On 13/09/2014 08:01, martin f krafft wrote:
Assuming there is a MMC fast enough out there, how about creating a RAID1 across MMC and parts of the rotational disk, with the rotational disk flagged --write-mostly? This RAID would then hold the system, while the data would sit on the rotational disk.
1) Firstly, MMC, SD etc are all very slow in random access. They are optimized for physical size and not for speed.
2) Secondly, in order to use --write-mostly, you need two devices of the same size, so you need an MMC as big as your HDD.
Something different from (2) is called SSD-caching, and in Linux kernel there are two approaches to do that, one is dm-cache and the other is bcache. Both are very young and I don't know how much stable.
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