[Gluster-users] Reading directly from brick

[Dave Jenkins]

On 6 September 2011 21:24, Reinis Rozitis <r at roze.lv> wrote:
> Question was about reads though and then the answer is it is perfectly fine
> (and faster) to do reads directly from the filesystem (in replicated setups)
> if you keep in mind that by doing so you lose the Glusters autoheal eature
>  - eg if one of the gluster nodes goes down and there is a file written
> meanwhile when the server comes up if you access the file directly it won't
> show up while it would when accessing it via the gluster mount point (you
> can work arround it by manually triggering the self heal).

Thanks, that's very helpful.

>> I've heard that reads from glusterfs are around 20 times slower than from
>> ext3:
>
> "20 times" might be fetched out of thin air but of course there is a
> significant overhead of serving a file from a gluster which basically
> involves network operations and additional meta data checks versus fetching
> the file directly from iron.

The figure came from a PostMark test quoted in the link in my original
post: http://groups.drupal.org/node/61908#comment-193143 .

Thanks again,

Dave