HP StorageWorks XPath OS 7.4.X Administrator Guide (AA-RVHDD-TE, February 2006)

XPath OS 7.4.x administrator guide 103
B Recovery kernel for XPath OS 7.4.x
The recovery kernel (RK) is a part of the XPath OS that is stored in a reserved portion of memory, protected
from erasure. This kernel provides the mechanics of the boot process: It allows the hardware to locate and
boot the proper bank. The kernel finds either bank1 or bank2 as bootable. This bank can then be used to
recover firmware.
The NVRAM value, cfgBank, dictates the bank from which to boot.
When entering NRAM values, use lowercase only. Mixed case is shown in this document for readability
only.
Software installation support environment
Software installation is supported by an FTP/TFTP server that is accessible to (that is, it resides on the same
network as) the MP Router. The server must be configured to support both FTP and TFTP services: TFTP is
used to download the recovery kernel and FTP is used to download the base firmware and other packages.
Most commonly, within the FTP/TFTP server the /tftpboot directory is used to store the uploaded kernel,
as well as the base firmware and third-party application packages.
Unlike these packages, which are provided in an RPM format, the recovery kernel is a unique, proprietary
file format.
Using the recovery kernel
The recovery kernel may be installed using the low level process monitor (PMON). Once installed, it can
be used to install the base router firmware by issuing the firmwareDownload command.
Installing the recovery kernel using the process monitor
1. Reboot the router.
2. During the boot-up process, the MP Router displays a user boot delay prompt, showing the
message:
3. Press the space bar to cause the MP Router enter PMON.
4. Enter the following commands, which are necessary to define the correct recovery kernel version and
boot server IP address:
The boot server IP address is specific to a local site; your network administrator can provide this
information. The recovery kernel version is provided with each software release.
When you issue the netLoad command, the system begins downloading the recovery kernel, writes it
into NVRAM, and then reboots the router. After the reboot completes, the system presents a recovery
kernel prompt:
Recovery Kernel%
5. After you are presented with the recovery kernel prompt, install the base package firmware as
described in “Installing the XPath OS 7.4.0 base firmware from the recovery kernel.”
Press Return to boot or any key to enter PMON
router:PMON> set bankover 1.5.x.y
router:PMON> set rootdir /
router:PMON> set basefile XPathRecoverAP7420
router:PMON> set bootserver xxx.xxx.xxx.xxx
router:PMON> set currentdnldproto tftp
router:PMON> set cfgbank bank0
router:PMON> netload -p 0xdeeddeed;g