From: Oded Maimon <oded.maimon@gmail.com>
Subject: Re: NFS High Availability Cluster
Date: Tue, 14 Jun 2005 00:53:15 +0200
Message-ID: <42AE0E5B.8090903@gmail.com>
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To: Dan Stromberg <strombrg@dcs.nac.uci.edu>
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Yes, you are right, i will have to use something like GFS on the NFS 
servers.


Dan Stromberg wrote:

>I've only heard of doing this with readonly data, but that's probably
>because multiple systems with the same "local filesystem" (in the SAN
>sense) is becoming more common recently.
>
>If your SAN solution will resolve any concurrent-access problems you
>might have otherwise with multiple systems accessing the same filesystem
>blocks via the SAN, then you likely could have autofs do failover for
>readwrite (unless the automounter were arbitrarily restricted).
>
>But to get this, it's entirely possible that you would have to use a
>special filesystem that is designed to handle multiple, "local",
>concurrent writers and readers, since to the OS, SAN blocks look a lot
>like local disk blocks, and you can't have two filesystems trying to
>access the same disk blocks concurrently, normally - otherwise, without
>automatic updates, you could end up with a corrupted filesystem.
>
>On Mon, 2005-06-13 at 22:13 +0200, Oded Maimon wrote:
>  
>
>>Hi,
>>
>>I'm looking for a solution that will not make me reboot or even remount 
>>the file system (unless the remount is autmatically)...
>>
>>
>>what the reason that the automounter will do this only for read only data?
>>
>>
>>Thanks,
>>
>>Oded.
>>
>>
>>Dan Stromberg wrote:
>>
>>    
>>
>>>I'm told that the current generation of automounter should be able to
>>>failover readonly versions of the same data.
>>>
>>>What we've been doing so far with linux, though, is to have a script
>>>that, instead of using fstab, instead traceroute's each of the replica
>>>servers and statically NFS mounts from the one that is up, and shows the
>>>lowest number of router hops.
>>>
>>>The autofs failover should obviate reboots, at least to some extent.
>>>
>>>The script I've described, which I'd be happy to share, makes it so
>>>endusers can just reboot to come up mounting from a different replica.
>>>
>>>On Mon, 2005-06-13 at 11:55 +0200, Oded Maimon wrote:
>>> 
>>>
>>>      
>>>
>>>>Hi,
>>>>
>>>>Is it possible to set an NFS HA cluster?
>>>>
>>>>That means, that several servers will share the same disks in a SAN and 
>>>>will provide an NFS service for
>>>>
>>>>all my other servers?
>>>>
>>>>
>>>>I need that when one NFS server will fail (or the network connection to 
>>>>it)  then no server using the NFS will be affected and will continue to
>>>>
>>>>work with one of the other NFS servers.
>>>>
>>>>
>>>>Is it possible?
>>>>
>>>>
>>>>Thanks,
>>>>
>>>>Oded.
>>>>
>>>>
>>>>
>>>>
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>>>>   
>>>>
>>>>        
>>>>


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