Re: Load balancing for NFS server?

To: <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: Load balancing for NFS server?
From: "Dinesh" <dksiwal@xxxxxxxxxx>
Date: Mon, 27 Aug 2001 05:32:45 +0530
Dear Kjetil ,
Its ok if the server gives read only access , since i want the file server
to be just be able to  give read access of files to the server. If this is
taken into consideration then is it possible to failover and load balance an
NFS server ??

Thanks and reagrds

----- Original Message -----
From: "Kjetil Torgrim Homme" <kjetilho@xxxxxxxxx>
To: <lvs-users@xxxxxxxxxxxxxxxxxxxxxx>
Sent: Monday, August 27, 2001 5:23 AM
Subject: Re: Load balancing for NFS server?

> "Dinesh" <dksiwal@xxxxxxxxxx> writes:
> >  Is there any facility available for load-balancing and failover for
> >  NFS file server ??
> This is hard.  Generally, the device and inode number are used as keys
> for selecting the right file on the server.  It is awkward to keep
> _exact_ copies of the filesystem on two different servers.  You'd also
> be limited to read only access.
> Anything more advanced needs explicit NFS support in LVS (i.e. send
> writes to all realservers, but load balance reads), and probably
> kernel support on the realservers to keep the cookies in sync.
> Failover NFS usually entails two servers sharing a SCSI bus, but only
> one server using it at a time (== custom hardware).  When a server
> fails, the other assumes its IP address and starts using the disks.
> Kjetil T.
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