Extract from the NetBackup help file:

        The high water mark does not apply to storage units that are used for 
basic disk staging. For more information about this type of disk staging, see 
Basic disk staging limitations.

Best Regards,
Bart WALLEBROEK
Backup admin
Enterprise Applications Delivery - Infrastructure Management
S.W.I.F.T. SCRL

>-----Original Message-----
>From: Girish Jorapurkar [mailto:girishsj AT yahoo DOT com]
>Sent: Thursday, July 16, 2009 3:07 PM
>To: WALLEBROEK Bart; Martin, Jonathan; veritas-bu AT mailman.eng.auburn DOT edu
>Subject: Re: [Veritas-bu] Media Server offline for disk
>
>
>There you go - setting a lower value to RE_READ_INTERVAL, I belive, is the 
>problem. NetBackup will mark a media
>server "offline for disk" if does not receive heartbeat in 30 seconds, in your 
>case. And, that applies to all media
>servers - which can be hard to meet in a very busy system/time. So, I suggest 
>that you revert RE_READ_INTERVAL to
>default (5 mins = 300 seconds)
>
>To address your original concern, you should be able to change/configure 
>high-water mark (upper threshold) for a
>BasicDisk STU using GUI/CLI.
>
>/Girish
>
>
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