Hitachi ShadowImage for z/OS user guide (HIT9503-96004, June 2006)

ShadowImage for z/OS user guide 135
Figure 91 Calculation Example of the Number of the Pairs Displayed in “ACT”
ACT shows the total number of the active FlashCopy Mirror Version 2 pairs in each extent. Therefore, in the
example in Figure 91, the total number of the active FlashCopy Mirror Version 2 pairs in the VOL#0 and
VOL#1 is both two, and “2” is displayed as the content of ACT.
Cautions on Switching Off the Power Supply When Using Compatible Mirroring for
IBM FlashCopy Version 2
The following explains what happens if you power off the disk array during FlashCopy Mirror Version 2
operations and later power on the disk array. What happens depends on the status of the shared memory
when powering on the disk array:
CCA Device number
CU DKC emulation type
SERIAL Serial number
ACT Number of active FlashCopy Mirror Version 2 pairs. See Figure 91.
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.
PC P Volume specified by DEVN is currently used as the S-VOL (M-VOL) of the SIz or TCz
pair.
S Volume specified by DEVN is currently used as the T-VOL (R-VOL) of the SIz or TCz pair.
N Volume specified by DEVN is currently not used for SIz or TCz.
CC S Volume specified by DEVN is currently used as the S-VOL of the Concurrent Copy pair.
N Volume specified by DEVN is currently used as the T-VOL of the Concurrent Copy pair,
or not used for Concurrent Copy.
RV Displays whether the volume specified by DEVN is Revertible or not. However, since FlashCopy
Version 2 does not support this function, “N” will be always displayed for this item. For details about
Revertible, please refer to the IBM manual.
SEQNUM Displays the Sequence Number. However, since FlashCopy Version 2 does not support this function,
“00000000” will be always displayed for this item. For details about Sequence Number, please
refer to the IBM manual.
Table 60 Information Displayed by FCQUERY Command (continued)
Displayed
item
Displayed
content
Definition