Protect V-VOLs when I/O fails to Blocked Pool VOL protects the V-VOL from read and write requests if the pool-VOL is blocked.
Protect V-VOLs when I/O fails to Full Pool protects the V-VOL from read and write requests if the pool is full.
Data Retention Utility enables you to suppress data from being read or written to a V-VOL when a Dynamic Provisioning pool is full. Contact customer support for the suppression instructions. When configured according to the suppression method, the Protect attribute is automatically assigned to the V-VOL when the pool is full. The Protect attribute is also assigned to a V-VOL that is used with other software.
The requirements for using the V-VOL protection function are:
- Data Retention Utility (DRU) must be installed.
- The pool type must be Dynamic Provisioning.
The behavior of the V-VOL protection function depends on the settings of system option modes (SOMs) 729 and 803, as specified in the following tables.
| SOM 729 | Protect V-VOLs when I/O fails to Full Pool | Behavior |
|---|---|---|
| OFF | Disabled | DRU protect attribute is not set |
| OFF | Enabled | DRU protect attribute is set |
| ON | Disabled | DRU protect attribute is not set |
| ON | Enabled | DRU protect attribute is set |
| SOM 803 |
Protect V-VOLs when I/O fails to Blocked Pool VOL |
Behavior |
|---|---|---|
| OFF | Disabled | DRU protect attribute is not set |
| OFF | Enabled | DRU protect attribute is set |
| ON | Disabled | DRU protect attribute is not set |
| ON | Enabled | DRU protect attribute is set |
The V-VOL protection function setting has no connection to the access attribute status of V-VOL. For example, even if you disabled the V-VOL protection function to the pool while the protect attribute was being enabled on the V-VOL, the protect attribute would still be enabled on the V-VOL. To change the access attribute to the attribute that is not Protect, use the raidvchkset command.
If you remove Data Retention Utility, the V-VOL protection function settings remain set in the pool but are no longer active. In this case, if you reinstall Data Retention Utility, the protection function settings made before Data Retention Utility was removed are reactivated in the pool.
If you use the V-VOL protection function, you cannot simultaneously use the following host mode options. You cannot use the V-VOL protection function for V-VOLs associated with the host group for which one or both host mode options are enabled:
- Host mode option 63 ((VAAI Support Option for vStorage APIs based on T10 standards)
- Host mode option 73 (Support Option for Windows Server 2012)