HP StorageWorks XP Remote Web Console Software - Manual (Page 35)

ShadowImage for z/OS user guide 35
Preparing for ShadowImage Operations
System Requirements
SI390 operations involve the XP128/XP1024/XP10000/XP12000 containing the S-VOLs and T-VOLs, the
SI390 feature enabled on the Command View management station or XP Remote Web Console, and
(optional) S/390 host PPRC software functions. The SI390 system requirements are:
• XP128/XP1024/XP10000/XP12000. All XP128/XP1024/XP10000/XP12000 hardware,
microcode, and software required for SI390 operations must be installed and enabled.
• Command View management station (user-supplied Windows®-based PC) or XP Remote Web
Console.
NOTE: You must operate the Command View management station or XP Remote Web Console in
Modify mode to perform SI390 operations. Users in view mode can only view SI390 information.
• SI390 feature license key installed.
Preparing for ShadowImage Operations
To ensure that the XP128/XP1024/XP10000/XP12000 is ready for SI390 operations, perform the
following tasks:
• SI390 operations affect the I/O performance of the XP128/XP1024/XP10000/XP12000 because of
the additional write operations to the T-VOLs. If you have not already done so, you should consider the
relative importance of the disk array’s I/O performance and the backup SI390 copies. For example,
assigning three T-VOLs to each S-VOL takes more resources than assigning only one or two. You can
also use the SI390 copy pace option to reduce the impact of the SI390 initial copy operations. Using a
slower copy pace minimizes the impact of zSeries and SI390 operations on I/O performance, while a
faster copy pace produces point-in-time copies more quickly but may affect I/O performance. The
SI390 initial copy operation is performed only once to each T-VOL (unless the pair is suspended).
• Identify the volumes (LDEVs) that will be the SI390 volumes. For each volume, write down the CU image
and LDEV ID, whether the volume will be an S-VOL or T-VOL, and the other volume(s) in its pair (see
Table 9 on page 35 for a sample table). The S-VOLs will remain fully accessible to all hosts throughout
normal SI390 operations (except during reverse resync and quick restore). The T-VOLs will need to be
varied offline before being reserved for SI390 operations. After assigned to a pair, a T-VOL rejects all
write I/Os, except when the pair is split.
• SI390 and TC390 can function together in the same XP128/XP1024/XP10000/XP12000 to provide
both internal and remote backup for your important data. If you are planning to combine SI390 and
TC390, read the important configuration information in ” Combining ShadowImage and TrueCopy
Operations ” on page 36.
Table 9 Sample table for ShadowImage configuration information
CU # LDEV S-VOL? Associated T-VOL(s) T-VOL? Associated S-VOL
0 00 Yes 0:10, 0:11 No --
0 01 Yes 0:12, 0:13 No --
etc. … … … … …
0 0F Yes 0:2E, 0:2F No --
0 10 No -- Yes 0:00
0 11 No -- Yes 0:00
0 12 No -- Yes 0:01
etc. … … … … …