Hp XP7 Storage Manuel d'utilisateur télécharger pdf (Page 10)

If there is a request for a write operation to an S-VOL in which the requested data is not yet copied

to the target, or a request for a read/write operation to a T-VOL in which the requested data is

not yet copied, the old data is copied from the S-VOL to the T-VOL first, and then the read/write

operation is performed. This process is called on-demand copying. The following figures show the

process of on-demand copying.

Figure 3 On-demand copy (case 1: write request to an area in the S-VOL from which the data has

not been copied)

Figure 4 On-demand copy (case 2: Read request to an area in the T-VOL to which the data has not

been copied)

10 About Compatible FlashCopy

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Hp XP7 Storage Manuel d'utilisateur Page 10