Scott F. Woods
Peter L. Wargo
Brooke King 6532
Special thanks to:
The general consensus was to get a DLT7000 drive. They store 35G native
and 70G compressed, and they can write at up to 5MB/sec. Most people
suggested getting Legato, however, some people suggested a free backup
package called AMANDA that uses ufsdump. AMANDA can be found at:
http://www.cs.umd.edu/projects/amanda/ There was a mentioned of a
package called Budtool at http://www.iguard.com/products/btdata1.html.
I am going with the DLT7000 drive for several reasons. First it is
supported by my SUN Maintanance Agreement. Second, I get a 28% discount
from ITOCHU in New York for the part ($10,400 retail; $7,488.00 discount
+ $45 for cables). As for software, I am going to go with AMANDA (is
ps. I included only a few of the responses. Thanks to all the prompt
A DLT7000 will store 35 gig native and 70 gig compressed on a
single tape and I believe it writes at about 6megByte/s. We have a
DLT4000 which stores 20 gig native and 40 gig compressed and it has
worked flawlessly so far (much better than the 8505xl stacker we
The tapes are expensive (about $100 a tape), but it is much
faster and higher density than 8mm.
I think you get get a single DLT7000 drive for about $5,000.
| Scott Woods phone: 770-497-2948
| CAD Engineer email: firstname.lastname@example.org
If you can stop your Oracle database for a short time, this is
what we use to do. It provided for a safe Oracle backup that could
be done with regular Unix tools and / or bare bones SolsticeBackup.
You will need extra disk space of course. So I guess it's pay up one
way or the other.
As for your management, ask them what the cost would be if the
system was down for 2 days while it was being recovered. Can they
afford that? Tally up the lost productivity, sales, face, etc...
Often the equipment pays for itself the first time it's used to
recover. Get their decision in writing !
1- Stop / shutdown Oracle
2- Do a cold Oracle backup i.e. copy all your Oracle files,
to a scratch filesystem, FS2. You can likely pipe it
through your favorite compression utility to save disk space.
3- Restart Oracle
4- Backup the rest of the system (excluding your Oracle stuff
copied) and FS2 with whatever tool you want.
The Exabyte Mammoth drives are in the 40GB capacity range. They
can also read your current 8mm tapes.
Consider fast/wide SCSI for the tape unit if you don't have it
You're looking to back up at least 10GB per hour; are you
sure you want to insist on one tape? A tape jukebox would cost
quite a bit, but how about a stack of 2 or 4 drives that you load by
hand once a day?
The advantage to this approach is having all tapes running at
the same time; if you back up disks on separate controllers
simultaneously, you'll get the most bang for your buck.
Also, if you have to restore a lot of files, how long will it
take you to search through 1 80GB tape as opposed to (say) 4 smaller
Do you have to use 8-mm tapes? They take up over twice as
much storage volume as a 4-mm tape (I measured). Sun sells FlexiPack
units of multiple 4-mm DDS-2 drives; we use them for our backups and
they work like a champ. One tape holds 8 GB using ufsdump; 10 of
those running in parallel and you'll have your backups done in under
Are you backing up database files (Oracle, Sybase, etc)? We
have Oracle, and we were able to reduce a 750-Mbyte dump to 70-Mb
by compressing the DB files to a different filesystem before
ASC/YCOA, Wright-Patterson AFB, OH 45433, USA
I don't know $ pricing but you should look at the DLT units. The
DLT7000 does 35GB (uncompressed) onto one tape and if my DLT4000 (20GB
uncompressed) and data is anything to judge it by I get at least 2.5:1
compression (ie 50GB+). You can fit these into jukebox units a a later
date of which the smallest I have seen is 7 tapes. Sun resell DLT units
(atleast they do in the UK).
You might also want to look at some backup software called
Budtool from Intelligaurd software. It uses standard backup commands so
you only by the server software and you do not need licenses for clients
like with Networker. It will also backup Oracle databases etc. You can
find details on this product at
I have been using Budtool and my DLT unit to backup ~74GB of
data since August last year without a single problem that wasn't user
error and at an average of 1.7MB per second (takes less than 12 hours
for a full backup) with the Budturbo optional software loaded on my main
Ian Camm Tel: +44 1256 388711
Principal Systems Administrator Fax: +44 1256 388703
Sony Semiconductor Europe Email:
The Crescent, Jays Close
RG22 4DE, UK
Just 2 cents worth for your consideration-
For years & on almost every job, I've been faced
with a similar problem; too much disk capacity &
not enough tape capacity or hours in the night.
1) get a "BIG" disk that is nothing more than a collector
for incremental backups. The incremental backups
run nightly disk-to-disk. During the day ufsdump
this volume to tape & deleted all container files.
2) Get enough tape capacity such that you do a full backup
on 20% of your disk storage a night. Over the course
of a week, each volume get a full level 0 dump. You
load up a tape before departing & let cron run the
backups while you are sleeping.
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