30.03.2020 01:30, Victor Hooi пишет: > Hi, > > I have a small 12-bay SuperMicro server I'm using as a local NAS, with > FreeNAS/ZFS. > > Each drive is a 12TB HDD. > > I'm in the process of moving it to Linux - and I thought this might be > a good chance to try out BTRFS again =). > > (I'd previously tried BTRFS many years a go, and hit some issues - > it's possible this may have been made worse by my inexperience with > BTRFS at the time - e.g. > https://www.spinics.net/lists/linux-btrfs/msg04240.html) > > Anyhow - currently the server has a 750GB Intel Optane drive, that > we're using as a ZLOG/SIL drive: > Do you mean ZIL/SLOG? ZIL == ZFS Intent Log, SLOG == SSD Log. > https://www.ixsystems.com/community/threads/how-best-to-use-960gb-optane-in-freenas-build.75798/#post-527264 > > My question is - what's the equivalent in BTRFS-land? > Not on btrfs level. I guess using bcache on top of btrfs may achieve some similar effects. > Or what is the best way to use an ultra-fast Intel Optane drive to > accelerate reads/writes on a BTRFS array? > ZIL is *write* intent log, it does not directly accelerates reads. ZFS supports SSD as second-level read cache, but as far as I remember it is physically separate from ZIL.
