[Gluster-devel] replicate with 5 nodes - and adding more nodes in the future

Anand Avati avati at zresearch.com
Wed Jun 27 10:07:52 UTC 2007


Please try with io-threads on the server side (between protocol/server and
posix)

avati

2007/6/27, Shai DB <dbshai at gmail.com>:
>
> after copying some few thousands files and deleting and copying again
> i get a lot of errors:
> File descriptor in bad state
> No such file or directory
>
> and a lot of
> [Jun 26 05:45:13] [CRITICAL/tcp.c:81/tcp_disconnect()]
> transport/tcp:server:
> connection to server disconnected
> [Jun 26 05:45:13] [ERROR/common-utils.c:55/full_rw()]
> libglusterfs:full_rw:
> 0 bytes r/w instead of 113 (errno=9)
>
> in the glusterd.log
>
> I have set it up like this:
>
> 1.3-pre4
>
> 5 servers + 5 clients (running on same boxes as servers).
> what could cause the disconnection ?
>
> server:
>
> volume gfs
>   type storage/posix
>   option directory /mnt/gluster/gfs1
> end-volume
>
> volume gfs-afr
>   type storage/posix
>   option directory /mnt/gluster/afr-gfs1
> end-volume
>
> volume server
>   type protocol/server
>   option transport-type tcp/server
> option listen-port 6996
>   subvolumes gfs gfs-afr
>   option auth.ip.gfs.allow *
>   option auth.ip.gfs-afr.allow *
> end-volume
>
>
> client:
> volume gfs
>   type storage/posix
>   option directory /mnt/gluster/gfs1
> end-volume
>
> volume gfs-afr
>   type storage/posix
>   option directory /mnt/gluster/afr-gfs1
> end-volume
>
> volume server
>   type protocol/server
>   option transport-type tcp/server
> option listen-port 6996
>   subvolumes gfs gfs-afr
>   option auth.ip.gfs.allow *
>   option auth.ip.gfs-afr.allow *
> end-volume
> [root at hd-t1157cl etc]# cat cluster-client.vol
> volume a1
>   type protocol/client
>   option transport-type tcp/client
>   option remote-host 10.47.0.10
>   option remote-port 6996
>   option remote-subvolume gfs
> end-volume
>
> volume a2
>   type protocol/client
>   option transport-type tcp/client
>   option remote-host 10.47.0.10
>   option remote-port 6996
>   option remote-subvolume gfs-afr
> end-volume
>
> volume b1
>   type protocol/client
>   option transport-type tcp/client
>   option remote-host 10.47.0.11
>   option remote-port 6996
>   option remote-subvolume gfs
> end-volume
>
> volume b2
>   type protocol/client
>   option transport-type tcp/client
>   option remote-host 10.47.0.11
>   option remote-port 6996
>   option remote-subvolume gfs-afr
> end-volume
>
> volume c1
>   type protocol/client
>   option transport-type tcp/client
>   option remote-host 10.47.0.12
>   option remote-port 6996
>   option remote-subvolume gfs
> end-volume
>
> volume c2
>   type protocol/client
>   option transport-type tcp/client
>   option remote-host 10.47.0.12
>   option remote-port 6996
>   option remote-subvolume gfs-afr
> end-volume
>
> volume d1
>   type protocol/client
>   option transport-type tcp/client
>   option remote-host 10.47.0.13
>   option remote-port 6996
>   option remote-subvolume gfs
> end-volume
>
> volume d2
>   type protocol/client
>   option transport-type tcp/client
>   option remote-host 10.47.0.13
>   option remote-port 6996
>   option remote-subvolume gfs-afr
> end-volume
>
> volume e1
>   type protocol/client
>   option transport-type tcp/client
>   option remote-host 10.47.0.14
>   option remote-port 6996
>   option remote-subvolume gfs
> end-volume
>
> volume e2
>   type protocol/client
>   option transport-type tcp/client
>   option remote-host 10.47.0.14
>   option remote-port 6996
>   option remote-subvolume gfs-afr
> end-volume
>
>
