HP XP Business Copy Software - Manual (Page 36)

L2 Pair Status L1 Pair
Status
PSUE COPY(RS) PSUS(SP)/
PSUS COPY(SP) PAIR COPY(PD)
Read Only Read Only Read Only Read Only Read Only Read Only PAIR
Read Only Read Only Read Only Read Only Read Only Read Only COPY(SP)
Read/ Write Read/ Write Read/ Write Read/ Write Read/ Write Read/ Write
PSUS(SP)/
PSUS
Read Only Read Only Read Only Read Only Read Only Read Only COPY(RS)
Read Only Read Only Read Only Read Only Read Only Read Only COPY(RS-R)
Read Only Read Only Read Only Read Only Read Only Read Only PSUE
Table 11 indicates the relationship between the read/write operation from the host to the leaf volume
and the L2 pair status.
Table 11 Read/write operation (host to the leaf volume) and L2 pair status
L2 Pair Status COPY
PSUE COPY(RS) PSUS(SP)/PSUS COPY(SP) PAIR
Read Only Read Only Read/Write Read Only Read Only Read Only
At-Time Split function
In the past, a BC pair group split each LUN pair in the group at a slightly different time. If the
application data spanned multiple LUNs in the group, there was the chance of data corruption unless
the application was stopped before the split. With the At-Time Split function, LUN pairs are split at
the same time within the group, which keeps data consistent without having to stop the application.
At this time, the At-Time Split operation is performed using RAID Manager on the UNIX/PC server
host. You can use Command View XP or XP Remote Web Console to perform BC pair operations for
At-Time Split pairs created by RAID Manager. However, the At-Time Split option in Command View
XP or XP Remote Web Console is disabled.
A BC consistency group (CTG) is a user-defined set of BC volume pairs used for the At-Time Split
function. This function creates S-VOLs of all P-VOLs in the same consistency group when the pairsplit
command is executed.
BC consistency groups and the At-Time Split function have the following restrictions:
• You can configure up to 128 consistency groups in a disk array, including BC consistency groups.
• A number (0–127) is assigned to each consistency group. You can specify a consistency group
number when you create BC pairs. If you do not specify a number, the disk array assigns a number
automatically.
• You can define up to 4,096 BC pairs in a consistency group. However, for LUSE volumes containing
n LDEVs, you should count as n volumes. For more information about LUSE volumes, see the HP
StorageWorks LUN Configuration and Security Manager XP user guide for the XP12000/XP10000.
• BC pairs and ShadowImage pairs cannot co-exist in the same consistency group.
• To configure BC consistency groups, use the RAID Manager software. However, to confirm the
BC consistency group numbers, use BC (see
Volume list ).
Business Copy XP (BC) for the Array 36