Re: [MooseFS-Users] Two mounts or one? what has better performance

[Ricardo J. B. <ric...@do...>]

El Lunes 06/02/2017, Jakub Kruszona-Zawadzki escribió:
> On 2 Feb, 2017, at 19:28, WK <wk...@bn...> wrote:
> > We have a project where we have a machine that is talking to a MFS3
> > cluster for two purposes
> >
> > The main purpose is a very busy file repo, we are also copying off large
> > archives in to a backup folder 2-3 times a day.
> >
> > We want to reduce latency on the files as the client is somewhat picky
> > and want to avoid the archive dump slowing things down.
> >
> > What is the best way to handle that
> >
> > A) one mfsmount to /mfs3mnt
> >
> > with subdirectory /mfs3mnt/backup  & /mfs3mnt/files
> >
> >
> > b) Two seperate mfsmounts on the client
> >
> > /mfs3backup
> >
> > and
> >
> > /mfs3files
> >
> > Security isolation is not a concern.
> >
> > So what would provide the best performance? or does it really matter?
> >
> > The connection would be 1GB ethernet with jumbo frames.
> >
> >
> > Note we are considering that with two mounts we could use seperate
> > ethernet cards, however its not an option immediately as the host has
> > used up all the ports with other needs.
> >
> > If you feel strongly that would make a difference then I can push a host
> > migration on the client.
> >
> > And of course 10G is getting reasonable, but still not a default on our
> > somewhat older kit.
> >
> > -wk
>
> The main difference will be cache. In case of one mount you will have one
> cache shared between users ('files' folder) and your backup ('backup'
> folder). In case of two mounts you will have two independent caches. I do
> not expect big difference but still it may improve a little bit.

Also, copying/moving files between mountpoints is going to be slower than if 
you have files and backup on the same mountpoint.

PS: Jakub, is this your signature or something went wrong?:
"Segmentation fault (core dumped)"

Cheers,
-- 
Ricardo J. Barberis
Senior SysAdmin / IT Architect
DonWeb
La Actitud Es Todo
www.DonWeb.com
  _____