Diana,

Each file backed-up requires a database update to record the backup.  If
each file is large the transaction rate is slower than if each file is
small due to the time it takes to send the file to TSM.

The only optimization is to tune the database & logs by spreading the
load across multiple disks (remember not to use a disk for more than one
database or log volume) and tuning the bufferpools to keep the numbers
as close to 100% (database cache hit %) and 0 (log pool % wait).

Steffan

"Diana J.Cline" wrote:
>
> Using an NT Client and an AIX Server
>
> Does anyone have a TECHNICAL reason why I can backup 30GB of 2GB files that 
> are
> stored in one directory so much faster than 30GB of 2kb files that are stored
> in a bunch of directories?
>
> I know that this is the case, I just would like to find out why.  If the 
> amount
> of data is the same and the Network Data Transfer Rate is the same between the
> two backups, why does it take the TSM server so much longer to process the
> files being sent by the larger amount of files in multiple directories?
>
> I sure would like to have the answer to this.  We are trying to complete an
> incremental backup an NT Server with about 3 million small objects (according
> to TSM) in many, many folders and it can't even get done in 12 hours.  The
> actual amount of data transferred is only about 7GB per night.  We have other
> backups that can complete 50GB in 5 hours but they are in one directory and 
> the
> # of files is smaller.
>
> Thanks
>
>  Network data transfer rate
>  --------------------------
>  The average rate at which the network transfers data between
>  the TSM client and the TSM server, calculated by dividing the
>  total number of bytes transferred by the time to transfer the
>  data over the network. The time it takes for TSM to process
>  objects is not included in the network transfer rate. Therefore,
>  the network transfer rate is higher than the aggregate transfer
>  rate.
> .
>  Aggregate data transfer rate
>  ----------------------------
>  The average rate at which TSM and the network transfer data
>  between the TSM client and the TSM server, calculated by
>  dividing the total number of bytes transferred by the time
>  that elapses from the beginning to the end of the process.
>  Both TSM processing and network time are included in the
>  aggregate transfer rate. Therefore, the aggregate transfer
>  rate is lower than the network transfer rate.

--
=========================================================================