[Info-vax] BACKUP/INIT

[jbriggs444]

On Feb 18, 4:51 am, hel... at astro.multiCLOTHESvax.de (Phillip Helbig---
undress to reply) wrote:
> I just did INIT/SYS several times on a 1-GB disk (RZ26L).  I kept
> getting a cluster size of 16, even though I didn't specify this.  This
> is with VMS 7.3-2.
>
> In the old days, I never specified cluster size.  With 1-GB disks, I
> always got 3.  According to HELP BACK/INIT, I should get this since it
> is larger than what is otherwise used as the default.  Why in the world
> should I get 16?  It's not even a default in any situation.  I just had
> INIT/SYS/HEADERS=50000, nothing else.

In the old days my recollection is that there was a hard limit on the
size of bitmap.sys and, as a result, the number of allocation clusters
on the volume had a hard cap.  Make the volume big enough and
the default cluster size of 3 is inadequate to allow bitmap.sys to
cover
the whole volume.

INITIALIZE was aware of this and would bump up the cluster factor
for large volumes.