Alternate Data Paths (GridStor) - How To
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Configure Data Paths for Storage Policies
Configure Data Paths for Subclients
Required Capability: See
Capabilities
and Permitted Actions
To configure
multiple data paths for a storage policy copy:
- Select the criteria under which a storage policy copy must use an alternate
data path, as described in
Select
the Criteria for using an Alternate Data Path.
- Depending on the criteria selected for using an alternate data path, you
may have to share the indexes as described in
Create Shared Index
Cache.
- Add the data paths to storage policy copies for which you wish to add multiple
data paths, as described in
Add a Data
Path to a Storage Policy Copy.
The storage policy copy will automatically switch to an alternate data path,
when the preferred data path is either offline or busy, as established in the criteria
for using an alternate data path.
Required Capability: See
Capabilities
and Permitted Actions
To select
the criteria for using an alternate data path for a storage policy copy:
- From the CommCell Browser, right-click the storage policy copy for which
you select the criteria for using an alternate data path, then click Properties.
- Click the
Data Path configuration tab.
- Select the Automatically add datapaths for existing library option,
if you are using shared libraries.
- Choose from the following options:
Choose the Use Alternate Data Paths only when option to indicate that
alternate data paths must be used only when resources are busy and/or resources
are offline. If you wish to choose this option, and wish to use some or all
available resources in the CommCell, you must first share the index cache as
described in Create
Shared Index Cache.
- Select the When Resources are Offline checkbox, to indicate that
the storage policy copy must use an alternate data path, when resources
are offline.
Resources are MediaAgent, Library, Master Drive Pool, Drive Pool, Drives
in the drive pool and spare media in the scratch pool associated with this
data path.
- Select Immediately to use an alternate data path at once, when resources
are offline.
- Select After and type the minimum number of hours and minutes after
which an alternate data path must be used when resources are offline
- Select the When Resources are Busy checkbox, to indicate that
the storage policy copy must use an alternate data path when resources are
busy.
Resources are all the drives in the library attached to the preferred MediaAgent.
- Select Immediately to use an alternate data path at once,
when resources are busy.
- Select After and type the number of hours and minutes after
which an alternate data path must be used, when resources are busy.
Choose the
Round-Robin between Data Paths option to automatically
fail over between all the available data paths. If you wish to choose this option,
you must first share the index cache as described in
Create
Shared Index Cache.
Choose the Use preferred datapath option to automatically perform
LAN-free backups, wherever possible.
- You can now add the appropriate data paths as described in
Add a Data Path to a Storage Policy Copy.
Create Shared Index Cache
Before You Begin
- For unix MediaAgents, if the index cache
resides on a network share, you have to manually mount the drive containing
the index cache to the local machine to be able to create a shared index
cache. Also note down the local mount path.
Required Capability:
Capabilities
and Permitted Actions
To
create a shared index cache:
- From the CommCell Browser, right-click any one of the MediaAgents
that will share the index and then click Properties.
- Click the
Index Cache tab.
- If necessary, modify the name of the index cache from the Use Dedicated
Index Cache, Name box.
- Click Share it.
The index cache name is displayed under the
Use Shared Index Cache, Name box.
- Provide details in the index cache area.
For Windows MediaAgent
- Select one of the following:
- Use Network Share - if the index cache will reside on a network
share.
- Use MediaAgent Local Drive - if the index cache will reside on
a local drive.
- In the Index Cache Directory box, type the path to the index cache
directory or use the Browse button to select the path.
- If the MediaAgent resides on a Network Share, click the Change button.
In the Change
User Account dialog box, type the user account and password that must be
used to access the Index Cache and then click OK.
- Click OK to save the configuration.
For Unix MediaAgent
- In the Index Cache Directory box, type the path to the index cache
directory or use the Browse button to select the path. If the index
cache resides on a network share, then this will be the path to network
index cache mounted locally.
- Click OK to save the configuration.
Now this index is available
to be shared from other MediaAgents.
- Right-click another MediaAgent that will share the index and then
click Properties.
- Click the
Index Cache tab.
- Click on Use Shared Index Cache and pick the name of the index cache
from the list.
- Provide details in the Index Cache area.
