It shows the current status of the pool. Based on the status, it shows the following types of indicators:
ONLINE icon- indicates the pool is online, healthy and operating normally. DEGRADED icon -indicates the pool is in a degraded state, continues to process data normally, but is at increased risk and requires attention; e.g., replace a failed disk in a RAID array. UNAVAIL or FAILED icon indicates the pool is in a failed state and is not currently processing storage requests. This usually means there are disk failures exceeding RAID protection.