Just recently I read an article by one of Godaddy’s engineers about this very topic: Learning to Deal with Learning On their hardware (Dell PERC cards) battery learning cycle happens every 90 days, but no way to know when exactly it’ll happen, ie during peak or off-peak hours. They talked about different solutions: Outright disable … Read more
Since CacheCade SSDs can be used for write and read cache, what purpose does the RAID controller’s onboard NVRAM play? If you leave the write caching feature of the controller enabled, the NVRAM will still be used primarily. The SSD write cache will typically only be used for larger quantities of write data, where the … Read more
In short: if using a low-end RAID card (without cache), do yourself a favor and switch to software RAID. If using a mid-to-high-end card (with BBU or NVRAM), then hardware is often (but not always! see below) a good choice. Long answer: when computing power was limited, hardware RAID cards had the significant advantage to … Read more