Brocade Communications Systems Network Advisor 12.0.0, User Manual

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690 Brocade Network Advisor SAN User Manual
53-1002696-01
Thin provision LUNs
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Current LBA: The Logical Block Address (LBA) of the block that is currently being written.
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Number of Blocks: The number of blocks written.
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Thin Provision LUN: Identifies if the new LUN is a thin provisioned LUN. Options are:
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Yes: Thin provision support is limited to Brocade-tested storage arrays. The thin
provision LUN status will be displayed as Yes for supported storage arrays only.
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No: Shown as No if the LUN is not a thin provision LUN.
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Unknown: Shown if the LUN status cannot be determined.
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Not Applicable: Applies to Fabric OS encryption switches that are running a Fabric OS
version earlier than v7.1.0.
3. Click Refresh periodically to update the display.
Thin provision LUNs
With the introduction of Fabric OS 7.1.0, the Fabric OS encryption switch can discover if a disk LUN
is a thin provision LUN. Support for a thin provision LUN is limited to disk containers only. Thin
provision LUNs can be created with the new LUN option.
NOTE
Currently, thin provision LUN support is limited to Brocade-tested storage arrays. The thin provision
LUN status will be displayed as Yes for supported storage arrays only.
Thin provision LUNs rely on on-demand allocation of blocks of data, instead of the traditional
method of allocating all blocks up front. If a thin provision LUN status is shown as Yes, then
first-time encryption and rekey are done on the allocated blocks only, which results in the
provisioned region of the LUN to remain the same after the rekey is performed.
Thin provision LUN support requires no action by the user. The Fabric OS encryption switch can
automatically detect if a LUN is a thin provision LUN.
NOTE:
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If a LUN is a thin provision LUN, LUN status is shown as Yes. (Thin provision support is limited
to Brocade-tested storage arrays. The thin provision LUN status will be displayed as Yes for
supported storage arrays only.)
•
If a LUN is not a thin provision LUN or if thin provisioning is not supported with the LUN, LUN
status is shown as No. (This can be a result of the array not supporting thin provisioning, or the
Fabric OS encryption switch/blade does not support the thin provisioning features of the array.
Refer to the Fabric OS release notes for supported arrays.)
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If LUN status cannot be determined, LUN status is shown as Unknown.
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If you are running a Fabric OS version earlier than v7.1.0, LUN status is shown as Not
Applicable.