HP StorageWorks XP Remote Web Console Software - Manual (Page 17)

ShadowImage for z/OS user guide 17
The maximum number of pairs that can be created is the largest number that meets the equation,
, where:
stands for the total of the number of differential tables per pair, and
stands for the number of differential tables in the disk array.
= 2,048 when the number of CUs is equal to or less than 4
= 4,096 when the number of CUs is equal to or more than 5
For example, if you create 10 pairs of 3390-3 volumes and 20 pairs of 3390-L (32,760 CYL) volumes,
the total of the number of differential tables per pair, , would be (1 x 10) + (4 x 20) = 90.
Because 90 is smaller than 2,048 (when the number of CUs is equal to or less than 4) or 4,096 (when
the number of CUs is equal to or more than 5), it meets the equation, , thus ensuring you that
10 pairs of 3390-3 volumes and 20 pairs of 3390-L (32,760 CYL) volumes can be created.
Note that the maximum number of pairs that you can create is limited to the number of volumes that are
installed.
ShadowImage Operations
SI390 operations can be performed using the SI390 using the Command View XP or XP Remote Web
Console Java™ applet program for SI390, or from the zSeries and S/390 host using TSO and/or ICKDSF
commands. For more information on using TSO/ICKDSF commands to set up and maintain SI390 volume
pairs, refer to ” Using PPRC Commands for ShadowImage ” on page 68. Your HP representative can also
perform SI390 operations for you using the XP128/XP1024/XP10000/XP12000 service processor (SVP).
For information on SI390 configuration services, contact your HP account support representative.
Setting/Resetting Reserve Attribute Operation
The SI390 set reserve attribute operation reserves a volume so that it can be used as an SI390 T-VOL.
Reserved volumes can be used only as SI390 T-VOLs. The XP128/XP1024/XP10000/XP12000 rejects all
write operations to reserved volumes (unless in split status). You can reserve up to 4,096 volumes in one
XP128/XP1024/XP10000/XP12000. Use the Set Reserve Attribute window (see ” Setting the Reserve
Attribute ” on page 50) to reserve volumes for use as T-VOLs.
3390-9B 25
3390-9C 25
3390-L 23
3390-LA 23
3390-LB 23
3390-LC 23
3390-M 53
3390-MA 53
3390-MB 53
3390-MC 53
NF80-F 22
NF80-K 7
NF80-KA 7
NF80-KB 7
NF80-KC 7
Table 3 The Number of the Control Cylinders According to the Emulation Types (continued)
Emulation Type Number of the Control Cylinders
Σ α ( ) β ( ) ≤
Σ α ( )
β ( )
β ( )
β ( )
Σ α ( )
Σ α ( ) β ( ) ≤