Depending on the selected criteria, you may have to share the index cache for
the MediaAgent(s). Share the index cache and then add the necessary data paths.
See Index Cache for information on
index cache sharing.
Backups fail with an Index Not Available error
This might occur for the following reason:
Cause: All the MediaAgents associated with the data path candidates
may not be pointing to the same network share and
the same folder within this network share for
its index cache location..
Solution: For all the MediaAgents that are used as a data path candidate, open the Catalog tab of MediaAgent Properties, and verify whether the Index
Cache Directory points to the same network share and
the same folder within this network share for
its index cache location.
Increased media usage, after establishing data paths in the CommCell
This might occur for the following reasons:
Cause: Fail over to data path candidates may be marking the media from
last used library as Appendable resulting in partial usage of media.
If no alternate data paths are added in the primary copy, the
number of streams may be more than the number of drives available in
the library associated with the copy.
If alternate data paths are added in the primary copy, the number
of streams may be more than the sum of drives available in all the
libraries associated with all the data paths in the copy.
Solution:
Reduce the number of streams to the following:
If no alternate data paths are added, the number of streams must be equal
to the number of drives in the library associated with the primary copy.
If alternate data paths are added in the primary copy, the number of
streams must be equal to the number of drives in all the libraries
associated with all the data paths.
Backups to a storage policy copy with multiple data paths are in the
Waiting state
This might occur for either of the following reason:
Cause: The criteria for using an alternate data path may not be
selected.
Cause: All the resources associated with all the data paths may
not be available .
Solution: Verify the following resources and if possible enable the resources
associated with at least one data path.
MediaAgent Properties - verify the MediaAgents associated with the data
paths are online.
Library Properties - verify the libraries associated with the data paths
are online.
Drive Pool Properties - verify the drive pools associated with the
libraries in the data path are online.
Drive Properties - verify the drives associated with each of the drive
pools in the data path are online.
Also ensure that spare media is available in the scratch pools associated
with the data paths added in the storage policy copy.
Jobs Using the library go into Waiting
The Reason for the Job Delay in the Job Details dialog box may
display the message No Resource available.
Cause: The Device Streams assigned in the Storage
Policy Properties associated with the library is greater than the number of
drives available in the library.
Solution: Make sure that the Device Streams assigned
is equal to the number of drives in the library.
If you have added alternate data paths to the primary copy of the storage
policy, the number of streams must be equal to the sum of drives available in
all the libraries associated with all the data paths.
Backups on Unix MediaAgents fail with an Index Not Available error
Cause: The mount point to the index cache folder may not be mounted.
Note that mount points are not automatically mounted
when a Unix MediaAgent is rebooted.
Solution:
From the Catalog tab
of MediaAgent Properties, verify the location of the Index Cache Directory
for the MediaAgent.
Mount the folder containing the index cache using the same path specified
in Index Cache Directory.
Re-run the
backup.
Multi-streamed database backups always remain in the Waiting state
Cause:
You may have defined more number of streams than the actual number of drives
in the library associated with the default data path candidate.
Solution:
Kill the backup job.
Reduce the number of streams in the Storage Policy Properties dialog
box.
If necessary, reduce the number of streams in the Subclient Properties
(Storage Device) tab, associated with the backup.
The resources on the default data path candidate may not be available and
each of the alternate data paths do not have sufficient number of drives.
Solution:
Verify the following resources and enable the resources
associated with the default data path.
MediaAgent Properties - verify the MediaAgents associated with the
default data path is online.
Library Properties
- verify the libraries associated with the
default data path is online.
Drive Pool Properties - verify the drive pools associated with the
libraries in the default data path is online..
Drive Properties - verify the drives associated with each of the drive
pools in the default data path is online.
Also ensure that spare media is available in the scratch pools associated
with the default data path.
Add an alternate data path with sufficient number of physical drives to
support this backup.
Backups do not automatically use an alternate data path soon after the time
indicated in the Criteria for Alternate Data Path
This might occur for the following reasons:
Cause: The time indicated in the Criteria for Alternate Data Path, is
the minimum time that the system will wait before using an alternate data path.
The actual switch over will occur only when the backup job is processed by the
Job Manager and depends on the number of jobs in the Job Manager at that time.
Solution: The backup job will automatically complete, when the Job
Manager processes the job and the time indicated in the criteria for alternate
data path is reached.
Although common data paths are defined in primary and secondary copies,
another data path is being used for Auxiliary Copy operations
This might occur for the following reasons:
Cause: If alternate data paths are selected on secondary copies the
system will always strive to perform LAN-free Auxiliary Copies.
Consider
the diagram on the right. Using this configuration as an example, we can setup
the following data paths:
Storage_policy_1= Primary Copy
MediaAgent 1, Library 1, Drive Pool 1, Default scratch Pool (Default path)
MediaAgent 2, Library 2, Drive Pool 2, Default scratch Pool (alternate path)
Storage_policy_1= Secondary Copy
MediaAgent 3, Library 1, Drive Pool 3, Default scratch Pool (Default path)
MediaAgent 3, Library 2, Drive Pool 4, Default scratch Pool (alternate path)
MediaAgent 1, Disk Library 1
MediaAgent 2, Disk Library 2
Assume that a full and incremental backup was performed. The data associated
with the full backup resides in Library 1with media ID 0001. During the
incremental backup the alternate data path was used and hence the incremental
backup data resides in Library 2 with media ID 0002.
When an Auxiliary Copy operation is run on the secondary copy, MediaAgent 3
will be used to perform the operation. This is because MediaAgent 3 has access
to both the libraries, and thus can read from media used by both MediaAgent 1
and MediaAgent 2.
Solution: This setup may be advantageous as it uses no network
resources for the Auxiliary Copy operation. If however, you wish to remove this
setup, remove the alternate data paths from the Secondary Copy.
Access Denied to the Shared Index Cache Directory
This might occur for either of the following reasons:
Cause: Trust relationships between the MediaAgent's domains and the
domain in which the shared index cache resides may not be established.
Solution: Contact your Network Administrator to setup trust
relationships between the domains.
