Hp XP RAID Manager Software Instrukcja Użytkownika Pobierz pdf (Strona 7)

to data in the data pool and P-VOL actually reside in cache memory. Because of this, part of your

system’s cache is reserved for Snapshot when it is enabled.

Figure 1 How V-VOL maintains point-in-time data when pair is split (1)

Figure 2 How V-VOL maintains point-in-time data when pair is split (2)

Figure 3 How V-VOL maintains point-in-time data when pair is split (3)

Data pools

The data pool holds data from the P-VOL that is being replaced.

After a pair is split, the V-VOL maintains pointers to point-in-time data. If updates are written to the

P-VOL, before the block is updated, the data that is being replaced is first copied to the data pool.

The V-VOL pointer to this block is updated to the new address in the data pool.

A data pool is used by all pairs sharing the same P-VOL.

How Snapshot works 7

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Hp XP RAID Manager Software Instrukcja Użytkownika Strona 7