[Info-vax] Expansion Size Limit

abrsvc dansabrservices at yahoo.com
Mon Feb 7 13:23:46 EST 2011


On Feb 7, 10:08 am, Fekko Stubbe <fekko.stu... at kadaster.nl> wrote:
> This is probably the difference between the EOF  and  the allocated
> size of bitmap.sys (*256*8*clustersize)
> Fekko

The expansion limit is defaulted using a formula shown in the Volume
Shadowing manual.  WIth "older" ODS-2 units, the size limit for the
BITMAP.SYS file was 256 blocks, so the expansion limit is set by
that.  The numbers don't work out exactly, but with a local disk here,
I get an expansion limit of HEX:11A6000 (18505728) for a 9GB disk.
This works out to be 251*4096*18 with the 251 being the allocated size
ofhte bitmap file (actually 252), 4096 being the constant listed in
the manual and 18 being the current cluster size.

Hope this helps,
Dan



More information about the Info-vax mailing list