It is possible that automated processes will write to the underlying fs when 
the mount falls off, yes. Not likely, but possible. And the mount WILL fall of 
sometimes.

The main problem with NAS/NFS in a mission-critical environment is that hard 
mounts will hang the server if the file server goes away, and soft mounts WILL 
cause loss of data over time. Evan Marcus has a good detailed explaination of 
this in his 'blueprints' slide show and talk, unknown if it's in the book.

Another problem, especially in networks of our size, is that a network anomoly 
puts your server out of business for the above reasons. If you're doing a 
database backup, or other localized backup, and a junior admin puts a device on 
your network with the same IP as the NAS server, you're either hung, or writing 
holes in your files until it's fixed...

JF

On Tue, Mar 13, 2001 at 01:16:46PM -0600, Price, Michael spake unto the 
multitudes:
>       We recently put ours on NAS.  I'd love to know if anyone has any
> insight or experiences on that, especially using EMC.
> 
>       At Veritas training, I asked about NFS and they said it was a bad
> idea because a problem with the mount may result to writing locally and then
> not being able to sync.  But I wish i had explained that I was thinking of
> NAS.  Our NAS is EMC.
> 
>       Any comments appreciated.
> 
> -----Original Message-----
> From: Karamchedu, Rajeev K. [mailto:rajeev AT tigr DOT org]
> Sent: Tuesday, March 13, 2001 1:02 PM
> To: Veritas-Bu (E-mail)
> Subject: [Veritas-bu] Netbackup DB Catalog File Paths
> 
> 
> Hello
> 
> 
> Have you had any experiences with storing NB Catalogs
> on an NFS Filesystems ? I am trying to find out if they
> are problematic. Our netbackup catalog size is ever
> increasing due to our increasing backup tasks
> and I am thinking of throwing a part of it on a Netapp
> filer so that I can grow it on demand..
> 
> (or I could add an internal disk, but that's only migrating
> the problem to a future time...)
> 
> I appreciate your inputs.
> 
> Thanks
> 
> Rajeev
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu

-- 
"The secret of success is constancy to purpose." - Disraeli
Joshua Fielden - Manager, Portal Backups
eXcite@Home, Inc. jfielden AT excitecorp DOT com 650-556-3316