> volume afr1
>   type cluster/afr
>   subvolumes a1 e2
>   option replicate *:2
> end-volume
>
> volume afr2
>   type cluster/afr
>   subvolumes b1 d2
>   option replicate *:2
> end-volume
>
> volume afr3
>   type cluster/afr
>   subvolumes c1 a2
>   option replicate *:2
> end-volume
>
> volume afr4
>   type cluster/afr
>   subvolumes d1 b2
>   option replicate *:2
> end-volume
>
> volume afr5
>   type cluster/afr
>   subvolumes e1 c2
>   option replicate *:2
> end-volume
>
>
> volume gfstest
>   type cluster/unify
>   subvolumes afr1 afr2 afr3 afr4 afr5
>   option scheduler rr
>   option rr.limits.min-free-disk 5GB
> end-volume
>
>
>
> On 6/26/07, Sebastien LELIEVRE <slelievre at tbs-internet.com> wrote:
> >
> > Hi again !
> >
> > Shai DB a écrit :
> > > another question
> > > I notice that 1.2 dont have the AFR on its source
> > > how can i use/install it anyway ?
> > > i saw 1.3-pre has it..
> > > is the 1.3-pre OK for production ?
> > > thanks
> > >
> >
> > I had forgotten this point ! :)
> >
> > Yes, 1.3-pre4 archive is stable enough for production, but you can also
> > use the tla repository with the branch 2.4 which is stable enough (to
> > me) to be used in production.
> >
> > Just note that the 1.3 stable release will be based on the 2.5
> > mainbranch and will include self-heal feature (and many more !)
> >
> > Cheers,
> >
> > Sebastien LELIEVRE
> > slelievre at tbs-internet.com           Services to ISP
> > TBS-internet                   http://www.TBS-internet.com
> >
> > > I need it for replication (to have 2 copies of data in case of crash)
> > >
> > >
> > > On 6/26/07, *Sebastien LELIEVRE* <slelievre at tbs-internet.com
> > > <mailto:slelievre at tbs-internet.com>> wrote:
> > >
> > >     Hi,
> > >
> > >     I just wanted to stress this :
> > >
> > >     Shai a écrit :
> > >     > Hello, we are testing glusterfs 1.2 and I have few questions -
> > >
> > >     1.2 doesn't bring "self-heal" with it, so keep in mind that if a
> > drives
> > >     crashes, you would have to sync your new drive "manually" with the
> > >     others.
> > >
> > >
> > > so to just copy all data to the replaced disk from his afr 'pair' ?
> > >
> > >
> > >     BUT, 1.3 is going to correct this, and this is good :)
> > >
> > >     That's all I had to add
> > >
> > >     Cheers,
> > >
> > >     Sebastien LELIEVRE
> > >     slelievre at tbs-internet.com
> > >     <mailto:slelievre at tbs-internet.com>           Services to ISP
> > >     TBS-internet                   http://www.TBS-internet.com
> > >
> > >     Krishna Srinivas a écrit :
> > >     > As of now you need to restart glusterfs if there is any change
> > >     > in the config spec file. However in future versions you wont
> need
> > >     > to remount (This is in our road map)
> > >     >
> > >     > On 6/25/07, Shai DB <dbshai at gmail.com <mailto:dbshai at gmail.com>>
> > >     wrote:
> > >     >> thanks for the answer
> > >     >> this seems easy and neat to setup
> > >     >>
> > >     >> another question is, if i add 2 more nodes to the gang
> > >     >> how can i setup all the clients with the new configuration,
> > without
> > >     >> need to
> > >     >> 'remount' the glusterfs ?
> > >     >>
> > >     >> Thanks
> > >     >>
> > >     >>
> > >     >> On 6/25/07, Krishna Srinivas <krishna at zresearch.com
> > >     <mailto:krishna at zresearch.com>> wrote:
> > >     >> >
> > >     >> > On 6/25/07, Shai DB < dbshai at gmail.com
> > >     <mailto:dbshai at gmail.com>> wrote:
> > >     >> > > Hello, we are testing glusterfs 1.2 and I have few
> questions
> > -
> > >     >> > >
