VORBRUGG@DBNPIB5.BITNET (05/26/88)
Here's the output of the DCl command HELP INITIALIZE DEVICE /CLUSTER:
INITIALIZE
Device
/CLUSTER_SIZE
/CLUSTER_SIZE=n
Defines, for disk volumes, the minimum allocation unit, in blocks.
The maximum size you can specify for a volume is one-hundredth the
size of the volume; the minimum size you can specify is calculated
with the formula:
disk size (number of blocks)
---------
255*4096
For Files-11 Structure Level 2 disks, the cluster size default
depends on the disk capacity; disks that are 50,000 blocks or larger
have a default cluster size of 3, while those smaller than 50,000
blocks have a default value of 1.
For Files-11 Structure Level 1 disks the cluster size must always be
1.
As you can see, the minimum follows from the fact that the maximum size
of BITMAP.SYS is 255 blocks (probably a byte sized field somewhere for
historical reasons). So, a cluster=2 disk is allowed up to a 2,088,960
block (slightly less than one gigabyte) disk.
And all that can be found on-line on your VAX/VMS system! Now, who just
said something about reading the <what was that word?> manuals???
Jan Vorbrueggen