Which filesystem can I use to access a shared Rackstorage (Raid Array)

[Tom Samplonius]

On Wed, 2 Jul 2003, Etienne Ledoux wrote:

> Greetings,
> 
> I finally got my netservers up and running. I can mount the rackstorage 
> (shared Raid Array) from both. But as expected if I add/delete something on 
> the one server the other one doesn't see it untill I reboot it and remount 
> the share. Just an umount/remount doesn't pick up the change either.

  BTW, that probably damamged your filesystem, and you should probably
force a fsck.  UFS assumes exclusive access, and if another system is
modifying the same structures, they will write all over each other.  

  When you umount and mount on the one system, it doesn't see the changes,
because it assumes nothing has changed since the last time it had the disk
mounted.

> This being a nice setup I would like to be able to access (add/delete) at the 
> same time from both servers. Which filesystem available for FreeBSD can I use 
> to do this ?

  Well, it would require a filesystem that would establish a lock with its
peer before updating anything.  I'm not aware of too many filesystems that
can do this.

> Alternitavily, how can a remount the parition without having to reboot to be 
> able to see all the new data. This will enable me to sort off use the second 
> server as a standby.

  Just never mount the filesystem on two systems at once.  Unmount on one,
and then mount on the other.  Basically, treat it as pseudo removable
disk.  

> e.
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