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13329 - Disk requirments during OS/DB migtation
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Disk requirments during OS/DB migtation
At 09:40 AM 3/12/2004, you wrote:>We will migrate our 46B R3 system from AS400 to Intel on SQL server
>at the end of 2004.
>
>I am trying to work out my disk requirments on the source system
>during the migration (for export files) based on current disk used
>and expected growth from now to the migration date. At that time I
>expect the databse to be approx 425GB.
>
>The R/3 Heterogeneous System copy manual (section 4-2 Requirements
>and Restrictions)for 46B says that I need at least free disk equal to
>the size of the database. If this is true I will need to do a disk
>upgrade before the migration.
>
>I am also told by several sources that the export files during the
>migration are compressed. If this is so why do I need disk equal to
>the database size?.
>
>Can anyone share there experience or knowledege of how best to
>calculate the disk requirments.
The files are not "compressed" persay but they are smaller in total
than the size of the database. First off you don't include indexes in
the calcuations so that cuts size down by roughly 1/2, then the flat files
are as a rule somewhat smaller as there's simply less overhead.
Someone has suggested 1/10 the size, that is too aggressive. Without
diving into my notes I know that I did an Oracle database one a while
ago that had 350GB of allocated space of which 280-320GB was
actual data and indexes. The resulting export files where 85GB so that's
about 1/4 or slightly better. Your milage will vary, it depends heavily on
exactly
what kind of data you have.
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