On 11/30/18 2:23 PM, Ethan O'Toole via vcf-midatlantic wrote:
In my research on AWS Glacier it appears they use special hard drives that spin at lower speeds, and then power down the disks when full? The disks are connected to custom multiplexors. But there might be optical or tape in the mix somehow? Another service that makes me wonder how they do it.
I'm sure a lot of it is based on hierarchical storage based on access patterns. On some of my clients' systems we've seen some odd (bot not problematic) delays in accessing some seldom-accessed datasets that can only be explained by something having been spun down, or migrated off to higher-capacity, lower-speed storage. They do have some damn impressive technology there. (of course we were doing that in 1993, but the WAY they'd have to be doing it, on that scale, is mind-blowing) -Dave -- Dave McGuire, AK4HZ New Kensington, PA