Disk vendors rate SSD endurance by how many writes can occur over the lifetime of an SSD. As lower-cost SSDs that support fewer drive writes per day become available, the cost/benefit analysis regarding which SSDs to use is highly dependent on your applications and I/O workload, together with the ratio of SSDs to conventional disks.
Since the storage system tiering algorithm automatically moves "hot" data to SSDs and less-used "cool" data to conventional disks, applications and environments that require mission-critical movement of frequently accessed “hot” data might dictate a higher ratio of SSDs to conventional disks.
Because data is characterized every five seconds and moved to the appropriate storage device, no fixed rule is used to determine which SSDs are used. For this reason, using SSDs with the same DWPD values is advised.
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