HP StorageWorks XP Remote Web Console Software - Manual (Page 12)

Compatible XRC and Concurrent Copy (CC) also use cache sidefiles. Storage systems performing
TrueCopy for Mainframe Asynchronous, Compatible XRC, and/or CC must have sufficient cache
installed to handle the increased sidefile usage. Insufficient cache can degrade storage system
I/O performance and cause command retry requests and state-change-pending (SCP) messages.
See
“XP Disk Array Modes for TrueCopy for Mainframe” (page 12) for further information on cache
usage and sidefile thresholds.
Table 2 XP Disk Array Modes for TrueCopy for Mainframe
Description Mode
Enables TrueCopy for Mainframe − R-VOL read-only function (RCU only). 20
ON for MCU's and RCU's which connect to CNT channel extenders. 21
TrueCopy for Mainframe 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.
36
TrueCopy for Mainframe – Allows you to change the volume level that is suspended when the FREEZE
command is issued from the host. The target will change from the single volume in the CU where the
FREEZE command is issued to all the volumes in the entire DKC if this mode is ON. Mode 64 ON: All
the volumes in the entire DKC will be suspended. Mode 64 OFF: Only the volume in the CU for which
the FREEZE command is issued will be suspended. 64
Graduated delay process for sidefile control:
Mode 93 OFF (default) = strong delay type Mode 93 ON = soft delay type Amount of sidefileStrong
delay typeSoft delay type
threshold − [15-20%] (HWM)100 ms x 1 time20 ms x 1 time threshold − [10-15%]200 ms x 1 time40
ms x 1 time
threshold − [5-10%]300 ms x 1 time60 ms x 1 time threshold − [0-5%]400 ms x 1 time80 ms x 1 time
threshold or higher500 ms x permanent100 ms x permanent
93
TrueCopy for Mainframe CGROUP − Selects storage system default for CGROUP FREEZE option. Applies
to 3990 emulation only.
Mode 104 is invalid if the controller emulation is 2105 or 2107. For 2105 or 2107, use the CGROUP
option of CESTPATH.
Mode 104 ON: FREEZE enabled.
Mode 104 OFF (default): FREEZE disabled.
104
TrueCopy for Mainframe – Allows dynamic port mode setting (Initiator/RCU target for Fibre Channel)
through PPRC CESTPATH and CDELPATH commands.
Mode 114 ON: Initiator ports will automatically change to RCU target ports. or vice versa.
Mode 114 OFF (default): Initiator ports will not automatically change to RCU target ports, nor vice versa.
For Fibre Channel interface, do not use the CESTPATH and CDELPATH commands at the same time as
the SCSI path definition function of LUN Manager. The Fibre Channel interface ports need to be configured
as initiator ports or RCU target ports before the CESTPATH and CDELPATH commands are issued.
Even if you set ON for system option mode 114, initiator ports will not automatically change to RCU
target ports, nor vice versa, when these ports are in initiator/external mix mode.
CAUTION: Before issuing the CESTPATH command, you must make sure that the relevant paths are
offline from the host(s) (for example, configure the Chipid offline, or deactivate the LPAR, or block the
port in the ESCD). If any active logical paths still exist, the add path operation will fail because the port
mode cannot be changed.
114
TrueCopy for Mainframe Asynchronous − Allows you to select whether to generate SIM when the sidefile
of TrueCopy for Mainframe Asynchronous, Compatible XRC, and CC reaches high-water mark (HWM
= sidefile threshold - 20%. See mode 93). This mode takes effect on the volume to which the inflow control
is set.
Mode 118 ON: Generate SIM.
Mode 118 OFF (default): No SIM generated.
The reported SIM when this mode is ON is reported per CLPR.
118
12 About TrueCopy for Mainframe Operations