Thomas

we don't use caching on our diskpools.
I know we should direct SAPbackups to tape ... and for our bigger systems we
do  ...

you wrote:
"Your FS backup gives you the network data transfer rate, whereas the
DB backup gives you a number including network data transfer rate, 
tape mount/unmount times etc. "

then fs backups is by default faster than db backups assuming one uses same
network and disk (in stead of tape) ?


-----Original Message-----
From: Rupp Thomas (Illwerke) [mailto:thomas.rupp AT ILLWERKE DOT AT]
Sent: donderdag 13 maart 2003 10:40
To: ADSM-L AT VM.MARIST DOT EDU
Subject: AW: fs backup versus database backup


Hi Ruud,

in the ADSM-L archives you will find a thread about backing up to disk or
tape.
The recommandation was to backup SAP R/3 directly to tape because you could
use more drives, keep the tapes streaming and avoid disk latency. 
See thread: "Backup faster to tape than disk"

Do you use caching on your disk storagepools?

Kind regards
Thomas Rupp
Vorarlberger Illwerke AG

-----Ursprüngliche Nachricht-----
Von: Van Ruler, Ruud R SITI-ITDGE41 [mailto:ruud.vanruler AT SHELL DOT COM] 
Gesendet: Mittwoch, 12. März 2003 18:16
An: ADSM-L AT VM.MARIST DOT EDU
Betreff: fs backup versus database backup


Hi

FS backup:
 Network data transfer rate:        56,265.13 KB/sec i.e. 56Mb/sec
starttime 02:30 endtime 02:55
ANE4961I (Session: 4073, Node: RYSAP380)  Total number of
                       bytes transferred:   396.77 MB


Database backup:
BKI1215I: Average transmission rate was 97.247 GB/h (27.661 MB/sec).
starttime 20:00  endtime 23:40
BR061I 471 files found for backup, total size 360069.555 MB

Both backups go over Gb links
Why FS backup faster than DB backup , i would expect the other way around ??


Ruud van Ruler, Shell Information Technology International B.V.   - DSES-7
SAP R/3 Alliance Technical Support
ITDSES-6 Technical Information and Links page: http://pat0006/shell.htm
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Dokter van Zeelandstraat 1, 2285 BD Leidschendam NL
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Email Internet: ruud.vanruler AT shell DOT com
                        rvanruler AT hotmail DOT com