HP-UX Reference (11i v3 07/02) - 7 Device (Special) Files, 9 General Information, Index (vol 10)

s
scsimgr_esdisk(7) scsimgr_esdisk(7)
NAME
scsimgr_esdisk - SCSI class driver esdisk plug-in for scsimgr
DESCRIPTION
The SCSI class driver esdisk plug-in for scsimgr
implements management and diagnostic operations
specific to classes of devices bound to the
esdisk driver. esdisk is the native HP-UX SCSI class driver
that handles, by default, all block devices including the following types : direct access, CD/DVD, write-once
read-multiple (WORM), and optical memory (OM).
The plug-in handles the following operations for driver
esdisk:
• Displays and clears driver
esdisk global statistics and the statistics it maintains on instances of
LUNs bound to it, and on related LUN paths.
• Displays status and other information maintained by driver
esdisk on LUNs bound to it.
• Gets, sets, and saves driver
esdisk
global, per-lun instance attributes or attributes for a set of dev-
ices bound to the driver.
Commands
The user can explicitly send the following
scsimgr commands to driver esdisk plug-in by specifying the
-d esdisk 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 instance when it is necessary to explicitly send a command to the plug-in is when per-
forming operations on objects global to driver esdisk: global statistics, attributes or status information.
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 esdisk or to their LUN paths.
Attributes
The following table lists driver esdisk specific attributes. Also, under the category "Device Set", it lists
the attributes the esdisk driver can set at scopes; including, device type, vendor identifier, product
identifier and product revision. On the concept of attribute and attribute scope, refer to scsimgr (1M).
Note: The following conventions are used :
• RO is Read Only.
• RW is Read Write.
• uint32 is unsigned 32 bit integer.
• Range of values for applicable attributes is listed.
Object Attribute Name RO/RW Type Description
Version of driver esdiskGlobal version RO string
Device capacity in number of blocksLUN capacity RO uint32
Block size in bytesblock_size RO uint32
Delay in seconds before declaring a LUN path offline
after failure of first I/O.
Range: 0-600
path_fail_secs RW uint32
I/O load balancing policy. May be:
round_robin,
least_cmd_load,
cl_round_robin,
load_bal_policy RW string
172 Hewlett-Packard Company − 1 − HP-UX 11i Version 3: February 2007