Thanks James! With your help I realise that SAP kernel on Windows uses mkszip and on Linux uses gzip.
Compression command looks like :
Windows: compress_cmd = "mkszip -c $ > $"
Linux: compress_cmd = "gzip -c $ > $"
Gzip default compression level is 6,
-# --fast --best<br>Regulate the speed of compression using the specified digit #, where -1 or --fast indi‐ cates the fastest compression method (less compression) and -9 or --best indicates the slowest compression method (best compression). The default compression level is -6 (that is, biased towards high compression at expense of speed).
and mkszip default compression is 9
<em><strong>-l</strong> comp_level<i>sets the level of compression to comp_level. Higher values lead to greater compression but result in more time taken during the compression process. The value comp_level may be an integer from 0 to 9. <strong>The default is 9</strong>.</i></em><i></i>
So the problem was in default level of compression which SAP do not manage. Now I am trying to find the optimal compression level.
Hi Igor,
The backup time is mainly depending on size, hardware/i/o, since you have different OS, so I assume this could be a proper different reason.
You may check from OS or I/O point of view.
Best regards,
James
Hi Igor,
Then please perform testing:
1. put a big file to oracle data file directory
2. use cp or os command to manually move the testing file
3. then please check whether the speed is the same from both the system
By doing this, we can roughly knows the pure OS speed to back up.
Best regards,
James
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