Is your DLT7000 directly attached to your master server? And
are you doing streaming? You can split up the directories under
the same file system and each directory will split up as
one stream. You could also split the files up by drives
to make your reads more efficient. Streaming will be more efficient
and reduce the wear and tear on your tape drive.


Sonny Chee
System Administration
Winstar Communication

> -----Original Message-----
> From: veritas-bu-admin AT Eng.Auburn DOT EDU
> [mailto:veritas-bu-admin AT Eng.Auburn DOT EDU]On Behalf Of George Roper
> Sent: Tuesday, May 16, 2000 7:51 AM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] Lots of files: Backup Performance
>
>
> How does NBU perform when asked to backup a lot of small files within the
> same filesystem?
>
> I have need to backup 1,600,000 files averaging 2-3k each - total
> of 30GB of
> data. My backup to a single DLT7000 tape unit currently takes ~50 hours.
>
> Theorectically if the system were able to drive the DLT at 5MB/s
> this should
> take 100 minutes. NBU obviously has lots of overhead when
> recording to the
> Files Database each of these 1,600,000 files. Also the backup
> process must
> slow when walking the directory to determine what file to backup next.
>
> Before I start tuning this environment I would like to know what is a
> reasonable backup window to expect.
>
> Anyone any experience or observations?
>
> George
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