[Gluster-devel] Re: AFR load-balancing

[Krishna Srinivas]

On Nov 27, 2007 7:55 PM, Székelyi Szabolcs <cc at avaxio.hu> wrote:
> Krishna Srinivas wrote:
> > On Nov 16, 2007 11:48 PM, Székelyi Szabolcs <cc at avaxio.hu> wrote:
> >> Krishna Srinivas wrote:
> >>> "option read-node <sobvol>" will read from that particular subvol
> >>> (this will help when that subvol is local storage)
> >>> "option read-node *" will load balance from all children.
> >>> So option is either * or one of the subvols.
> >>> default is "option read-node *"
> >>> What do you think about it?
> >>
> >> What about explicitly listing the subvolumes to perform load-balancing
> >> between? For example, "option read-nodes child1 child3" could cause AFR
> >> to load-balance reads between child1 and child3, while writing to all
> >> its children (child[1-3], say). The default option could be to read from
> >> the first child. "option read-nodes *" could still mean to use all
> >> subvolumes.
> >
> > We thought about "option read-node child1,child3" but this wont really
> > be used in the sense that users would want to read either from local
> > storage or all the children. But there might be a case where one of the
> > sobvols might be a low end machine where we dont want to schedule
> > reads. Still thinking if it is worth implementing this particular feature.
>
> Consider the situation when I want to have 4-5 local (ie. on-site)
> mirrors for (read) performance, and also a few remote (ie. off-site, on
> the other end of a lower bandwidth link) for backup. This is not an
> unusual setup.

In that case let me put it under TODO list :-)

Krishna