Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Scaricare il pdf (Pagina 260)

240 z/VM and Linux on IBM System z: The Virtualization Cookbook for Red Hat Enterprise Linux 6.0

14.1 Using INDICATE and other commands

z/VM has many commands to monitor the state of the system. CP INDICATE is the most

commonly used, and there are other commands that are addressed. For more information,

see the z/VM Performance Resources web page at

http://www.vm.ibm.com/perf/

14.1.1 Using the INDICATE command

z/VM has some basic commands such as INDICATE. There are many INDICATE parameters

that can be included as command line options. Use the command HELP INDICATE for a

basic understanding and then press F11 for help on each parameter.

INIDICATE LOAD

If no parameter is specified, INDICATE LOAD is the default option. There are two flavors of

this, depending on whether the issuing user ID has privilege class G or class E. Class G

users can use INDICATE to display recent contention for system resources, environment

characteristics, and measurements of resources used by their virtual machine.

The output from a user ID with class E privilege (for example, MAINT and OPERATOR) is

shown here. The lines are numbered for clarity of the description that follows:

==> ind load

1 AVGPROC-038% 03

2 XSTORE-000021/SEC MIGRATE-0001/SEC

3 MDC READS-000068/SEC WRITES-000001/SEC HIT RATIO-099%

4 PAGING-0031/SEC STEAL-000%

5 Q0-00006(00000) DORMANT-00357

6 Q1-00001(00000) E1-00000(00000)

7 Q2-00001(00000) EXPAN-002 E2-00000(00000)

8 Q3-00034(00000) EXPAN-002 E3-00000(00000)

10 PROC 0000-038% PROC 0001-038%

11 PROC 0002-038%

13 LIMITED-00000

The INDICATE LOAD command gives a snapshot of current system performance. Except for

the counts of virtual machines in various queues and the limited list, the values you see here

are a smoothed average over the past 4 minutes. Areas on which z/VM performance analysts

tend to focus are the following:

򐂰 AVGPROC on line 1 gives the overall processor utilization, 38% in this example. The number

following it is the number of online processors, 3 in this example. The individual processor

utilization is shown on lines 10 and 11. Take a glance at these to see if they are somewhat

balanced. There are cases where an imbalance is okay. This would include low utilization

scenarios or cases where there are not enough users ready to run virtual processors to

keep the physical processors busy. One of the processors will be a Master, all of the

others Alternate, and some imbalance may result from performing these functions.

Line 2 describes paging to expanded storage. Most z/VM systems on z9 class machines

can sustain several 1000s of this type of paging operations a second without any

problems. z10 class machines will perform even better. The MIGRATE rate is the number of

pages per second being moved from expanded storage out to paging space on DASD. A

healthy system will have a MIGRATE rate significantly lower than the XSTORE rate, probably

1 2 ... 255 256 257 258 259 260 261 262 263 264 265 ... 295 296

Commenti su questo manuale

Nessun commento

Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION Manuale di Installazione Pagina 260

Commenti su questo manuale

Prodotti e manuali riguardandi Software di system management Red Hat LINUX VIRTUAL SERVER 4.6 - ADMINISTRATION