HP XP Business Copy Software - Manual (Page 16)

16 Business Copy XP (BC) for the XP128/XP1024
BC operations
Set reserve attribute operation
This operation reserves a volume so it can be used as a BC S-VOL. Reserved volumes can only be used as
BC S-VOLs. The disk array rejects all write operations to reserved volumes (unless in split (PSUS) status).
You can reserve up to 4,095 volumes in one disk array. Use the Set Reserve Attribute window (see ” Setting
reserve attributes ” on page 43) to reserve volumes for use as BC S-VOLs.
A volume might be reserved for BC to ensure that a server does not mount it before BC can use it in a pair.
BC cannot use a volume as an S-VOL if it is being used by a server.
NOTE: BC leaf volumes (L2 cascade pair) also function as S-VOLs and must be reserved prior to being
assigned to an L2 cascade pair.
Reset reserve attribute operation
This operation unreserves a volume so it can be mounted and accessed by all hosts. After you reset the
reserve attribute, the disk array accepts all subsequent I/O operations to the volume. Use the Reset Reserve
Attribute window (see ” Resetting reserve attributes ” on page 44) to unreserve volumes.
Paircreate operation
This operation establishes the new BC pairs. The volume that will be the P-VOL must be in the SMPL
(simplex) state, and the volume that will be the S-VOL must be in the SMPL state before being added to a
BC pair.
NOTE: You can reserve the S-VOL before creating a pair, but you can also create a pair with an
unreserved S-VOL. Use the Paircreate window (see ” Creating BC pairs (Paircreate) ” on page 45) to create
new BC volume pairs.
11 OPEN-V 9.6 GB or less 1 2,047 4,095
12 9.7 GB – 19.1 GB 2 1,024 2,048
13 19.2 GB – 28.8 GB 3 682 1,365
14 28.9 GB – 38.5 GB 4 512 1,024
15 38.6 GB– 48.1 GB 5 409 819
16 48.2 GB– 57.8 GB 6 341 682
17 57.9 GB or more 7 292 585
Table 4 Number of pairs that can be created with volumes of each emulation type and capacity
Volume No. of
differential
tables per
pair needed
for controlling
the difference
between the
primary and
secondary volumes
No. of pairs
that can be
created
(If the volumes
of the same emulation
type and capacity are
used to create all
the pairs)
No. Emulation
Type
Capacity CUs is 4
or less
CUs is 5
or more