Submitted by tyamadajp on Wed, 02/04/2009 - 02:46.
Comparing SSDs and HDDs,
- SSDs' cost-per-capacity is still 20x inferior to HDDs (~$500 for 256GB SSD, ~$100 for 1TB HDD as of 2009/1)
- SSDs have 100x faster random access speed (~100us in contrast to ~10ms of HDDs)
- Sequential read performance is almost equivalent.
- HDDs are generally better in write performance.
Although SSDs are improving, those improved ones tend to be even more costly
compared to HDDs. Wouldn't it be great to have software-based HDD+SSD hybrid
out of low-end HDD and SDD? Linux already uses RAM for caching, but adding SSD as
2nd-level cache might worth considering, especially for "read-mostly" usecases
like multimedia content streaming.
