Thanks. Much clearer now.
If I have 500 GB of memory, Violin looks like a much better way than Ramback to use it. The reason is that it better answers my mistrust of the battery, hardware, and Linux. I can put multiple Violins in a RAID array and when the battery, hardware, or Linux fails in one, I don't lose data. And it looks roughly as fast as Ramback.
If I do put 500 GB of memory in the application server, I think I'd just like to add it to the pool and let the memory manager decide if caching all the contents of my filesystems is the best use for it. Maybe with some parameters to say I trust my battery, hardware, and Linux enough that Linux need not hurry to write any of it back to disk.
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