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14 SVA Path User’s Guide

The spmon Command

The spmon command is primarily associated with load monitoring

and balancing of SVA Path functional devices (FDevs). FDev is a

logical disk as viewed by the host operating system, the

applications and the users. An Fdev can emulate one of a variety

of SCSI and count-key-data (CKD) disk devices.

Note: For optimum performance when striping data across

multiple LUNs, disable load balancing on the devices being

striped using the

setsp -b0 option.

Configuring Load

Balancing

Load balancing is enabled or disabled using

setsp -l all -b0

(disable) or

setsp -l all -b1 (enable) commands, with the

default setting being load balancing is enabled. Parameters for

load balancing are stored in the configuration file

/etc/spmon.conf. This file is read automatically after each

modification at the end of the expiration of the last measurement

interval.

Following is a listing of available parameters in

/etc/spmon.conf:

•

balance-threshold percentage

This parameter is used to specify the maximum difference in

load on the high and low paths that is permitted before the

paths will be considered imbalanced. The load balancing

-u{0|1|2}

show devices by their configuration status:

-u0 shows all available devices;

-u1 shows configured disks;

-u2 shows unconfigured disks

-v

runs a command in verbose mode

Table 3-1 setsp Command Options

Option Effect

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 67 68

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Seagate ST39103LC Guida Utente Pagina 24