HP StorageWorks XP Remote Web Console Software - Manual (Page 84)

84 ShadowImage for the XP128/XP1024/XP10000/XP12000
Table 33 describes ShadowImage - FlashCopy pair status condition.
Establishing ShadowImage - FlashCopy Pairs
You can establish an ShadowImage - FlashCopy pair for an SI390 simplex volume. Table 34 shows the
allowable ShadowImage - FlashCopy operations for each pair status. You can also add an ShadowImage
- FlashCopy pair for SI390 S-VOL or T-VOL in the split or duplex status (see Table 35 and Table 36 ).
However, you cannot establish a ShadowImage - FlashCopy pair if the S-VOL already has three T-VOLs.
ShadowImage - FlashCopy adds a second layer of ShadowImage - FlashCopy pairs onto the first layer of
original SI390 pairs. These two layers of pairs (L1 and L2) can create up to six copies of one original
SI390 source volume (S-VOL).
NOTE: You cannot add an ShadowImage - FlashCopy L2 pair onto an ShadowImage - FlashCopy L1
pair, an SI390 L2 pair onto an SI390 L1 pair, or any third layer of pair (L3 pair) onto an L2 pair.
Table 33 ShadowImage - FlashCopy pair status condition
Status Description Host Status S-VOL Access T-VOL Access
F-Copy ShadowImage - FlashCopy is
requested with host commands. The
S-VOL differential data is copied to the
T-VOL in the background. When the
NOCOPY option is specified, no
background copy is performed.
S-VOL = SIMPLEX
T-VOL = SIMPLEX Read/write. Read/write, can
be varied online.
Table 34 Pair Status versus allowable operations
Operation Pair Status
SI390
SI -
FC
Simpl. Pend. Dupl. SP-
Pend
V-
Spl.
Spl. Resync Resync-
R
Susp. F-
Copy
Split Pair OK OK OK x x x x x x x
Suspend Pair x OK OK OK OK OK OK x OK x
Resync Pair x x x x OK OK x x OK x
Reverse Copy x x x x x OK x x x x
Quick Restore x x x x x OK x x x x
Delete Pair x OK OK OK x OK OK OK OK OK
Establish
Relationship
OK x x x x x x x x x
Withdraw
Relationship
x x x x x x x x x OK