 Attributes
Automatically add datapaths for new drivepools configured
When enabled, the system automatically adds the alternate data paths
for a shared library. It is also essential to enable the following option
in the storage policy copy properties for this option to work: Automatically
add new datapath option in the Copy Properties (Data Paths)
tab.
This option can be used when several MediaAgents share a library. This
will help you to automatically create alternate data paths in the associated
storage policy during the library configuration.
When a library’s firmware is upgraded or when a hardware is replaced,
sometimes it would start reading the barcodes of the media in the library
differently by appending, pre-pending or truncating some characters in the
barcode. When this option is enabled the system automatically updates the
media barcodes in the library - both media inside the library and exported
media. By default this option is enabled in the library.
Note the following assumptions:
- The length of the barcode for all media inside the library is the
same.
- When the firmware is changed, the new string which is appended,
pre-pended or truncated is the same for all the media. For example:
Old Barcodes
000012
000013
New Barcodes
000012L1
000013L1
- There will be a difference in the length of the old barcodes and
new barcodes.
If this option is disabled, and the barcodes are changed after a firmware
upgrade all existing media, including media with data and spare media will be
marked as exported and a new set of media (with new barcodes) will be listed
inside the library. In this situation, you must update the barcodes as
described in Manually
Updating Media Barcodes after a Firmware Upgrade.
This option indicates whether the MediaAgent will reposition the tape
and retry the read operation (i.e., data recovery operation, auxiliary
copy operation, synthetic full job, etc) on SCSI errors, to prevent the
failure of the job. You can also indicate how many times and how often the
retry must be attempted.
By default the Retry read operations on SCSI errors option is
enabled and the system tries to retry 5 times every 5 minutes.
Submit full scan on library when finding an empty barcode during drive
unmount
Indicates whether a full scan of the library will be performed when an
empty barcode is found while unmounting the drive. This is a troubleshooting
option which can be enabled in a library if you constantly find that the
system indicates that the media is exported when requested by a job, but
physically found in the library. For the specific job to succeed, you must
perform a full scan of the library. But if you find the problem occurring
frequently you can enable this option. By default this option is not enabled.
Configuration Parameters
The following parameters can be established under certain conditions
based on the library. Note that changes to any of these parameters will
take effect only when the library is Reset.
Prevent physical inventory of the library
This option provides the facility to disable the full scan operation
initiated by the MediaAgent when there is a unit attention. (i.e.,
when the door is accessed, the mail slot is accessed, the library controller
is reset, etc.)
In some older libraries, the firmware itself automatically initiates
an inventory when there is a unit attention. If you notice that there is
a double scan of the library after a unit attention, you can enable this
option.
By default, the Prevent physical inventory of the library option
is disabled.
Do Periodic mail slot check for any change in status
When this option is enabled, the MediaAgent will poll the library to
see if there is any change in the status of the mail slot. Enable this option
in libraries that do not automatically generate unit attention when there
is a change in the mail slot. For example, when media is imported or exported
and the mail slot is accessed to add or remove the media, the system will
never know the status of the operation, unless this option is enabled. You
can also specify how often the library must be polled by setting the
Library Status Check Interval.
By default, the Do Periodic mail slot check for any change in status
option is disabled.
Prevent Auto Import of Media from mail slot
When this option is enabled, media will not be automatically moved from
the mail slot into the library. Instead the media will be moved only when
an import operation is initiated from the CommCell Console.
We recommend that you enable both the Prevent Auto Import of Media
from mail slot and Do Periodic mail slot check for any change in
status options if you have a library which is partitioned into two or
more logical partitions and the mail slot is shared by these logical libraries.
This will ensure that the media is imported (or exported) to the appropriate
library.
This option is also useful to control the import media operation using
only the CommCell Console.
By default, the Prevent Auto Import of Media from mail slot option
is disabled.
When this option is enabled, the library handler will issue a SCSI command
during startup to unlock the library mail slot. By default this option is
not enabled.
This option is useful when other software may lock the library mail slot
and you would like the mail slot to be opened.
Library Status Check Interval
This option indicates how often the MediaAgent must poll the library
to see if there is a change in the status of the library such as a change
in the status of the mail slot, library door, library connectivity to the
Media Agent, etc.
If the Do Periodic mail slot check for any change in status option
is enabled, this interval also indicates how often the MediaAgent polls
the library to see if there is a change in the status in the mail slot.
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