Re: support for physical ramdisk

[Kent Overstreet <kent.overstreet-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On 01/19/2011 07:34 PM, Cory Coager wrote:
> Sounds great, when will it be ready? ;-)

Well, good question. I've been short funding and thus time for bcache 
lately; not sure what's happening there just yet.

And there's a bunch of things on my todo list; my main priority has been 
the code for a bcache specific block device and superblock for the 
backing device. After that is multiple cache devices, volume management 
and tiered storage, but there's no set order those and 
journalling/external journal support need to be done in.

>
> On 01/19/2011 08:27 PM, Kent Overstreet wrote:
>> Well, ram is more expensive per gigabyte than SSDs, particularly if
>> you've got something with a battery attached - the idea would be to
>> use your SSD for buffering 80 gb or so of writes, but then buffer all
>> of bcache's metadata writes in battery backed-up ram, significantly
>> decreasing the number of write IOPS to the SSD, and making it so
>> pretty much all the writes to the SSD are big contiguous writes.

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