Space Reclamation - Brocade Communications Systems StoreFabric SN6500B Administrator's Manual

3
Thin provisioned LUNs

Space reclamation

When a block that was provisioned is no longer needed, it can be reclaimed. The Brocade
Encryption Switch supports following methods to reclaim the provisioned blocks:
•
•
Note the following limitations:
•
•
•
•
•
194
LUN serial number:
TP LUN:
LUN connectivity state: Connected
Key ID state:
FabricAdmin:switch> cryptocfg --show -rekey –all
LUN number:
LUN serial number:
TP LUN:Yes
Rekey session number:
Percentage complete:
Rekey state:
Rekey role:
Block size:
Number of blocks:
Current LBA:
FabricAdmin:switch> cryptocfg –-show –LUN tpdisk 0 10:00:00:00:c9:29:0f:01 –
stat
LUN number:
LUN type:
LUN serial number:
TP LUN:Yes
Encryption mode:
Encryption format:
Encrypt existing data:
Rekey:
Internal EE LUN state:
Encryption algorithm:
Key ID state:
New LUN:
Key ID:
Key creation time:
Sending the UNMAP SCSI command
Sending WRITE_SAME SCSI command with only UNMAP bit set.
Space reclamation is not allowed during rekey.
The Host will get garbled data while trying to read an unmapped region.
Because windows host utility "sdelete –c" sends WRITE command with zeros to unmap LBAs,
and which is currently not supported on the Brocade Encryption Switch, this utility will not be
able to unmap LBAs.
Rekey temporarily uses the last 512 blocks. As a result, these blocks will be marked as
provisioned by the thin provisioned LUN.
The first 16 blocks of the LUN will be mapped automatically (if it was unmapped), after the LUN
has been configured as an encrypted LUN.
50002AC000BC0A50
Yes
Key ID not Applicable
0x0
50002AC002E70A50
0
98
Read Phase
Primary/Active
512
4194304
4141617
0x0
disk
50002AC002E70A50
encrypt
native
disabled
disabled
Encryption enabled
AES256-XTS
Read write
No
d3:a6:de:b9:67:26:04:fa:b9:83:e1:c7:cf:ae:f1:9c
Fri Feb 17 03:41:54 2012
Fabric OS Encryption Administrator's Guide (SKM/ESKM)
53-1002721-01