Storing data written to
DP-VOLs
Data written by hosts to DP-VOLs is stored in pool volumes on a page basis. If pool volumes are created from the parity group used by FMC drives, data is compressed and stored to drives. The compression ratio of data varies for each data update or data deletion operation. Therefore, the capacity of data that can be stored fully is the capacity of the physical area of the FMC used to create the parity group. For a pool containing pool volumes with accelerated compression enabled, the smaller of the following two capacities is the FMC capacity that corresponds to the pool capacity reserved for writing:
- The total capacity of the pool volumes
- The FMC capacity of the parity group to which the pool volumes belong
If pool volumes carved from the FMC parity group and pool volumes carved from other parity groups are intermixed, the total capacity that corresponds to the pool capacity reserved for writing is calculated by the following formula:
Total capacity that corresponds to the pool capacity reserved for writing = FMC capacity of the parity group to which the pool volumes belong + Total capacity of pool volumes carved from other parity groups.
The purchased license of Dynamic Provisioning is consumed with respect to the defined pool capacity. However, if you are using a pool comprised of pool volumes assigned by accelerated compression-enabled parity groups, the purchased license of Dynamic Provisioning is used with respect to the pool capacity reserved for writing.
