Hi ,
Pls check the doc it will give some idea.
you closed thethread .its solved or not.sorry I m not able to attachethe doc.
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Cascade function
This function creates a second layer of volume pairs underneath the first layer of BC pairs. Pairs created
in the first and second layer are called cascaded pairs. Figure 12 illustrates cascaded BC volume pairs.
The first cascade layer (L1) is the original BC pair, consisting of one P-VOL (root volume) and up to three
S-VOLs (node volumes). In the second cascade layer (L2), the S-VOLs of the original BC pair function as
the P-VOLs of the L2 pairs, and each L2 P-VOL can have up to two S-VOLs (leaf volumes). This layering
scheme can create up to nine copies of one BC primary volume (P-VOL).
Every volume can have up to three Mirror Unit (MU) numbers associated with it. The MU number
designates a pair for which the volume is a member. The MU number is not the number of the pair, but
the number of the volume. A pair is made up of two volumes of which each pair member could have the
same or different MU numbers.
â ¢ MU=0 is the number of a volume for its first pair.
â ¢ MU=1 is the number of the same volume for its next pair.
â ¢ MU=2 is the number of the same volume for its third pair.
â ¢ The MU number of an S-VOL is always MU=0.
34 Business Copy XP (BC) for the Array
For Level 1 (L1) pairs, the root volume could have MU=0, MU=1, and MU=2. For L1 pairs, the associated
S-VOLs all have MU=0 because this is the first pair of which they are a member.
For the Level 2 (L2) pairs, the L1 S-VOLs are now all acting as L2 P-VOLs. Because they are already a
member of one pair, the next MU number for each of them is MU=1 for their first L2 pair and MU=2 for
their second L2 pair. For the S-VOLs associated with each of these pairs, the MU number is once again
MU=0 because this is the first pair of which they are a member.
Reagrds
atul
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