Hitachi TAGMASTORE MK-90RD011-25 - Manual (Page 30)

12 Chapter 2 Overview of CCI Operations
2.2.2.1 Restrictions for ShadowImage Cascading Volumes
Pair Creation. Pair creation of SVOL (oradb1) can only be performed after the pair creation
of S/PVOL (oradb). If pair creation of SVOL (oradb1) is performed at the SMPL or PSUS state
of S/PVOL (oradb), paircreate will be rejected with EX_CMDRJE or EX_CMDIOE.
PVOL S/P
VOL
SVOL
SVOL
oradb oradb1
oradb2
1
2
0 0
Pair Splitting. Pair splitting of SVOL (oradb1) can only be performed after the SMPL or PSUS
state condition of S/PVOL (oradb), due to ShadowImage asynchronous copy. If the pair
splitting of SVOL (oradb1) is performed at the COPY or PAIR state of S/PVOL (oradb), the
pairsplit command will be rejected with EX_CMDRJE or EX_CMDIOE.
PVOL S/P
VOL
SVOL
SVOL
oradb oradb1
oradb2
1
2
0 0
Pair Restore. Pair restore (resync from SVOL (oradb1) to S/PVOL) can only be performed
when the state condition of SVOL (oradb) and another PVOL (oradb2) on the S/PVOL are
SMPL. If the pair restore of SVOL (oradb1) is performed at the COPY or PAIR or PSUS state of
S/PVOL (oradb or oradb2), the pairresync (-restore option) command will be rejected with
EX_CMDRJE or EX_CMDIOE.
PVOL S/P
VOL
SVOL
SVOL
oradb oradb1
oradb2
1
2
0 0