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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 nearing 100% |
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. When such a warning 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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