> > >     >> > >
> > >     >> > > 1. we are going to store millions of small jpg files that
> > >     will be
> > >     >> read
> > >     >> > by
> > >     >> > > webserver - is glusterfs good solution for this ?
> > >     >> >
> > >     >> > Yes, definitely.
> > >     >> >
> > >     >> > > 2. we are going to run both server+clients on each node
> > >     together with
> > >     >> > apache
> > >     >> > >
> > >     >> > > 3. replicate *:2
> > >     >> > >
> > >     >> > > the way i think doing replicate is defining on each server
> 2
> > >     >> volumes and
> > >     >> > > using AFR:
> > >     >> > >
> > >     >> > > server1: a1, a2
> > >     >> > > server2: b1, b2
> > >     >> > > server3: c1, c2
> > >     >> > > server4: d1, d2
> > >     >> > > server5: e1, e2
> > >     >> > >
> > >     >> > > afr1: a1+b2
> > >     >> > > afr2: b1+c2
> > >     >> > > afr3: c1+d2
> > >     >> > > afr4: d1+e2
> > >     >> > > afr5: e1+a2
> > >     >> > >
> > >     >> > > and then unify = afr1+afr2+afr3+afr4+afr5 with replicate
> > option
> > >     >> > >
> > >     >> > > is this correct way ?
> > >     >> > > and what to do on the future when we add more nodes ? when
> > >     >> changing the
> > >     >> > afr
> > >     >> > > (adding and changing the couples) making glusterfs
> > >     >> > > redistribute the files the new way ?
> > >     >> >
> > >     >> > Yes this is the right way. If you add one more server f, the
> > one
> > >     >> solution
> > >     >> > is to move contents of a2 to f2 and clean up a2 and have it
> as
> > >     >> following:
> > >     >> >
> > >     >> > afr5: e1 + f2
> > >     >> > afr6: f1 + a2
> > >     >> >
> > >     >> > Cant think of an easier solution.
> > >     >> >
> > >     >> > But if we assume that you will always add 2 servers when you
> > >     want to
> > >     >> add,
> > >     >> > we can have the setup in following way:
> > >     >> > afr1: a1 + b2
> > >     >> > afr2: b1 + a2
> > >     >> > afr3: c1 + d2
> > >     >> > afr4: d1 + c2
> > >     >> > afr5: e1 + f2
> > >     >> > afr6: f1 + e2
> > >     >> >
> > >     >> > Now when you add a pair of servers to this (g, h):
> > >     >> > afr7: f1 + h2
> > >     >> > afr8: h1 +f2
> > >     >> >
> > >     >> > Which is very easy. But you will have to add 2 servers
> > everytime.
> > >     >> > The advantage is that it is easier to visualize the setup and
> > add
> > >     >> > new nodes.
> > >     >> >
> > >     >> > Thinking further, if we assume that you will replicate all
> the
> > >     files
> > >     >> > twice (option replicate *:2) you can have the following
> setup:
> > >     >> > afr1: a + b
> > >     >> > afr2: c + d
> > >     >> > afr3: e + f
> > >     >> >
> > >     >> > This is a very easy setup. It is simple to add a fresh pair
> > >     (afr4: g
> > >     >> +h)
> > >     >> >
> > >     >> > You can have whatever setup you want depending on your
> > >     >> > convinience and requirement.
> > >     >> >
> > >     >> > >
> > >     >> > > 4. what happens when a hard drive goes down and replaces,
> the
> > >     cluster
> > >     >> > also
> > >     >> > > redistribute the files ?
> > >     >> >
> > >     >> > When a hard drive is replaced, missing files will be
> replicated
> > >     from
> > >     >> the
> > >     >> > AFR's other child.
> > >     >> >
> > >     >> > Regards
> > >     >> > Krishna
> > >     >> >
> > >     >> > -------
> > >     >> >
> > >     >> > The best quote ever : '
> > >     >> >
> >
> >
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-- 
Anand V. Avati



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