I have some question about the sysplex in Z/OS(MVS)

[yaloml]

Hi guys, I'm a new bee to Mainframe and I have some doubts about the sysplex.

When we performing an IPL for the sysplex(A,B are in sysplex),After we shut down A,Why we need to vary A out of the sysplex?

As far as I know,sysplex is designed to share a workload for high performance and high availability,that means if one system(A) in the sysplex have some fatal error and stop working,all the work will be assigned to the healthy one(B).

If I'm right, When we performing an IPL on A and do not vary it out of sysplex, It will be fine for system B, the reason why we need to vary it out of sysplex , is just ensure the performance of systemB?

[NicC]

Have you asked your system programmers (sysprogs)? As a newbie why do you need to know this? Surely just knowing it happens is, possibly, more than enough.

[yaloml]

Nic:Have you asked your system programmers (sysprogs)? As a newbie why do you need to know this? Surely just knowing it happens is, possibly, more than enough.

thx for your suggestion, I will ask sysprog later...

[Robert Sample]

From the z/OS Migration manual:

Before a system can be |removed from the sysplex, it must be reset or isolated from the channel |subsystem to ensure that it is no longer performing I/O against shared |sysplex resources such as data sets or coupling facility structures.

[yaloml]

Before a system can be |removed from the sysplex, it must be reset or isolated from the channel |subsystem to ensure that it is no longer performing I/O against shared |sysplex resources such as data sets or coupling facility structures.

hmm,got it,actually better understanding can avoid some stupid mistakes,eg. vary the wrong system out of sysplex

Thx