Re: [MooseFS-Users] Real experiences from real users

[Gandalf C. <gan...@gm...>]

Il giorno mar 22 mag 2018 alle ore 07:55 Jakub Kruszona-Zawadzki
<jak...@ge...> ha scritto:
> Once I was considering adding compression on the chunkserver layer (just to compress chunks not modified in X days by chunkserver). This is quite simple to implement, but we made tests in our cluster and have found that only 1/10th of chunks are "compressible" and the ratio was not so good (about 2x).

it seems that using ZFS without any kind of redundancy (so, using one
pool per disks, even with failmode=continue) is not good (this is what
ZFS mailing list told me.
So, as ZFS mailing list doesn't suggest to use ZFS in one pool per
disk, adding compression directly to MooseFS (with the ability to
enable or disable the feature) could be an interesting idea, but why
compressing only unmodified chunks and not all chunks ?