[Drbd-dev] New Features: write-back cache mode
lars.ellenberg at linbit.com
Sun Sep 21 01:19:38 CEST 2008
On Sat, Sep 20, 2008 at 05:04:44PM -0600, Morey Roof wrote:
> This is pretty much what I was thinking. For the btree, generations,
> and ref-count a good example to look at is how btrfs (This is the other
> project I have started to mess with) works. The design is very
> efficient and I think we could use a very close match for our setup. I
> haven't read the paper you sent yet but will get to that today.
> Let me know how you would like to start and I can start working a proof
> of concept and we can see how to go from there.
I still think that should be implemented as a
generic device-mapper write-back target,
not as part of drbd.
there is already some caching target out there somewhere,
using small local low-latency disks as cache
for higher latency "remote" iSCSI or GNBD disks.
At least I read something like that
on one of the linux thin clients projects a while ago.
I did not look at the code, and never used it, though.
a 10 second google suggests that
is what I mean.
maybe you can use that as a starting point,
and point it to a ram disk as cache?
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com
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