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34 Chapter 3
Functional and Operational Characteristics
Table 3.5 System Option Modes for ShadowImage - S/390
®
and ShadowImage
Mode Level Description and Usage
80 Optional ShadowImage Quick Restore function.
ON: 9900 does not perform the ShadowImage Quick Restore function.
OFF: 9900 performs the ShadowImage Quick Restore function.
87 Optional Quick Resync by CCI (RAID Manager).
ON: 9900 performs ShadowImage quick resync operation for Resync command from CCI.
OFF: 9900 does not perform ShadowImage quick resync operation for Resync command from CCI.
Microcode level: 01-13-18-00/07 and higher.
122 Optional ShadowImage Quick Split and Quick Resync functions.
ON: 9900 does not perform ShadowImage quick split and quick resync operations.
OFF: 9900 performs ShadowImage quick split and quick resync operations.
Table 3.6 System Option Modes for TrueCopy - S/390
®
Synchronous & Asynchronous (continues on the
next page)
Mode Level Description and Usage
20 Optional Enables TC390 – R-VOL read-only function (RCU only).
ON: R-VOL read only function is available.
OFF: R-VOL read only function is not available.
Microcode level: 01-10-00-00/10 and higher.
36 Optional TC390 Synchronous – Selects function of CRIT=Y(ALL) or CRIT=Y(PATHS).
ON: CRIT=Y(ALL) => equivalent to Fence Level = Data.
OFF: CRIT=Y(PATHS) => equivalent to Fence Level = Status.
Microcode level: 01-10-00-00/10 and higher.
38 Optional TC390 – Changes SSB reported against the WRITE I/O to the M-VOL in critical state.
ON: Intervention required.
OFF: Command rejected (PPRC specification).
Microcode level: 01-10-00-00/10 and higher.
49 Optional TC390 – Changes reporting of SSIDs in response to CQUERY command (which is limited to four SSIDs).
When 64 LDEVs per SSID are defined, mode 49 must be ON for TC390, GDPS, and P/DAS operations.
When 256 LDEVs per SSID are defined, mode 49 must be OFF.
ON: Report first SSID for all (256) devices in the logical CU.
OFF: Report SSID specified for each 64 or 256 devices.
Microcode level: 01-10-00-00/10 and higher.
64 Optional TC390 CGROUP – Defines scope of CGROUP command within the 9900. Must be OFF for GDPS.
ON: All TC390 volumes in this 9900 subsystem.
OFF: TC390 volumes behind the specified LCU pair (main and remote LCUs).
Microcode level: 01-10-00-00/10 and higher.