On 2017-02-05 23:26, Duncan wrote:
Hans van Kranenburg posted on Sun, 05 Feb 2017 22:55:42 +0100 as
excerpted:
On 02/05/2017 10:42 PM, Alexander Tomokhov wrote:
Is it possible, having two drives to do raid1 for metadata but keep
data on a single drive only?
Nope.
Would be a really nice feature though... Putting metadata on SSD and
bulk data on HDD...
FWIW, it's on the list to be implemented in the future, but there's a lot
more things on that list than devs working on btrfs, and the feature
development and stabilization trend is that features often take much
longer than anticipated, particularly to properly stabilize (to the level
of the rest of btrfs, which is in general stabilizing but not yet fully
stable, so stabilization is relative, here), which has slowed down the
pipeline of new features due to the devs having their hands full
stabilizing currently done but not yet properly stabilized features.
There are also a number of higher priority features than this. While it
would be a wonderful feature to have, it doesn't exactly have a
particularly significant impact on broad usability. Most of the
features being actively worked on are trying to gain parity (no pun
intended) with other multi-device storage stacks. Working quotas,
parity-RAID, hot-spares, and n-way replication are all pretty
significant to the usability of BTRFS in a pretty large number of
situations, which is a large part of why they (other than n-way
replication) are the primary focus right now for development.
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