W dniu 26.08.2016 o 04:10, Kent Overstreet pisze:

On Thu, Aug 25, 2016 at 02:03:33PM +0200, Marcin Mirosław wrote:

quoted

https://lwn.net/Articles/655183/ :
"Caveat: don't try to use tiering and checksumming or compression at the
same time yet, the read path needs to be reworked to handle both at the
same time."

Is it sill valid?

No, I did do that read path reworking, they should work.

However, I haven't been focusing on or exercising the multi device stuff in
quite awhile - my main priority has been making single device filesystems rock
solid and finishing off compression and such.

Tiering ought to work, but can you hold off on exercising anything else? e.g.
the active/RO transition stuff - I'm going to have to spend a fair amount of
time digging into that code and figuring out what makes sense when the time
comes.

Ok, I'll focuse on one disk bcachefs.

The checksum error is highly concerning though - that was related to messing
with cache0/state, correct? I think Christopher is using tiering with
checksumming enabled, can you confirm?

Yes, I only did echo "readonly", next "active" to >state. It was enough
to get BUG in kern.log.

Marcin