14 setting up sds – HP Hitachi Dynamic Link Manager Software User Manual

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3. Creating an HDLM Environment

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3.14 Setting Up SDS

If SDS is installed on an HDLM host, SDS uses the logical device file name of the

HDLM device to access the HDLM-managed device. Therefore, after you install

HDLM, you need to register the logical device file name of the HDLM device. When

uninstalling HDLM, unregister the logical device file name of the HDLM device and

set the logical device file name of the sd or ssd device.

3.14.1 Notes

When using SDS, keep the following in mind.

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 (

Y) 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:
1.

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