Troubleshooting and Impacts on the DSS Usage

Case one
If server or disk failures cause a disk being removed from the storage pool, the total available capacity becomes smaller. After the fault is rectified, the total available capacity can be restored to the original value.
Case two
If a server or disk is faulty, and no disk is removed from the storage pool, the storage pool is degraded, which does not affect the use of the storage pool. After the fault is rectified, the storage pool becomes normal.

Storage pool degradation refers to that the number of data copies for some data in a storage pool is reduced from three copies to two copies and cannot be automatically restored without manual troubleshooting.
Case three
If a server or disk is faulty, your services may be interrupted. For example, if the used capacity is 98% and a disk is removed due to server or disk failures, the total available capacity decreases. As a result, the proportion of the used capacity to the total available capacity reaches nearly 100%. The write protection is enabled for the storage pool, and your services are interrupted.