scsimgr_eschgr(7)scsimgr_eschgr(7)NAMEscsimgr_eschgr - SCSI class driver eschgr plug-in for scsimgr
DESCRIPTION
The SCSI class driver plug-in for implements management and diagnostic
operations specific to classes of devices bound to the driver. 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
· Display and clear driver 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 on LUNs
bound to it.
· Get, set and save driver global and per-lun instance attributes.
Commands
The user can explicitly send the following commands to driver plug-in
by specifying the
Clears statistics.
Displays information on attributes.
Displays status and other information.
Displays statistics.
Saves value of attributes in a persistent store.
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 global statistics, attributes or status information. In all
the other cases, automatically invokes the plug-in to perform the
driver specific part of the operation, when the operation applies to
LUNs bound to driver or to their LUN paths.
Attributes
The following table lists driver 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
────────────────────────────────────────────────────────────────
Global version RO string Version of driver
eschgr
────────────────────────────────────────────────────────────────
LUN default_secs RW uint32 Timeout for all com‐
mands not referenced
below.
Default: 30
────────────────────────────────────────────────────────────────
move_secs RW uint32 Timeout for the move
command.
Default: 1200
────────────────────────────────────────────────────────────────
readelem_secs RW uint32 Timeout for the read
element status command.
Default: 600
────────────────────────────────────────────────────────────────
initelem_secs RW uint32 Timeout for the ini‐
tialize element status
command.
Default: 600
────────────────────────────────────────────────────────────────
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 driver uses 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. But with the support of the attribute beginning in
the HP-UX 11i v3 March 2009 Update, it lets users select a lunpath
among available lunpaths to the device, which will be locked down and
I/O's will be issued on the newly selected lunpath. Please refer to the
attribute table in scsimgr(1M) for more information on the attribute.
EXAMPLES
To display plug-in general help and supported commands:
To get driver global statistics:
To clear driver global statistics:
To get driver global status information:
To display information about driver global attributes:
AUTHOR
SCSI class driver plug-in for was developed by HP.
SEE ALSOscsictl(1M), scsimgr(1M), autochanger(7), intro(7), scsi(7).
scsimgr_eschgr(7)
