Re: Ai... Sick of their promises
Like anything in IT, an incorrectly sized compellent by a partner or Dell rep can be a big problem. But this is not the fault of the Compellent. You are correct, currently data progression runs once a day but that is the big change in 6.3.10 or 6.4. Data progression will now be able to run a mini subset of itself multiple times through out the day, basically every time you take a replay it will check against your tier1 and decide if any pages should be moved down to tier2 in order to free up RAID10 tier1 space. Compellent or any other vendor can not help you if you have more data than space on the SAN. Properly sizing a SAN is extremely important and should not be taken lightly.
You should contact and talk to copilot about performance issues when failing the drive. A good business partner will also be able to help you out also. I have had this with some of our customers, but have been able to resolve it with some tweaks.
The reason for the SLC and MLC tiering is that SLC is more expensive and write happy and MLC is cheaper but read happy. SLC has smaller drive sizes, 200Gb and 400Gb and MLC has much larger drives size, 1.6Tb I believe. All flash storage is a consumable so it is important that you manage it correctly and data progression will allow that to happen without you having to manage it.
Enjoy and contact Bob Fine. Pretty cool that he offered, had not seen the same from other vendors on here....