Hello,

does anybody knows of the DIFFESTIMATE parameter exists in the TdP for
Exchange ? As it exists for TdP for SQL ?

We would like to supress warnog messages we get about too small reservation
of required space for the backups.

Thanks a lot,
                René LAMBELET
                NESTEC  SA
                GLOBE - Global Business Excellence
                Central Support Center
                SD/ESN
                Av. Nestlé 55  CH-1800 Vevey (Switzerland) 
                tél +41 (0)21 924'35'43   fax +41 (0)21 924'45'89   local
REL-5 01
                mailto:rene.lambelet AT nestle DOT com

                This message is intended only for the use of the addressee
                and may contain information that is privileged and
confidential.
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TdP for SQL :

> DIFFESTIMATE 
> Option in the TDPSQL.CFG file. 
> Prior to performing a database backup, the TDP for SQL client must
> 'reserve' the required space in the storage pool. It *should* get the
> estimate right for full backups and transaction log backups because the
> space used in the database and transaction logs is available from SQL
> Server. 
> But: For differential backups, there is no way of knowing how much data is
> to be backed up until the backup is complete. 
> The TDP for SQL client therefore uses the percentage specified in the the
> DIFFESTIMATE option to calculate a figure based on the total space used.
> E.g., for a database of 50GB with a DIFFESTIMATE value of 20, TDP will
> reserve 10Gb (20% of 50GB). 
> A "Server out of data storage space" error will arise if the actual backup
> exceeds the calculated estimate. If the storage pool is not big enough to
> accomodate the larger backup, of if other backup data prevents further
> space being reserved, this error will occur. 
> Setting DIFFESTIMATE to 100 will ensure that there is always sufficient
> space available, but will prevent space in your primary storage pool being
> utilised by other clients and may force the backup to occur to the next
> storage pool in the hierarchy unnecessarily. 
> It is worth setting DIFFESTIMATE to the maximum proportion of the data you
> can envisage ever being backed up during a differential backup.
> 
> 
>       René LAMBELET
>       NESTEC  SA
>       GLOBE - Global Business Excellence
>       Central Support Center
>       SD/ESN
>       Av. Nestlé 55  CH-1800 Vevey (Switzerland) 
>       tél +41 (0)21 924'35'43   fax +41 (0)21 924'45'89   local REL-5 01
>       mailto:rene.lambelet AT nestle DOT com
> 
>       This message is intended only for the use of the addressee
>       and may contain information that is privileged and confidential.
>