HP StorageWorks XP Continuous Access User Guide: HP XP12000 Disk Array, HP XP10000 Disk Array, HP 200 Storage Virtualization System (T1711-96025, May 2011)

NOTE: HP recommends XP Business Copy (BC) for intra-disk array copy operations. If BC is not
installed, you can use XP Continuous Access to copy within the same local disk array. This
configuration requires at least one fibre cable loop.
• For shared XP Continuous Access/XP Business Copy volumes, the XP Continuous Access pair
status is reported to the host if you query the XP Continuous Access P-VOL or S-VOL. To obtain
the BC pair status, query the P-VOL of the BC pair.
• BC supports multiple S-VOLs for each P-VOL. If you issue a pair status query to a BC P-VOL
(for example, pairdisplay), the status for only one BC pair is reported (pair with the S-VOL
with lowest LDEV ID). To obtain the pair status for BC pairs with other S-VOLs, direct the host
query to the specific S-VOL using the S-VOL's LDEV ID in the host command. The BC remote
console software displays the LDEV ID and BC pair status of all S-VOLs associated with a
P-VOL.
Table 13 Host pair status reporting for XP Continuous Access/XP Business Copy shared volumes
Pair status reported by disk arrayNumber of BC S-VOLsNumber of XP Continuous
Access pairs
Simplex00
BC pair status10
BC pair status for pair whose S-VOL has lowest LDEV
ID
2 or more0
XP Continuous Access pair status01
XP Continuous Access pair status11
XP Continuous Access pair status2 or more1
Table 14 Data currency of a shared XP Continuous Access/XP Business Copy volume
BC pair statusXP Continuous
Access pair
status
PSUECOPY
(RS/RS-R)
PSUSCOPY (SP)PAIRCOPY (PD)
Not currentNot currentCURRENTNot currentNot currentNot currentCOPY
Not currentNot currentCURRENTNot currentNot currentNot currentPAIR
Not currentCURRENTCURRENTCURRENTCURRENTNot currentPSUS/PSUE
Figure 14 (page 44) through Figure 17 (page 45) show various XP Continuous Access/XP Business
Copy configurations that share volumes. XP Continuous Access supports synchronous and
asynchronous operations for shared XP Continuous Access/BC volumes.
• Figure 14 (page 44) shows an example of an XP Continuous Access P-VOL that also functions
as a BC P-VOL. With this configuration, use BC for on-site data backup if an XP Continuous
Access failure occurs, and use XP Continuous Access to provide remote backup of the BC
P-VOL if a BC failure occurs.
Combining XP Continuous Access with other data management operations 43