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We call an oversubscription situation when:
| 1. | The storage pool is configured for thin provisioning (“thin storage pool”) |
| 2. | The storage pool is oversubscribed, i.e. the total disk space visible to the hosts (subscribers) is greater than its actual capacity (this situation is normal for a thin pool since it is its very purpose) |
| 3. | The storage pool actual consumed capacity is higher than 75% |
Such situation is highly critical because the inability to allocate additional space to a LUN when requested by the subscriber host will lead to catastrophic data loss and corruption.
The OversubscriptionSituation parameter will alert you to an oversubscription situation by triggering an alarm. When such an alarm is issued by the KM, it is highly recommended that the SAN administrators add capacity to the storage pool as soon as possible.
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