VMO

Tuning vmo settings allows you to favor either working or persistent storage.

And that's how you can significantly reduce paging on your AIX system using vmo.

The vmo command can be used to configure the size of the large page physical memory pool using the lgpg_regions and lgpg_size options.

In this section, we use vmo to tune paging parameters that can significantly reduce the amount of paging on your systems.

And that's how you can significantly reduce paging on your AIX 7 system using vmo.

The vmo command also displays and adjusts the Virtual Memory Manager parameters.

In tuning vmo parameters, you can help set the thresholds when thrashing starts.

In looking at the freelist with the vmo command, you determined that the number was 120.

This setting is determined by the minfree parameter of the vmo command.

Let's look at the parameters, using vmo, as shown in Listing 1.

In AIX 7, the vmo tool is responsible for all of the configuration of the tunable parameters of the VMM system.

To set these to be persistent across system reboots, enter "vmo -p -o maxperm%=10 -o maxclient%=10. "

The no command is similar to vmo and ioo, but no is the network flavor.

The performance parameters were also checked using the vmo command.

The vmo command is used to interact with VMM tunable parameters.

Like pagein scrubbing, the operation is configured by vmo.

Listing 13 uses the vmo command with the -a option to display the values for lrubucket.

Tuning of VPSS can be managed using the vmo tuning tool.

All settings can configured using the vmo tool.

However, 16-megabyte and 16-gigabyte page sizes require AIX 5L configuration using the vmo command.

While observing the output of the vmo command, we noticed that lgpg_regions is set to 256 and lgpg_size is 16777216 (or 64MB).

As shown in Listing 2, the default is 1, so we'll need to change this using vmo (see Listing 3).

With AIX 5. 3 and older, we will use vmo; prior to that, we used vmtune.

By far, the two most important vmo settings are minperm and maxperm.

This is done using the vmo command.

Oblique Derivative Problem for Quasilinear Parabolic Equations With VMO Coefficients

These tunable parameters can be set with the vmo command (see Listing 6)

A Novel Idea of VMO-based Integrated Management

Table 1. List of vmo parameters and tuning recommendations

You can change them by using the vmo command