On Wed, Nov 25, 2020 at 05:14:51PM +0000, Daire Byrne wrote: > Cool. I'm glad there are some notes for others to reference - this > thread is now too long for any human to read. The only things I'd > consider adding are: Thanks, done. > * re-export of NFSv4.0 filesystem can give input/output errors when the cache is dropped Looking back at that thread.... I suspect that's just unfixable, so all you can do is either use v4.1+ on the original server or 4.0+ on the edge clients. Or I wonder if it would help if there was some way to tell the 4.0 client just to try special stateids instead of attempting an open? > * a weird interaction with nfs client readahead such that all reads > are limited to the default 128k unless you manually increase it to > match rsize. > > The only other thing I can offer are tips & tricks for doing this kind > of thing over the WAN (vfs_cache_pressure, actimeo, nocto) and using > fscache. OK, I haven't tried to pick that out of the thread yet. --b.
