Friday, May 10, 2013

Configuring HP-UX 11i for the HP LeftHand SAN



Follow these steps to configure the iSCSI initiator, incl
uded in the installation of HP-UX 11i, to use with
the HP LeftHand SAN.
Step 1: Verify the iSCSI initiator is running
To verify that the iSCSI initiator is running
, in HP-UX 11i execute the following command:
iscsiutil –l
This returns something similar to the following:
Initiator Name :
iqn.1986-03.com.hp:hpntc916.Z3e113981e2afd927
Initiator Alias :
Authentication Method :
CHAP Method : CHAP_UNI
Initiator CHAP Name :
CHAP Secret :
NAS Hostname :
NAS Secret :
Radius Server Hostname :
Header Digest : None,CRC32C (default)
Data Digest : None,CRC32C (default)
SLP Scope list for iSLPD :
Use the initiator node name (shown here in bold) to register the server in the CMC as detailed
in the
HP SAN/iQ Software Users Guide
.
Step 2: Add the discovery target address
To add the discovery target address or addresses,
run the following command using the virtual IP
(VIP) address in the cluster:
iscsiutil –a –I (Virtual IP)
(Note that there is no confirmation output of this command.)
2

Step 3: Confirm connection to volume targets
Run the following command to ensu
re that the initiator was able to establish a connection to
the volume targets:
iscsiutil –p –D
This returns discovery target informatio
n, which looks similar to the following:
Discovery Target Information
----------------------------
Target # 1
-----------
IP Address : 10.160.32.21
iSCSI TCP Port : 3260
iSCSI Portal Group Tag : 1
User Configured:
----------------
Authentication Method :
CHAP Method : CHAP_UNI
Initiator CHAP Name :
CHAP Secret :
Header Digest : None,CRC32C (default)
Data Digest : None,CRC32C (default)

 In this example, there are 1 volumes.
Note:
The iSCSI sessions were not configured us
ing CHAP, SLP, or any form of digest.
For information on these options, use the
HP SAN/iQ Software Users Guide
and the
iscsiutil
man pages.
Step 4: Confirm HP SAN/iQ

Software volumes
To confirm that HP-UX has operating HP SAN/iQ
Software volumes, and to discover the logical
device files for the targets,
enter the following command:
ioscan –fnH 255
This command returns something similar to the following:
Class I H/W Path Driver S/W State H/W Type Description
===========================================================================
ext_bus 21 255/0/3.0 iscsial CLAIMED INTERFACE iSCSI-SCSI
Protocol Interface
disk 1032 255/0/3.0.0.0 sdisk CLAIMED DEVICE
LEFTHANDiSCSIDisk
/dev/dsk/c21t0d0 /dev/rdsk/c21t0d0
ext_bus 22 255/0/6.0 iscsial CLAIMED INTERFACE iSCSI-SCSI
Protocol Interface
disk 1033 255/0/6.0.0.0 sdisk CLAIMED DEVICE
LEFTHANDiSCSIDisk
/dev/dsk/c22t0d0 /dev/rdsk/c22t0d0
ext_bus 24 255/0/12.0 iscsial CLAIMED INTERFACE iSCSI-SCSI
Protocol Interface
disk 1035 255/0/12.0.0.0 sdisk CLAIMED DEVICE
LEFTHANDiSCSIDisk
/dev/dsk/c24t0d0 /dev/rdsk/c24t0d0
There is an entry for each target or volume.
Note:
HP-UX has a limit of 256 block device targets. Af
ter the initial discovery, HP-UX creates a single
logical device for each new device
target (volumes and snapshots) it finds on the HP LeftHand SAN.
Once the HP-UX iSCSI initiator recognizes a target, yo
u need to clear devices from the kernel registry.
See “
Clearing the kernel registry
” below for details of the procedure to clear devices from the kernel
registry.
Step 5: Start using the iSCSI volumes
You can now begin using the iSCSI volumes as you
would any direct-attached disks, either as raw
disks or by formatting the disks.
Clearing the kernel registry
HP-UX accommodates 256 iSCSI sessions and does
not clear block device links to old targets
including deleted snapshots. You must manually clear the registry of stale sessions once this
maximum is reached in order to
establish new iSCSI sessions. Note that clearing the kernel
registry clears out all configurations, so afte
r clearing you will need to recreate any old
configurations you want to preserve.
Here is the procedure to clear out your iSCSI configuration from the kernel registry:
1.
Before deleting all the iSCSI information in the registry and rebooting the system, preserve
the original configuration as follows:
# ioscan -kfn > /tmp/ioscan.pre_shutdown.out
# iscsiutil -p > /tmp/iscsi_tgt.pre_shutdown.out 
2.
Delete all iSCSI information from the registry (all steps must be done as root):
# echo "iscsi_krs_delete/W 1" |adb -w /stand/vmunix /dev/kmem
(assuming system was booted
from /stand/vmunix ...)
# iscsiutil –x
3.
Reboot the system immediately.
4.
Once the system is back online, you will have
to recreate your iSCSI configuration.
This completes the procedure for configuring HP-UX 11i for use with the HP L