Dear,
In your last message i has understood, the exclusive-lock is work in kernel 4.9
or higher and this could help-me, with don't permission write in two machines,
but this feature only avaible in kernel 4.12, is right ?
I will reading more about the pacemaker, in my environment testing, i Would use
the heartbeat, but the pacemaker it seams to be one alternative better.
Thanks a Lot
Marcelo
>>>By default, since 4.9,
> > >> > > when the exclusive-lock feature is enabled, only a single client
> > >> > > can write to
> > >> > the
> > >> > > block device at a time -
Em 14/07/2017, Nick Fisk <n...@fisk.me.uk> escreveu:
>
>
> > -----Original Message-----
> > From: ceph-users [mailto:ceph-users-boun...@lists.ceph.com] On Behalf Of Jason Dillaman
> > Sent: 14 July 2017 16:40
> > To: li...@marcelofrota.info
> > Cc: ceph-users <ceph-users@lists.ceph.com>
> > Subject: Re: [ceph-users] Ceph mount rbd
> >
> > On Fri, Jul 14, 2017 at 9:44 AM, <li...@marcelofrota.info> wrote:
> > > Gonzalo,
> > >
> > >
> > >
> > > You are right, i told so much about my enviroment actual and maybe i
> > > didn't know explain my problem the better form, with ceph in the
> > > moment, mutiple hosts clients can mount and write datas in my system
> > > and this is one problem, because i could have filesystem corruption.
> > >
> > >
> > >
> > > Example, today, if runing the comand in two machines in the same time,
> > > it will work.
> > >
> > >
> > >
> > > mount /dev/rbd0 /mnt/veeamrepo
> > >
> > > cd /mnt/veeamrepo ; touch testfile.txt
> > >
> > >
> > >
> > > I need ensure, only one machine will can execute this.
> > >
> >
> > A user could do the same thing with any number of remote block devices (i.e. I could map an iSCSI target multiple times). As I said
> > before, you can use the "exclusive" option available since kernel 4.12, roll your own solution using the advisory locks available from
> > the rbd CLI, or just use CephFS if you want to be able to access a file system on multiple hosts.
>
> Pacemaker, will also prevent a RBD to be mounted multiple times, if you want to manage the fencing outside of Ceph.
>
> >
> > >
> > > Thanks a lot,
> > >
> > > Marcelo
> > >
> > >
> > > Em 14/07/2017, Gonzalo Aguilar Delgado <gagui...@aguilardelgado.com>
> > > escreveu:
> > >
> > >
> > >> Hi,
> > >>
> > >> Why you would like to maintain copies by yourself. You replicate on
> > >> ceph and then on different files inside ceph? Let ceph take care of counting.
> > >> Create a pool with 3 or more copies and let ceph take care of what's
> > >> stored and where.
> > >>
> > >> Best regards,
> > >>
> > >>
> > >> El 13/07/17 a las 17:06, li...@marcelofrota.info escribió:
> > >> >
> > >> > I will explain More about my system actual, in the moment i have 2
> > >> > machines using drbd in mode master/slave and i running the
> > >> > aplication in machine master, but existing 2 questions importants
> > >> > in my enviroment with drbd actualy :
> > >> >
> > >> > 1 - If machine one is master and mounting partitions, the slave
> > >> > don't can mount the system, Unless it happens one problem in
> > >> > machine master, this is one mode, to prevent write in filesystem
> > >> > incorrect
> > >> >
> > >> > 2 - When i write data in machine master in drbd, the drbd write
> > >> > datas in slave machine Automatically, with this, if one problem
> > >> > happens in node master, the machine slave have coppy the data.
> > >> >
> > >> > In the moment, in my enviroment testing with ceph, using the
> > >> > version
> > >> > 4.10 of kernel and i mount the system in two machines in the same
> > >> > time, in production enviroment, i could serious problem with this
> > >> > comportament.
> > >> >
> > >> > How can i use the ceph and Ensure that I could get these 2
> > >> > behaviors kept in a new environment with Ceph?
