Specifications
CCL (command control LUN) or pass-through LUN. This LUN passes commands to
the ESS controller. Future versions of ESS LIC will automatically allocate this LUN.
IBM recommends that the first volume on the ESS as a minimum size volume. The
host should not use the volume for data storage for data storage or any other
purpose. Setting up this LUN 0 will minimize difficulties during future LIC migrations.
Each ESS LSS will assign the first volume as LUN 0. Therefore, a typical
configuration may have multiple LUN 0s. It is advisable to make each LUN 0 a
minimum size and not use it for data storage.
Confirming storage connectivity
The following procedures describe how to confirm storage connectivity
1. Restart the host (non-clustered configurations) or each cluster member
(clustered configurations)
2. Bring each host system to a halt condition at the console level.
Setting an ESS volume as a boot device
All cluster member boot partitions must exist on shared external storage.
Non-cluster boot partitions might also exist on external storage.
Perform the following steps to set an ESS volume as a boot device.
1. Determine which ESS volume you want to use as a boot device for each host
by decoding the serial number.
2. Assign one of the paths to the bootdefdev AlphaServer console value.
3. For initial installations, install the operating system and clustering software and
register the operating system and clustering licenses.
Verifying the attachment of the ESS volumes
To verify the attachment of the ESS volumes, use the hwmgr command. See
Figure 11 for an example of the commands you can use to verify the attachment of
the ESS volumes.
# hwmgr -view dev -cat disk
HWID: Device Name Mfg Model Location
------------------------------------------------------------------------------
54: /dev/disk/floppy0c 3.55in floppy fdi0-unit-0
60: /dev/disk/dsk1c DEC RZ2DD-LS (C) DEC bus-2-targ-0-lun-0
63: /dev/disk/cdrom0c COMPAQ CDR-8435 bus-5-targ-0-lun-0
66: /dev/disk/dsk5c IBM 2105F20 bus-0-targ-253-lun-0
67: /dev/disk/dsk6c IBM 2105F20 bus-0-targ-253-lun-1
68: /dev/disk/dsk7c IBM 2105F20 bus-0-targ-253-lun-2
:
:
# hwmgr –get attributes –id 66
66:
name = SCSI-WWID:01000010:6000-1fe1-0000-2b10-0009-9010-0323-0046
category = disk
sub_category = generic
architecture = SCSI
:
:
Figure 11. Example of what is displayed when you use the hwmgr command to verify
attachment
24 ESS Host Systems Attachment Guide
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|