Hewlett Packard Enterprise HPE XP7, User Manual, Page: 54 / 311

• When the capacity saving function is used, management information is stored in a pool. As a result,
there may be difference between a P-VOL and an S-VOL in the number of used pages or licensed
capacity.
• The capacity saving function can be set on the P-VOL or S-VOL of a cascaded or clone pair, but only
works on the clone pair. The deduplication system data volume cannot be used as a Fast Snap P-VOL
or S-VOL.
• You can create a Fast Snap pair whose P-VOL or S-VOL is a Thin Provisioning V-VOL only if you are
not currently expanding the Thin Provisioning V-VOL capacity.
• Performing a Fast Snap paircreate operation while zero pages are being reclaimed (including
reclamation by WriteSame, Unmap command, or rebalancing) results in the zero-page operation being
interrupted.
• When the WriteSame or Unmap command is issued to the P-VOL or the S-VOL for a Fast Snap pair,
zero pages are not reclaimed by the command.
• Fast Snap pair creation might be rejected if the Unmap command operation is in progress with system
option mode 905 ON. Wait a while and then retry the operation. If the operation still fails, set system
option mode 905 to OFF and try again.
• You can use a maximum size Thin Provisioning volume as a Fast Snap P-VOL or S-VOL. For
information about the maximum size for Thin Provisioning volumes, see the HPE XP7 Provisioning for
Open Systems User Guide .
More information
Creating V-VOLs for Fast Snap S-VOLs on page 100
Creating Fast Snap pairs using Remote Web Console on page 114
Sharing Fast Snap volumes with Resource Partition
For more information about resource groups, see the HPE XP7 Provisioning for Open Systems User
Guide .
Acronyms and abbreviations for XP7 Storage system
software applications used in this guide
• FC MF: Compatible FlashCopy
• FCSE: Compatible FlashCopy
• HA: High Availability
• BC: Business Copy
• BC MF: Business Copy MF
• Cnt Ac-S: Continuous Access Synchronous
• Cnt Ac-S MF: Continuous Access Synchronous MF
• FS: Fast Snap
• Cnt Ac-J: Continuous Access Journal
• Cnt Ac-J MF: Continuous Access Journal MF
54 Sharing Fast Snap volumes with Resource Partition