Data backup and recovery differences between ShadowImage and Thin Image Advanced

P-VOL physical failures such as data drives

P-VOL data can be recovered using the S-VOL.

P-VOL data cannot be guaranteed.

P-VOL logical failures such as data update errors or malware infections

P-VOL data can be recovered using the S-VOL.

P-VOL data can be recovered using the S-VOL.

Capacity required for backup

More capacity is required for backup because all data in the P-VOL is retained.

Less capacity is required for backups because only the differential data of the P-VOL (VSP One B20 series and VSP One B85) and the control information (VSP One B85 only) is retained.

Less capacity is required for backups because only the differential data of the P-VOL is retained.

For snapshot pairs: When a cloned pair is created, all data in the P-VOL is retained and more capacity is required for backup.

Impact on P-VOL performance when accessing backed up data

P-VOL performance is not affected because the P-VOL and the S-VOL can be disconnected.

P-VOL performance is affected because data in the P-VOL is shared.

For snapshot pairs. When a cloned pair is created, the P-VOL and the S-VOL can be separated and the P-VOL performance is not affected.

S-VOL or pool physical failures

If a physical failure occurs in an S-VOL or pool, data in the S-VOL cannot be guaranteed.

If a physical failure occurs in a pool*, data in all S-VOLs that use the pool cannot be guaranteed.

* When a pool is full (the depletion threshold is exceeded in a pool for which the capacity for TIA pairs is limited), data in all S-VOLs using the pool cannot be guaranteed.