HP XP Racks - Manual (Page 64)

Requirements Items
The LDEV format operation can be performed on pool-VOLs if one of these conditions is satisfied: LDEV format
• The THP V-VOL defined for the pool does not exist.
•
All THP V-VOLs defined for the pool are blocked.
You cannot specify a volume with a path definition as a pool-VOL. Path definition
THP V-VOL requirements
Requirements Items
THP V-VOL (V-VOL) Volume type
The LDEV number is handled in the same way as for normal volumes.
OPEN-V Emulation type
Up to 63,232 per system. Any number of available THP-VOLs can be associated with a pool. Maximum number of
THP V-VOLs
Up to 63,232 volume groups per system. If external volumes and V-VOLs are used, the total
number of external volumes and V-VOLs must be 63,232 or less.
Volume capacity from 46.87 MB to 59.9 TB per volume. Volume capacity
• TB: 0.01 to 59.99
•
GB: 0.04 to 61,439.99
•
MB: 46.87 to 62,914,556.25
• Blocks: 96,000 to 128,849,011,200
However, if you use the volume as a P-VOL or S-VOL of Business Copy, Auto LUN, Continuous
Access Synchronous, or Continuous Access Journal, the volume capacity must be 4 TB or less.
Total maximum volume capacity of 12.3 PB per storage system.
Available. Path definition
Available (Quick Format is not available.) LDEV format
System Option Mode 867 OFF
When you perform the format operation on a THP V-VOL, the storage system releases the
allocated page area in the THP V-VOL. The used capacity of the pool is then decreased in size
equivalent to that of the formatted THP V-VOL capacity.
NOTE: System Option Mode 867 ON: When you format an LDEV on a THP V-VOL, the capacity
mapped to the THP V-VOL is released to the pool as free space.
Requirements for increasing THP V-VOL capacity
You can increase THP V-VOL capacity up to 59.9 TB. To notify the host that the THP V-VOL capacity
has been increased, make sure host mode option 40 is enabled. Processing differs as follows,
depending on the value of host mode option 40:
•
When host mode option 40 is not enabled, the host will not be notified that the THP V-VOL
capacity has been increased. Therefore, the THP V-VOL data has to be read again by the
host after the capacity is increased.
•
When host mode option 40 is enabled, the host is notified that the THP V-VOL capacity has
increased. If the operating system cannot recognize the value of capacity that was increased,
the THP V-VOL data has to be read again by your storage system.
64 Configuring thin provisioning