Seagate ST39103LC Betriebsanweisung PDF herunterladen (Seite 34)

24 SVA Path User’s Guide

• Status shows the current state of the path. Good paths are

functioning normally.

Bad paths have failed.

•

Primary shows which of the physical I/O paths connecting

the device to the host’s host bus adapters (or controllers) is

defined as primary (marked by an X). Initially, primary path

assignments are distributed evenly among the available

paths. Figure 3-1, “Sample Output of setsp -a

Command” shows this as an alternating pattern in a dual-

path configuration:

spd0 has a primary path to controller 7,

spd1 uses its path to controller 8 as primary, and spd2

alternates back to controller 7. The device’s duplicate path(s)

are not used unless the primary path fails or the load

balancing option is selected for that device.

•

Exclude indicates the exclusion setting, which is used to

keep particular servers from seeing particular logical drives.

As a safety measure, SVA Path excludes all devices from

host access by default, giving them an exclusion setting of

Excluded devices are marked by an

X in this column.

•

Buf is the number of buffer pointers (or buffer structures)

pre-allocated for each logical device. For peak performance,

Buf should be approximately equal to the maximum useful

queue depth of the logical unit. Values between 1 and 100 are

permitted. The default value is

32.

•

Balance indicates whether dynamic load balancing is

enabled for the device. When load balancing is enabled,

SVA Path tracks the volume of I/O on each path and

automatically sends I/O requests to the path with the lightest

I/O load.

1 means load balancing enabled. 0 means load

balancing not enabled.

•

RtrCnt is the number of times a failed I/O will be retried on

the primary path after it has tried unsuccessfully to use its

alternate path(s) and returned again to the primary. When the

specified number of retries have failed, the I/O fails. The

default value is

20. The highest value allowed is 100.

•

RtrDly is the time interval, in milliseconds, between the

retry attempts described in the preceding parameter. The

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