On Sun, Mar 23, 2008 at 02:59:28PM -0700, Tracy R Reed wrote:
http://lwn.net/Articles/272534/
I really like this idea. Memory is plentiful and cheap. Good hardware is
quite reliable these days and if you put a UPS behind it I could conceive
of eventually putting a production database or some other seek-heavy
application on such a storage system.
I've been reading the feedback on LKML to this request. Someone asked him
the basic question (same one I asked) as to how this differs from just
mounting the filesystem normally with auto-flushing turned off.
Basically, he's too confrontational for his patches to be accepted. He
doesn't listen to people suggestions.
The basic concensus seems to be that the technique he uses to write back to
disk really isn't all that useful. If there is a failure, you're going to
have to restore it from some kind of backup.
One suggestion was to just mount a normal ramdisk and have a user-space
program use dnotify to synchronize with a disk filesystem. The disk
filesystem would have normal journalling and such.
Now if someone could just figure out how to not require every directory to
be watched explicitly with dnotify, so that it could be useful for
something like this.
David
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