> > >> >
> > >> > Thanks a lot,
> > >> >
> > >> > Marcelo
> > >> >
> > >> >
> > >> > Em 28/06/2017, Jason Dillaman <jdill...@redhat.com> escreveu:
> > >> > > ... additionally, the forthcoming 4.12 kernel release will
> > >> > > support non-cooperative exclusive locking. By default, since 4.9,
> > >> > > when the exclusive-lock feature is enabled, only a single client
> > >> > > can write to
> > >> > the
> > >> > > block device at a time -- but they will cooperatively pass the
> > >> > > lock
> > >> > back
> > >> > > and forth upon write request. With the new "rbd map" option, you
> > >> > > can
> > >> > map a
> > >> > > image on exactly one host and prevent other hosts from mapping
> > >> > > the
> > >> > image.
> > >> > > If that host should die, the exclusive-lock will automatically
> > >> > > become available to other hosts for mapping.
> > >> > >
> > >> > > Of course, I always have to ask the use-case behind mapping the
> > >> > > same
> > >> > image
> > >> > > on multiple hosts. Perhaps CephFS would be a better fit if you
> > >> > > are
> > >> > trying
> > >> > > to serve out a filesystem?
> > >> > >
> > >> > > On Wed, Jun 28, 2017 at 6:25 PM, Maged Mokhtar
> > >> > <mmokh...@petasan.org> wrote:
> > >> > >
> > >> > > > On 2017-06-28 22:55, li...@marcelofrota.info wrote:
> > >> > > >
> > >> > > > Hi People,
> > >> > > >
> > >> > > > I am testing the new enviroment, with ceph + rbd with ubuntu
> > >> > 16.04, and i
> > >> > > > have one question.
> > >> > > >
> > >> > > > I have my cluster ceph and mount the using the comands to ceph
> > >> > > > in
> > >> > my linux
> > >> > > > enviroment :
> > >> > > >
> > >> > > > rbd create veeamrepo --size 20480 rbd --image veeamrepo info
> > >> > > > modprobe rbd rbd map veeamrepo rbd feature disable veeamrepo
> > >> > > > exclusive-lock object-map fast-diff deep-flatten mkdir
> > >> > > > /mnt/veeamrepo mount /dev/rbd0 /mnt/veeamrepo
> > >> > > >
> > >> > > > The comands work fine, but i have one problem, in the moment, i
> > >> > can mount
> > >> > > > the /mnt/veeamrepo in the same time in 2 machines, and this is
> > >> > > > a
> > >> > bad option
> > >> > > > for me in the moment, because this could generate one
> > >> > > > filesystem
> > >> > corrupt.
> > >> > > >
> > >> > > > I need only one machine to be allowed to mount and write at a time.
> > >> > > >
> > >> > > > Example if machine1 mount the /mnt/veeamrepo and machine2 try
> > >> > mount, one
> > >> > > > error would be displayed, show message the machine can not
> > >> > > > mount,
> > >> > because
> > >> > > > the system already mounted in machine1.
> > >> > > >
> > >> > > > Someone, could help-me with this or give some tips, for
> > >> > > > solution my problem. ?
> > >> > > >
> > >> > > > Thanks a lot
> > >> > > >
> > >> > > > _______________________________________________
> > >> > > > ceph-users mailing list
> > >> > > > ceph-users@lists.ceph.com
> > >> > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> > >> > > >
> > >> > > >
> > >> > > >
> > >> > > > You can use Pacemaker to map the rbd and mount the filesystem
> > >> > > > on 1
> > >> > server
> > >> > > > and in case of failure switch to another server.
> > >> > > >
> > >> > > >
> > >> > > > _______________________________________________
> > >> > > > ceph-users mailing list
> > >> > > > ceph-users@lists.ceph.com
> > >> > > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> > >> > > >
> > >> > > >
> > >> > >
> > >> > >
> > >> > > --
> > >> > > Jason
> > >> >
> > >> >
> > >> >
> > >> > _______________________________________________
> > >> > ceph-users mailing list
> > >> > ceph-users@lists.ceph.com
> > >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> > >>
> > >> ----
> > >>
> > >> _______________________________________________
> > >> ceph-users mailing list
> > >> ceph-users@lists.ceph.com
> > >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> > >
> > >
> > > _______________________________________________
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> > > ceph-users@lists.ceph.com
> > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
> > >
> >
> >
> >
> > --
> > Jason
> > _______________________________________________
> > ceph-users mailing list
> > ceph-users@lists.ceph.com
> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com_______________________________________________
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