From: Butler, Mathew (ButlerGM@logica.com)
Date: Wed Oct 09 2002 - 20:30:52 EDT
Thanks to the following who responded with information, requests for
a summary and offers of professional advise/quotes:
Selden E Ball Jr, Benjamin Ingwersen, Richard Mollel, Pat O'Brien,
Chris Eubank and David Munroe for taking the tiem to respond to a few emails
and provide some additioanl info.
The storage Page:
http://thenew.hp.com/country/us/eng/prodserv/storage.html
Tape Library Recomendations:
- ESL9198DLX
http://www.compaq.com/products/quickspecs/10730_ca/10730_ca.HTML (may not be
supportsed on AS4100)
- TL895
http://www.compaq.com/products/quickspecs/10243_div/10243_div.HTML
(specifies tru64 V4.0D)
- ESL9326SL
http://www.compaq.com/products/storageworks/esl9326sl/description.html
- MSL5026SL
http://www.compaq.com/products/storageworks/msl5026/description.html
Management Software
- Legato
- Veritas
- Storetek
- BakBone
Comments:
"Use Multiple streams for Backup"
"Backing up and restoring 0.5TB to a tape library is easily done
using the latest tape technologies (SDLT, LTO, etc.).
A tape library with two LTO drives will back up over 0.5TB,
uncompressed, in 6 hours."
Conclusion:
The ESL libraries seem a little too powerful for what I am looking
to achieve. I am focusing on the TL895 and MSL5026SL. Most likely making a
recommendation to use the MSL5026SL (since is uses later technology and is
more easily upgradeable). I discovered that compressing the data may
increase the speed of the backup and restore and that I need to look in more
detail at the management software as this is really how I can take advantage
of using multiple tape drives in parallel and get the best out of the
library.
Oh, and most importantly the speed of the backup (obviously) depends on how
fast the data can be pulled off disk. To estimate this throughput it was
suggested to do a:
# time cp -R /test /dev/null
For a similar amount of data (ie roughly 500Gb)
QUESTION
===========
> I've decided to review our backup and recovery process and am looking for
> some help...
>
> My requirements are:
>
> 1) Must be able to backup/recover 0.5 TB of data in less than 6 hours.
> 2) Must be scaleable up to 1.0 TB of data to be backed up/recovered in
> less then 6 hours.
> 3) Must be future proof (the next 3-5 years)
>
> Are these figures achievable? Can they be improved upon?
> What management software would be recommended?
> Are there any specific configurations that might speed up our existing
> tape drives (larger block size etc)?
>
> Currently using an Alphaserver 4100 (4cpu), Tru64 5.1 and RAID (HSZ450
> (?))
>
> Thanks in advance.
>
> Mat.
> Mathew Butler
> E-Mail: butlergm@logica.com
>
>
>
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