Compaq ProLiant 6400R Compaq Parallel Database Cluster Model PDC/05000 for Ora - Page 185

Monitoring Storage Systems, Manipulating Storagesets and I/O Paths

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Cluster Management 6-31 Monitoring Storage Systems The Storage System View of Secure Path Manager displays each storage subsystem, array controllers, and associated storagesets. When you highlight a storageset in Storage System View, Secure Path Manager displays information about the physical I/O paths from each node to that storageset. The following information is displayed for each path: I The Secure Path host system (node) that has an established access path to the storageset. I The array controller servicing the path. I The physical port number of the host adapter servicing the path. This is a relative number determined by Windows 2000's order of discovery for host adapters on that node. I The physical Bus, Target, and LUN number describing the path address for the storageset. I A user-selectable Path Mode parameter that specifies path behavior during nominal and failure conditions. Path Mode may be set to Preferred, Alternate, Pre-Offline (Preferred and Offline), or Alt-Offline (Alternate and Offline). I A set of State attributes that describe the current operational condition of the path. Paths may exist in Active, Failed, or Available states. Manipulating Storagesets and I/O Paths You can use Secure Path Manager to perform the following actions on the storagesets and I/O paths that are managed by Secure Path Manager: I Move a storageset from one array controller to another. Use this action when you want to change the ownership of a storageset from one array controller to the other. I Make an I/O path Alternate. Use this action when you have Load Distribution enabled and you want to disable I/O operations to one or more I/O paths. I Make an I/O path Preferred. Use this action when you have Load Distribution enabled and you want to re-enable I/O operations to a path that you have previously disabled. I Change the Preferred I/O path. Use this action when Load Distribution is disabled, there are multiple I/O paths available to a storageset on the same controller and you wish to select a new Preferred Path for normal I/O operations.

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Cluster Management
6-31
Monitoring Storage Systems
The Storage System View of Secure Path Manager displays each storage
subsystem, array controllers, and associated storagesets. When you highlight a
storageset in Storage System View, Secure Path Manager displays information
about the physical I/O paths from each node to that storageset. The following
information is displayed for each path:
■
The Secure Path host system (node) that has an established access path
to the storageset.
■
The array controller servicing the path.
■
The physical port number of the host adapter servicing the path. This is
a relative number determined by Windows 2000
’
s order of discovery for
host adapters on that node.
■
The physical Bus, Target, and LUN number describing the path address
for the storageset.
■
A user-selectable Path Mode parameter that specifies path behavior
during nominal and failure conditions. Path Mode may be set to
Preferred, Alternate, Pre-Offline (Preferred and Offline), or Alt-Offline
(Alternate and Offline).
■
A set of State attributes that describe the current operational condition
of the path. Paths may exist in Active, Failed, or Available states.
Manipulating Storagesets and I/O Paths
You can use Secure Path Manager to perform the following actions on the
storagesets and I/O paths that are managed by Secure Path Manager:
■
Move a storageset from one array controller to another. Use this action
when you want to change the ownership of a storageset from one array
controller to the other.
■
Make an I/O path Alternate. Use this action when you have Load
Distribution enabled and you want to disable I/O operations to one or
more I/O paths.
■
Make an I/O path Preferred. Use this action when you have Load
Distribution enabled and you want to re-enable I/O operations to a path
that you have previously disabled.
■
Change the Preferred I/O path. Use this action when Load Distribution
is disabled, there are multiple I/O paths available to a storageset on the
same controller and you wish to select a new Preferred Path for normal
I/O operations.