Registering hdlm devices, Registering hdlm devices -171, To use a local metadevice -171 – HP XP P9500 Storage User Manual

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Even if you use a local diskset or shared diskset, do not specify the -r

option when changing the path configuration and executing the
dlmsetconf utility for creating the HDLM driver configuration definition

file. When you specify the -r option, the minor number of the HDLM

device used on the SDS will be changed, and you will no longer be able to

use the metadevice.

•

Even if you use a local diskset or shared diskset, you cannot use the

DiskSuite tool (metatool). Use the command line utility instead. Also,

when you set up a metadevice, do not use the -a option of the metainit

command. Register the database on the command line, and then register

the metadevice.

•

Specify the same name for the logical device file name (cUtXdY) of the

HDLM device on all the hosts that belong to a single shared diskset.

•

When a shared diskset is used, specify the same major number and minor

number for the physical device files of the HDLM devices on all hosts that

belong to that shared diskset.
Executing the following command enables you to check the major number

and minor number for the physical device file of the HDLM device.

# ls -lR /devices/pseudo | grep dlmfdrv

To specify the same major number and minor number for the physical

device files of the HDLM device on each host using the shared diskset:

View the /etc/name_to_major file on each host, and then select a

major number that is not used on any host.

Edit the /etc/name_to_major file to set the major number of the

HDLM filter driver (dlmfdrv) to the number you chose above.

Restart all the hosts, specifying either of the following commands:
# reboot -- -r
or
boot -r (at the ok prompt)

For more information on SDS settings, refer to the SDS documentation.

Registering HDLM Devices

If both HDLM and SDS are used on the same host, perform the following

settings after installing HDLM.

To Use a Local Metadevice

To use a local metadevice:

Create a replica of the state database.
Create three replicas of the local state database on the disk (slice).

Create these replicas on a disk that is not managed by HDLM, not shared,

and has not been connected to a Fibre Channel.
The following shows an example of executing the command:

Creating an HDLM Environment

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