HP-UX HB v13.00 Ch-06 - Ignite-UX

HP-UX Handbook – Rev 13.00 Page 37 (of 58)
Chapter 06 Ignite-UX
October 29, 2013
Mapping between device special files and devices cannot be
restored during recovery – known issue C.7.0.
During recovery on a system that has more than seven disk and tape devices, Ignite-UX may not
successfully remap the device special file names so that they refer to the original devices.
Because of this problem, the make_net_recovery and make_tape_recovery commands on HP-UX
11i v3 print a WARNING message and prompt the user to confirm that they wish to continue.
When scripts encounter this prompt, they may hang or fail depending on how the script handles
stdin. HP does not support Ignite-UX version C.7.0, even for cold installing HP-UX, after
September 2007.
HP recommends that you upgrade to Ignite-UX version C.7.1.x or later to fix this problem. After
installing Ignite-UX version C.7.1.x, recreate your tape recovery archive. For network recovery,
you can update your Ignite server to Ignite-UX version C.7.1.x and you do not need to recreate
the recovery archive.
Ignite-UX and SAS Devices
SAS disks are identified to a system with a unique World-Wide Name (WWN) also known as a
World-Wide ID (WWID, sometimes referred to as SAS Address). The I/O stack on HP-UX 11i
v2 internally associates that WWN to a hardware path. The hardware path is not a typical
hardware path since the hardware path can change if you reinstall or recover the system and the
SAS configuration has changed.
On HP-UX 11i v3 the legacy devices for SAS devices are handled similarly to 11i v2, this means
if the SAS configuration changes, the legacy devices for SAS devices can change during an
install or recovery.
With persistent DSFs on 11i v3 there is a reliable mapping between a SAS device and the
persistent DSF. Since the system knows about the correlation between the WWN and the
persistent DSF² Ignite-UX is able to keep the mapping between persistent DSF and WWN when
performing a recovery. This requires you to use Ignite-UX version C.7.2 or above to be able to
reliably recover persistent DSFs for SAS devices when you have more than 7 mass storage
devices connected to a system
Note: You will have actions to perform when replacing a SAS device on HP-UX 11i v3 since a
persistent DSF is tied to a WWN. See the io_redirect_dsf manual page on any HP-UX 11i v3
system for more information. If you use legacy devices you may also need to use the sasmgr
commands replace_tgt option.
You should be aware of the following information when you configure RAID LUNs.