Hitachi ShadowImage for z/OS user guide (December 2005)

ShadowImage for z/OS user guide 123
CAUTION: When the relationships are withdrawn by the FCWITHDR command executed with DDSW
parameter set to NO or without setting the DDSW parameter, the data integrity of the T-VOL cannot be
guaranteed.
CAUTION: If you use the FCWITHDR command only one time when deleting numerous relationships, a
timeout might occur with the host. Use the FCWITHDR command more than one time when deleting
numerous relationships. Also, after you execute the FCWITHDR command one time, wait for a while before
executing the FCWITHDR command again. For example, if you execute the FCWITHDR command one
time when deleting 700 relationships, wait for approximately 5 seconds before executing the command a
second time.
Displaying Information on FlashCopy Mirror Version 2 Pairs: FCQUERY
The FCQUERY command can be used to display information including the attributes set to the devices
specified by DEVN, and the number of FlashCopy Mirror Version 2 relationships established with the
specified devices.
The figure below shows an example of the FCQUERY command. This example requests the information on
the device numbered 4202 to be displayed.
Figure 78 Example of FCQUERY Command Description
The figure below shows the information displayed as a result of executing the command described above.
Definition of each displayed information is explained in Table 58.
Figure 79 Example of FCQUERY Command Execution Result
FCQUERY DVEN(X'4202')
ANTF0090IF CQUERY Formatted
DEVN SSID LSS CCA CU SERIAL ACT MAX XC PC CC RV SEQNUM
4202 0102 02 02 2105 000000045029 1 1000 N N N N 00000000
Table 58 Information Displayed by FCQUERY Command
Displayed
item
Displayed
content
Definition
DEVN Device number recognized by the host
SSID Subsystem number
LSS CU number
CCA Device number
CU DKC emulation type
SERIAL Serial number
ACT Number of active FlashCopy Mirror Version 2 pairs. See Figure 80.
MAX Maximum number of pairs that can be created with the device specified by DEVN.
XC S Volume specified by DEVN is currently used as an S-VOL of the XRC pair, an At-Time
Split volume for SIz, or an asynchronous M-VOL of the TCz pair. Note that if the volume
is an asynchronous M-VOL of the TCz pair, the CT type is SYSTEM or NONE, and the
pair status is other than Suspend.
N Volume specified by DEVN is not in the status described above, or the volume is not
used.