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The Copy Threshold option is effective only when the load of the storage system is heavy. When
the Copy Threshold option is in effect, all the copy processing by the restore operation stops. For
information about the setting of the Copy Threshold option, call HP technical support.
Copy operations that are stopped by the Copy Threshold option will resume when the load of the
storage system becomes light. If this option is in effect, not only XP Snapshot copy operations, but
also the copy operations of the following program products, will stop when the load of the storage
system is heavy:
• XP Business Copy Software
• XP Business Copy for Mainframe
• HP StorageWorks XP for FlashCopy Mirroring Software (both Version 1 and 2)
• XP Auto LUN Software
Interoperability with Other Products and Functions
XP Snapshot can create pairs by sharing volumes with other program products, such as XP Business
Copy or XP Continuous Access. In addition, you can create XP Snapshot pairs by using volumes
to which attributes are assigned by the Data Retention Utility or RAID Manager. Table 5 (page 26)
shows whether or not XP Snapshot pairs can share volumes with other program products.
Table 5 Volume Sharing with Other Program Products
XP Snapshot Pair S-VOLXP Snapshot Pair P-VOLVolumes of Other Program Products
NoYes
1
XP Business Copy pair P-VOL
NoYes
2
XP Business Copy pair S-VOL
NoYesXP Continuous Access pair P-VOL
NoYesXP Continuous Access pair S-VOL
NoYesHP StorageWorks XP XP Continuous Access
Journal Software pair P-VOL
NoYesXP Continuous Access Journal pair S-VOL
NoYesAuto LUN source volume
2
NoNoAuto LUN target volume
2
YesYesRead Only volume
YesYesProtect volume
YesYesS-VOL Disable volume
YesYesZero Read Capacity volume
YesYesInvisible volume
Yes: The XP Snapshot volume can be shared.
No: The XP Snapshot volume cannot be shared.
1 An XP Business Copy pair and an XP Snapshot pair cannot have the same mirror unit (MU) number. For
example, if the MU number of the XP Business Copy pair is 0, you cannot create an XP Snapshot pair
whose MU number is 0 and whose P-VOL is also used as an XP Business Copy P-VOL. Also, if the MU
number of the XP Snapshot pair is 1, you cannot create an XP Business Copy pair whose MU number is 1
and whose P-VOL is also used as an XP Snapshot P-VOL.
2
For information on using XP Auto LUN Software, contact HP technical support (see “Contacting HP”
(page 116)).
When XP Snapshot shares volumes with the other program products, some operations are restricted according
to the pair statuses. For detailed information, see the following sections.
26 About XP Snapshot Operations