Re: Using Intel Optane to accelerate a BTRFS array? (equivalent of ZLOG/SIL for ZFS?)

[Roman Mamedov <rm@romanrm.net>]

On Tue, 31 Mar 2020 13:31:19 -0400
Eli V <eliventer@gmail.com> wrote:

> Yes using lvm cache is an option, and will give you actual caching of
> the data files as well. However, in my experience it doesn't do much
> caching of metadata so using it on large filesystems doesn't seem to
> improve interactive usage much at all, i.e. ls -l, or btrfs filesystem
> usage etc.

Forgot to mention that in my case (on a large media server) I had great
results with the described setup, especially noticeable in the mount time.
Walking large directories in a GUI file manager was more responsive too. Not
to mention mass deletion of snapshots. LVM cache seemed to know well to avoid
polluting itself with infrequently accessed sequential-pattern bulk operations
(i.e. copying or reading back the actual file data) and appeared to cache
mostly the metadata as it should. For anyone considering this, give it a try,
and give it at least a few days of normal usage to properly warm up.

-- 
With respect,
Roman