Migrating from HP StorageWorks for Active-Active Disk Arrays to Native Multipathing in HP-UX 11i v3 (February 2007)

2Migration
This chapter provides inform a tion about:
• Need for migration
• Migrating to H P -UX 11i v3
Need for migration
HP-UX 11i v3 op
erating system (OS) no longer supports Secure Path. HP-UX 11i v3 has the native
multipathing capabilities.
After the OS upgrades to HP-UX 11i v3, the virtual aliases provided by Secure Path (Active-Active) are no
longer available. The applications that use Secure Path virtual aliases, start using the system provid ed
persistent D
SFs.
NOTE:
Native Multipathing introduces a persistent DSF to represent each LUN in the system. This device special
file is of the format /dev/disk/diskX (and the corresponding raw device file /dev/rdisk/diskX),
where X is a positive integer. The legacy device special files of the format /dev/dsk/cXtYdZ still
remain, with the difference that these legacy device files are still created for each path to the end LUN
and are path specificinnature.
Migrating to HP-UX 11i v3
This section provides information about:
• Migration script
• Migration process
Migration scr ipt
Secure Path migration scripts for Active-Active disk arrays are integrated with the HP–UX 11i v3 upgrade
kit and are invoked automatically when the OS upgrades to HP-UX 11i v3.
The migration scripts perform the following actions:
• Uninstall the HP StorageWorks Secure Path for Active-Active and Active-Passive disk arrays, if
present in the system.
• Map the pseudo DSF provided to the LUNs by Secure Path for Active-Passive disk arrays to their
corresponding LUN WWN.
This information is stored in the /opt/HPswsp_migration/SecPath_AP_CTD_to_
LunWWN.txt file.
Each line in this file is of the format: <CTD> <LunWWN>
Where: <CTD> is the CTD assigned to a LUN by Secure Path for Active-Passive disk arrays, and
<LunWWN> is the WWN of the LUN.
• Maps the virtual aliases p rovided to the LUNs by Secure Path for Active-Active disk arrays to their
corresponding HP–UX 11i v3 disk device special file.
This information is stored in the /opt/HPswsp_migration/SecurePathVDsf_To_Na-
tiveMultipathingDsf.txt file.
Each line in the file is of the format: <SecurePathAlias>:<NewStyleDSF>
Migrating from HP StorageWorks Secure Path for Active-Active Disk Arrays to Native Multipa thing in
HP-UX 11i v3
7