Seagate ST39103LC User's Guide download pdf (Page 37)

Chapter 3. SVA Path Operation 27

All devices may be included, as they present no conflicts.

However, in a multiple-host environment, where all spds are

visible to SVA Path on all hosts, spds must be either excluded or

included so that a host shares no spds. Use the ID number under

the

spd column on the setsp -a output to identify devices. Do

not use the spdX number.

Redefining the

Buffer Pointer

Allocation

The syntax for changing the number of buffer pointers pre-

allocated for a given device is

setsp -l<x> -n<n>

where <x> is the spd number (see “Specifying a Device for setsp”

on page 25) and <n> is the new value. The system must be

rebooted for this change to take effect. The number of buffer

pointers recommended for a given device is approximately equal

to the logical unit’s maximum useful queue depth; the default

value of

32 should suit most SVA devices.

Turning Load

Balancing On and

Off

The syntax for changing a device's load balancing mode is

setsp -l<x> -b{0|1}

where <x> is the spd number and the -b option takes one of two

arguments:

•

-b0 turns load balancing off;

•

-b1 turns load balancing on.

Changing the Retry

Count and Retry

Delay

The syntax for changing the retry count for a device is

setsp -l<x> -r<n>

where <x> is the numerical element of the spd number (see

“Specifying a Device for setsp” on page 25) and <n> is the number

of times a failed I/O will be retried on the primary path (after its

alternate paths have been tried unsuccessfully) before the path is

marked as failed (with a

Status of Bad).

The syntax for changing the retry delay for a device is

setsp -l<x> -d<n>

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