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