IBM ZVM - FOR LINUX V6 RELEASE 1, Getting Started

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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.
Open your Web browser to the z/VM host and port for Performance Toolkit
for VM.
2.
Base your next action on this table.
Tip: For an explanation of the columns in a panel, click the column heading.
If you want
to check for
possible ...
Then check these
screens ...
Notes
Storage
constraints For the whole system:
2. Storage utilization Presents overall storage information for the z/VM
system.
For Linux guests:
21. User resource usage
22. User paging load 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.
29. Linux systems, then
“LXMEM
userid ” where
userid is the virtual
machine user ID
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.”
I/O
constraints 11. Channel load Busy channel paths on this screen can be an
indication of I/O performance bottlenecks.
13. I/O device load This screen indicates I/O device throughput.
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z/VM: Getting Started with Linux on System z