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Re: [Linux-cluster] GFS Volume Over NFS



Hi Brem,

If Gigi wants to build and storage architecture of "GFS over NFS over
GFS" i would say "this can't be done".

As i said in my previous mail:

"GFS is a filesystem you use over a device or partition. NFS is a file
sharing protocol you use to export an already existing filesystem (EXT2,
EXT3, XFS or GFS itself). When you mount a NFS volume you don't have
access to a device, so you cant use GFS on it when already mounted."

Which is your opinion in this, Brem?

PS: It's not going bad, thanks for asking

Cheers,

Rafael


El dom, 27-09-2009 a las 12:43 +0200, brem belguebli escribió:
> Hi,
> 
> The last sentence seems to mean that Gigi wants to create a GFS on top
> of a NFS FS.
> 
> This GFS will be then exported thru NFS .
> 
> Gigi, is that wjat you want to do ?
> 
> PS: how is it going Rafael ?
> 
> 2009/9/27 Rafael Micó Miranda <rmicmirregs gmail com>:
> > Hi Gigi,
> >
> > El vie, 25-09-2009 a las 19:09 -0500, Mathew, Gigi (JSC-EG)[Jacobs
> > Technology] escribió:
> >> Hi:
> >>
> >>
> >>
> >> I am configuring a Dell EqualLogic iSCSI array in a RHEL 5.3 platform
> >> with two GFS2 volumes with RedHat Cluster Suite using DRAC (primary)
> >> and APC (secondary) fencing devices.  In my cluster configuration I
> >> have DELL Servers (PE R900, PE6800, PE2800, PE1950) Blades (PE M1000,
> >> PE1955, PE1855).  Now I have few workstations (Precision 7500,
> >> Precision 5500,  Precision 690) which I would like to share the above
> >> GFS2 volume over NFS (why?  They are not in the same location and
> >> currently I use NIS/YPBIND/AUTOFS).  Why should I share it? (Because I
> >> have user home directories on this GFS2 volume, which has to seen from
> >> these workstations as they login).  What are the options I have? How
> >> do I achieve it?  I had seen how to share an NFS over GFS, but NOT the
> >> other way. Any suggestion will be greatly appreciated.
> >>
> >>
> >>
> >> Thanks
> >>
> >>
> >>
> >> Gigi Mathew
> >>
> >>
> >> --
> >> Linux-cluster mailing list
> >> Linux-cluster redhat com
> >> https://www.redhat.com/mailman/listinfo/linux-cluster
> >
> > Maybe i'm understanding you wrong, let me explain what i have understood
> > from your explanation:
> >
> > 1.- You have several servers sharing iSCSI volumes from an iSCSI array.
> >
> > 2.- This servers use GFS2 as filesystem on this volumes to share,
> > between themselves, the information in them
> >
> > 3.- You want to make other computers, workstations, get access to this
> > info. They are not in the same location/network so they can not access
> > the iSCSI array by themselves.
> >
> > 4.- You plan to share the iSCSI volumes from the array through a NFS
> > export via the servers which already have access to them, so
> > workstations will get access to the information via NFS.
> >
> > Is this right?
> >
> > If so, you should have a look at this document:
> >
> > http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Configuration_Example_-_NFS_Over_GFS/index.html
> >
> > NFS over GFS2 is, in my opinion, exactly what you need.
> >
> > The other option i think you are thinking about, GFS2 over NFS, cant be
> > done.
> > GFS is a filesystem you use over a device or partition. NFS is a file
> > sharing protocol you use to export an already existing filesystem (EXT2,
> > EXT3, XFS or GFS itself). When you mount a NFS volume you don't have
> > access to a device, so you cant use GFS on it when already mounted.
> >
> > You maybe are thinking in GFS2 over GNDB (global network block device)
> > or GFS2 over DRBD (distributed redundant block device), but i think
> > previous suggestion is simpler than this one. You can also have a look
> > to this approach here:
> >
> > http://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5.4/html/Global_Network_Block_Device/index.html
> >
> > I hope this helps.
> >
> > Cheers,
> >
> > Rafael
> >
> >
> > --
> > Rafael Micó Miranda
> >
> > --
> > Linux-cluster mailing list
> > Linux-cluster redhat com
> > https://www.redhat.com/mailman/listinfo/linux-cluster
> >
> 
> --
> Linux-cluster mailing list
> Linux-cluster redhat com
> https://www.redhat.com/mailman/listinfo/linux-cluster
-- 
Rafael Micó Miranda


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