scsimgr_eschgr.7 (2010 09)

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scsimgr_eschgr(7) scsimgr_eschgr(7)

NAME

scsimgr_eschgr - SCSI class driver eschgr plug-in for scsimgr

DESCRIPTION

The SCSI class driver

eschgr plug-in for

scsimgr implements management and diagnostic operations

speciﬁc to classes of devices bound to the eschgr driver. eschgr is the native HP-UX SCSI class driver

that handles, by default, all library/changer devices.

The plug-in handles the following operations for driver

eschgr:

• Display and clear driver

eschgr global statistics and the statistics it maintains on instances of

LUNs bound to it, and on related LUN paths.

• Display status and other information maintained by driver

eschgr on LUNs bound to it.

• Get, set and save driver

eschgr global and per-lun instance attributes.

Commands

The user can explicitly send the following

scsimgr commands to driver eschgr plug-in by specifying

the

-d eschgr option:

clear_stat Clears statistics.

get_attr Displays information on attributes.

get_info Displays status and other information.

get_stat Displays statistics.

save_attr Saves value of attributes in a persistent store.

set_attr Set current values of attributes.

Note: Refer to scsimgr (1M) for the syntax of the above commands.

However, the only instances where it is necessary to explicitly send a command to the plug-in is when

performing operations on objects global to driver

eschgr: global statistics, attributes or status informa-

tion. In all the other cases, scsimgr automatically invokes the plug-in to perform the driver speciﬁc

part of the operation, when the operation applies to LUNs bound to driver eschgr or to their LUN

paths.

Attributes

The following table lists driver

eschgr speciﬁc attributes. For details on the concept of attribute refer to

scsimgr (1M).

Note: The following conventions are used:

• RO is Read Only.

• RW is Read Write.

• uint32 is unsigned 32 bits integer.

Object Attribute Name RO/RW Type Description

Version of driver eschgrGlobal version RO string

Timeout for all commands not refer-

enced below.

Default: 30

LUN default_secs RW uint32

Timeout for the move command.

Default: 1200

move_secs RW uint32

Timeout for the read element status

command.

Default: 600

readelem_secs RW uint32

Timeout for the initialize element

status command.

Default: 600

initelem_secs RW uint32

HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1

Summary of content (2 pages)

PAGE 1
scsimgr_eschgr(7) scsimgr_eschgr(7) NAME scsimgr_eschgr - SCSI class driver eschgr plug-in for scsimgr DESCRIPTION The SCSI class driver eschgr plug-in for scsimgr implements management and diagnostic operations specific to classes of devices bound to the eschgr driver. eschgr is the native HP-UX SCSI class driver that handles, by default, all library/changer devices.
PAGE 2
scsimgr_eschgr(7) scsimgr_eschgr(7) readaddr_secs RW uint32 Timeout for modesense 0x1D command. Default: 600 exchange_secs RW uint32 Timeout for the exchange command. Default: 600 I/O Load Balancing and Multi-Pathing Policies The eschgr driver uses path_lockdown method as load balancing policy and has minimal support for multi-pathing. When the device is first opened after a system boot, a path is chosen and will remain fixed. If the path fails, the new path will be picked on next open only.