Ref.: Dell Compellent SC 6.4_Admin Guide
Is Dell Compellent as Good as Dell claims it to be...!!
1# Data Progression’s auto tiering is not done in real time so if a workload profile changes, migration to new tiers may take some time i.e. once per day in “Off Peak Hours“. As described on Pg. 225 (Dell Compellent SC 6.4 Admin Guide) Section “How Data Progression Works”
The tiering policy is 4 days up 12 days down. For example, data that has been accessed within the last four progression cycles is stored on the highest tier, composed of the fastest disks. Data that has not been accessed for the last 12 progression cycles is gradually migrated down to the lowest tier, composed of
Slower, cheaper, larger disks as described on page Pg. 419 (Dell Compellent SC 6.4 Admin Guide)section Tier.
2# The impression that Dell gives to its potential...