20 Enables TC390 – R-VOL read-only function (RCU only).
21 Required ON for MCUs and RCUs that connect to channel extenders.
36 TC390 Synchronous – Selects function of CRIT=Y(ALL) or CRIT=Y(PATHS).
Mode 36 ON: CRIT=Y(ALL) => equivalent to Fence Level = Data.
Mode 36 OFF: CRIT=Y(PATHS) => equivalent to Fence Level = Status.
38 TC390 – Changes SSB reported against the WRITE I/O to the M-VOL in critical state.
Mode 38 ON: Intervention required.
Mode 38 OFF: Command rejected (PPRC specification).
45 HXRC – Sleep Wait suppressing option (see modes 61, 85, 86, 97; see ” HXRC device blocking and
load balancing ” on page 216). When Mode 45 is ON and Mode 61 is ON, WRITE I/Os for LDEVs
are blocked by the threshold specified by SDM.
Mode 45 OFF: Sidefile threshold activates Sleep Wait timer at the sleep wait threshold.
Mode 45 ON: Sidefile threshold does not activate Sleep Wait timer at the sleep wait threshold.
61 HXRC – Enables the DONOTBLOCK option of the XADDPAIR command (see mode 45; see ” HXRC
device blocking and load balancing ” on page 216).
Must be OFF if the operating system does not support the DONOTBLOCK option.
Mode 61 OFF: DONOTBLOCK option ignored.
Mode 61 ON: DONOTBLOCK option activated.
64 TC390 CGROUP – Defines scope of CGROUP command within the XP12000/XP10000. Must be OFF
for GDPS.
Mode 64 OFF: TC390 volumes behind the specified LCU pair (main and remote LCUs).
Mode 64 ON: All TC390 volumes in this XP12000/XP10000.
85, 86 HXRC – Variable sidefile threshold (see modes 45, 97, 98; see ” HXRC device blocking and load
balancing ” on page 216).
Mode 85 ON and Mode 86 OFF: Thresholds for Sleep wait/SCP/Puncture = 30/40/50%
Modes 85 and 86 OFF: Thresholds for Sleep wait/SCP/Puncture = 40/50/60%
Mode 85 OFF and Mode 86 ON: Thresholds for Sleep wait/SCP/Puncture = 50/60/70%
Modes 85 and 86 ON: Thresholds for Sleep wait/SCP/Puncture = 60/70/80%