When working with SSDs, monitor how actively you use them and calculate their estimated lifetime.

Typically, storage vendors provide reliable lifetime estimates for an SSD under ideal conditions. For example, a vendor might guarantee a lifetime of 5 years under the condition of 20GB writes per day. However, the more realistic life expectancy of the SSD will depend on how many writes per day your host actually generates. Follow these steps to calculate the lifetime of the SSD.

1

Obtain the number of writes on the SSD by running the esxcli storage core device stats get -d=device_ID command.

The Write Operations item in the output shows the number. You can average this number over a period of time.

2

Estimate lifetime of your SSD by using the following formula:

vendor provided number of writes per day times vendor provided life span divided by actual average number of writes per day

For example, if your vendor guarantees a lifetime of 5 years under the condition of 20GB writes per day, and the actual number of writes per day is 30GB, the life span of your SSD will be approximately 3.3 years.