For Windows MediaAgent
- Select one of the following:
- Use Network Share - if the index cache will reside on a network
share.
- Use MediaAgent Local Drive - if the index cache will reside on
a local drive.
- In the Index Cache Directory box, type the path to the index cache
directory or use the Browse button to select the path.
- If the MediaAgent resides on a Network Share, click the Change button.
In the Change
User Account dialog box, type the user account and password that must be
used to access the Index Cache and then click OK.
- Click OK to save the configuration.
For Unix MediaAgent
- In the Index Cache Directory box, type the path to the index cache
directory or use the Browse button to select the path. If the index
cache resides on a network share, then this will be the path to network
index cache mounted locally.
- Click OK to save the configuration.
- Repeat steps 8 -10 on all the MediaAgents that share the index cache.
Required Capability: See
Capabilities
and Permitted Actions
To add
a data path to a storage policy copy:
- From the CommCell Browser, right-click the storage policy copy for which
you wish to add the data paths, then click Properties.
- Click the
Data Paths tab.
Note that depending on the criteria selected for using an alternate data path, you
may have to share the indexes as described in
Create Shared Index
Cache.
- Click Add.
- From the
Copy Data Path Candidates dialog box, select the data path candidates that
you wish to add.
You can select multiple candidates by holding down the CTRL key and clicking
on each of the data path candidates that you wish to select.
- Click Add.
- Click OK.
- Click OK in the Data Paths tab to save the information.
Required Capability: See
Capabilities
and Permitted Actions
To delete
a data path from a storage policy copy:
- From the CommCell Browser, right-click the storage policy copy for which
you wish to delete a data path, then click Properties.
- Click the
Data Paths tab.
- Click the data path you wish to delete from the
list.
- Click Delete.
The data path is deleted.
- Click OK to save the information.
|
- You cannot delete a data path that is set as the default data path.
- You can delete a data path when the associated storage policy is
reserved for data protection operations.
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Required Capability: See
Capabilities
and Permitted Actions
To set
a data path as the default data path from a storage policy copy:
- From the CommCell Browser, right-click the storage policy copy for which
you wish to set as the preferred data path, then click Properties.
- Click the
Data Paths tab.
- Click the data path you wish to set as the preferred data path from the list.
- Click Set Default.
The data path is set as the default data path. Notice the tick mark in the
icon displayed in the Status column.
- Click OK to save the information.
View Data Paths Associated with a Subclient
Required Capability: See
Capabilities
and Permitted Actions
To view
data paths:
- From the CommCell Browser, right-click the subclient whose data paths you
want to view, then click Properties from the shortcut menu.
- Click the Storage
Device tab of the Subclient Properties dialog box.
- From the Data [or Logs] Storage Policy tab, click Show Data Paths
to view the data paths used by the subclient to access the storage media for
data protection operations. Click Close to exit the Data Paths dialog
box.
- Click OK to exit the Subclient Properties
Storage Device tab.
Configure Data Paths for Subclients
Required Capability: See
Capabilities and Permitted Actions
To configure
data paths for subclients:
- From the CommCell Browser, right-click the subclient for which you wish
to create the data paths, and then click Properties.
- Click the
Storage Device tab.
- Click Data Paths.
- From the Data
Paths for <Storage Policy Name> dialog box, select the
Override DataPaths option. This will allow you to define the necessary
data paths at the subclient level.
- From the list of data paths displayed in the bottom pane, select the
Use option to choose a data path for the subclient.
- If necessary assign a priority as described in
Assign Priorities for Subclient
Data Paths.
- Click OK to save the changes.
The selected data paths will be used by the subclient for subsequent data
protection operations.
Assign Priorities for Subclient Data Paths
Required Capability: See
Capabilities
and Permitted Actions
To
assign priorities for subclient data paths:
- Follow the steps described in
Configure Data Paths for Subclients.
- From the Data
Paths for <Storage Policy Name> dialog box, after selecting
the data paths for the subclient by clicking the Use option, click
Priority and type a number as priority.
- If necessary, click the Refresh Priority button to sort the
display based on the established priority.
- Click OK to save the changes.
The data path with the smallest number will be established as a high priority
data path, while data paths with bigger numbers will be established as low
priority data paths.