HP-UX 11i v3 Persistent DSF Migration Guide

New I/O Management Commands in HP-UX 11i v3
scsimgr
A new utility, scsimgr, is provided for management and diagnostics of SCSI objects (such as a single
LUN, LUN path, target path, host bus adapter (HBA), or a group of these) and subsystems (SCSI
services module, a SCSI class driver, or a SCSI interface, also known as interface driver). Most of the
options to this utility are used in the agile view (requiring persistent DSFs as input).
Migration to the persistent DSFs offers an enhanced experience in I/O management and diagnosis of
the mass storage stack.
For more information, see scsimgr(1M
) and the scsimgr SCSI Management And Diagnostics Utility
on HP-UX 11i v3 white paper at
http://www.hp.com/go/hpux-core-docs. Click on HP-UX 11i v3 and scroll
down to the White papers section.
io_redirect_dsf
Another new command, io_redirect_dsf, allows users to change the association of a persistent
DSF from device A to device B without a reboot and without the need to change any application
configuration information. After the operation, applications using the DSF of device A can transparently
access device B. This command only accepts persistent DSFs or LUN hardware paths.
Example:
Disk A with DSF /dev/disk/disk1 becomes non-operational. Users may want to direct any further
I/O access from disk A to disk B (with DSF /dev/disk/disk5, which is already in the system)
without rebooting and/or changing application configuration.
For more information, see io_redirect_dsf(1M).
iobind
Another new HP-UX 11i v3 command is iobind. It performs online binding of a driver to a device.
The driver must however support online binding. One of the arguments to this new command is a LUN
hardware path. Since a persistent DSF is mapped to a LUN hardware path, users can easily find out
the required hardware path from the persistent DSF by using the “ioscan –m lun [dsf_name]”
command.
For more information, see iobind(1M).
Enhanced Commands
New command line options have been added to some I/O commands to allow users to manage their
system in the agile view.
ioscan
The ioscan command has been enhanced to work with the agile view of the
I/O system. Certain options will only be applicable to this view:
o ioscan -N [other options]: Display output in the agile view.
o ioscan -b -M driver_name -H hw_path: The -b option
specifies deferred binding of a driver to the given hardware path. The
input parameter hw_path must be the LUN hardware path in the agile
view.
o ioscan -m keyword [parameters]: This option shows mapping
information between paths and/or devices. The -m option takes one of
these keywords: lun, dsf, or hwpath. Parameters to the lun
keyword must be in the agile view; parameters to the dsf and
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