IBM ZVM - FOR LINUX V6 RELEASE 1 Getting Started page 148

Steps for analyzing performance and capacity
Before you begin: You need to set up Performance Toolkit for VM and the Web
interface for Performance Toolkit for VM. See "Configuring Performance Toolkit for
VM" on page 124.
Perform these steps to analyze performance and capacity:
1.
2.
If you want
to check for
possible ...
Storage
constraints
I/O
constraints
134
z/VM: Getting Started with Linux on System z
Open your Web browser to the z/VM host and port for Performance Toolkit
for VM.
Base your next action on this table.
Tip: For an explanation of the columns in a panel, click the column heading.
Then check these
screens ...
For the whole system:
2. Storage utilization
For Linux guests:
21. User resource usage
22. User paging load
29. Linux systems, then
"LXMEM userid" where
userid is the virtual
machine user ID
11. Channel load
13. I/O device load
Notes
Presents overall storage information for the z/VM
system.
If user paging activity shows significant page
migration rates below the 2 GB line (the ">2GB>"
column) the system is constrained below the 2 GB
line. In other words, the Control Program is
thrashing on frames below 2 GB.
If you look at the details of a particular virtual
machine you see the storage details for that virtual
machine: working set size, pages resident above
and below 2G, and so forth.
Check "Swap-in rate" and "Swap-out rate."
Busy channel paths on this screen can be an
indication of I/O performance bottlenecks.
This screen indicates I/O device throughput.