SHOW VSAMIO is not part of the regular HELP SHOW command output.
Nevertheless it is discussed at both these places:
--Publication CA Mainframe Network Management Reference Guide (r 12.1)
--DocOps for CA NetMaster Shared Content Library (r12.2)
This is the information from the Reference Guide (r12.1):
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VSAM Processing in a Subtask
You can nominate VSAM I/O to be performed by a subtask rather than the System Services main task.
This provides increased throughput by overlapping VSAM processing. To nominate a subtask
to perform VSAM I/O, use the VSAMIO JCL parameter.
Note: Using a subtask is only useful when there is significant VSAM processing and
you have a multi-CPU machine.
You can use the SHOW VSAMIO command to obtain statistics of VSAM processing.
Example
Following is an example of SHOW VSAMIO command output:
(18.51)---------------- Operator Console Services (OCS) -----------------------
show vsamio
N13A10 VSAM I/O MANAGER STATISTICS.
N13A11 MODE: DYNAMIC MOLAP: 20 MBPWAIT: 5 DSTS: 2 DSTM: 0 REQS: 173K
N13A12 TASK REQUESTS COL POL TIMES-POL NOWAIT PSWAIT PENDING
N13A13 MAIN 133K 0 2 1229 111K 11107 –
N13A13 SUB 39491 0 5 1 37542 - 0
N13A14 OLAP M/T S/T N13A15 0 0 7300
N13A15 1 21145 1448
N13A15 2 1229 237
N13A15 3 0 22
N13A15 4 0 2
N13A15 5 0 1
N11907 *END*
==> show vsamio
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Please find the SHOW VSAMIO messages at these locations:
(r12.1) https://docops.ca.com/ca-netmaster-shared-content-library/12-1/en/messages/n0x-to-n1x-messages#N0xtoN1xMessages-N13A10
(r12.2) https://docops.ca.com/ca-netmaster-shared-content-library/12-2/en/messages/n0x-to-n1x-messages