The seek to read ratio of RAM is very roughly comparable to that of SSD and to that of HDD.
Totally untrue. SSDs seek faster than HDDs, but HDDs have higher bandwidth than SSDs. This is true almost across the board. I don't know where you got the idea that this isn't true.
And with RAM (DDR specifically) you can generally pipeline accesses, thus negating the bandwidth penalty due to bank open latency. Not true of a single HDD.
What would you change specifically in a file system optimized for SSD?
Drop the notion that you gain any benefit from spatial locality. You're then freed from any data layout constraint and can do great things like content-based addressing.
Don't believe me? These guys are building an empire on this idea: http://www.xtremio.com/ (Disclaimer: I work there.)
Totally untrue. SSDs seek faster than HDDs, but HDDs have higher bandwidth than SSDs. This is true almost across the board. I don't know where you got the idea that this isn't true.
And with RAM (DDR specifically) you can generally pipeline accesses, thus negating the bandwidth penalty due to bank open latency. Not true of a single HDD.
What would you change specifically in a file system optimized for SSD?
Drop the notion that you gain any benefit from spatial locality. You're then freed from any data layout constraint and can do great things like content-based addressing.
Don't believe me? These guys are building an empire on this idea: http://www.xtremio.com/ (Disclaimer: I work there.)