HP StorageWorks XP Remote Web Console Software - Manual (Page 124)

124 ShadowImage for the XP128/XP1024/XP10000/XP12000
Figure 80 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 80 , 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:
• If data on the shared memory is not volatilized and not lost:
The status before powering off will be maintained. As for the relationships in COPY mode, background
copying will automatically restart when you power on the disk array.
• If data on the shared memory is volatilized and lost:
If relationships exist before powering off the disk array, the T-VOLs will become blocked and
inaccessible from hosts when you power on the disk array. Thus, the host does not access the
inconsistent data in the T-VOLs. To restore the T-VOLs to normal status, force restoration of LDEVs.
CAUTION: If data on the shared memory is volatilized and lost after the power turns on, problems
may occur during operations. To avoid possible problems, withdraw as much relationships as
possible before powering off the disk array.
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 58 Information Displayed by FCQUERY Command (continued)
Displayed
item
Displayed
content
Definition