[Gluster-devel] Which subvolume comes first?

[Krishna Srinivas]

On Fri, May 2, 2008 at 7:44 AM, Christopher Hawkins
<chawkins at veracitynetworks.com> wrote:
> On a related note to [  RE: [Gluster-devel] The "df" command again  ], how
>  do you control which subvolume is connected to first? In my setup the client
>  always seems to want the second one (of two). Ie.:
>
>  #
>  volume afr
>  subvolumes server-a server-b
>  #
>
>  The client likes server-b. Is this always true, or how does that decision
>  get made?

The subvol specified first in the list is the first. There is no other decision
logic. How did you conclude your client likes server-b? :)

Krishna

>
>  Thanks,
>  Chris
>
>  > -----Original Message-----
>  > From:
>  > gluster-devel-bounces+chawkins=veracitynetworks.com at nongnu.org
>  >
>  > [mailto:gluster-devel-bounces+chawkins=veracitynetworks.com at no
>  ngnu.org] On Behalf Of Brandon Lamb
>  > Sent: Thursday, May 01, 2008 9:03 PM
>  > To: Amar S. Tumballi
>  > Cc: Gluster Devel
>  > Subject: Re: [Gluster-devel] The "df" command again
>  >
>  > On Thu, May 1, 2008 at 5:59 PM, Amar S. Tumballi
>  > <amar at zresearch.com> wrote:
>  > > On Thu, May 1, 2008 at 5:37 PM, Brandon Lamb
>  > <brandonlamb at gmail.com> wrote:
>  > > > Was there an option added somewhere to be able to choose
>  > whether to
>  > > > dispaly the least or most amount of disk space? I added
>  > info on this
>  > > > to the AFR things to know on the wiki, but I was
>  > wondering if maybe
>  > > > there was actually an option of how glusterfs displays that info.
>  > > >
>  > > There is no behavior option for 'df' in glusterfs. Its a
>  > question of
>  > > what is right. For example,
>  > > * unify shows unified space.
>  > > * stripe shows unified space.
>  > > * afr shows 'df' from one node.
>  > >
>  > > So, here we don't have any doubts about what to show in
>  > case of unify
>  > > and stripe. But in afr the question of which subvolume
>  > comes. Earlier
>  > > as user had the option of 'option replicate *' in afr,
>  > showing the df
>  > > of first subvolume made sense. But with uniform distribution of afr
>  > > data now, we have to show the 'df' from the subvolume which
>  > had minimum free disk.
>  > >
>  > > Currently 1.3.8 shows df from first subvolume. But, the
>  > patch to show
>  > > the 'df' from the subvolume with min free disk space has
>  > gone into archive.
>  >
>  > So to clarify, the wiki should be changed from
>  >
>  > When doing a "df -h" on a client, the AVAILABLE disk space
>  > will display the maximum disk space of the servers in the
>  > cluster. So if you have two servers with 50 gigs and 100 gigs
>  > of free disk space, you will see 100 gigs available even
>  > though one server only has 50 gigs free
>  >
>  > to this?
>  >
>  > When doing a "df -h" on a client, the AVAILABLE disk space
>  > will display the maximum disk space of the first AFR sub
>  > volume defined in the spec file. So if you have two servers
>  > with 50 gigs and 100 gigs of free disk space, and the server
>  > with 100 gigs is listed first, then you will see 100 gigs
>  > available even though one server only has 50 gigs free
>  >
>  >
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