Preparing for shadowimage operations, System requirements – HP StorageWorks XP Remote Web Console Software User Manual

Page 35

ShadowImage for z/OS user guide

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

Yes

0:10, 0:11

Yes

0:12, 0:13

etc.

…

Yes

0:2E, 0:2F

Yes

0:00

Yes

0:00

Yes

0:01

etc.

…