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1986-03-04
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Date: 18 November 1985 Number 117
Title: Maximum Directory Sizes for all NetWare Systems
It has been discovered that there is a maximum directory size
limitation. This limitation MUST not be violated or serious problems
can arise. The problem is clearly evident when running the streaming
tape backup/restore on NetWare/68products. When a drive is set up
with too many directory blocks, the configurationinformation overruns
a sector boundary. This overflow is not recognized during the
NetWare/S backup procedure. Without this necessary information
backed up, it is impossible to rebuild the directory structure should a
restoration become necessary. Novell is currently modifying the
"SYSGEN.I", "SYSED.I" and"INSTALL.EXE" to automatically calculate
the maximum amount of directory entries allowed on a given drive.
Until these are available, the following formula shouldbe used in
computing directory sizes. This formula applies to all NetWare
systemsversion 4.0 and greater.
X=255-(A/4)-(B*6)
X=Total number of directory blocks allowed on each physical
drive, all
volumes combined.
A=Disk drive formatted capacity in megabytes.
B=Number of volumes configured on a drive.
Note that it is advisable to limit volumes to one volume per drive
whenever possible. You should never configure your system with
more directory entries than needed. Every entry requires forty bytes
in memory for hashing and caching whether or not it is being used.
If you have exceeded the limit given by the above equation do
not attempt to run "RESTORE" until the newer verison comes out. If
you decide to re-install NetWare using any option that re-builds the
directories (option 1 of the INSTALL program with NetWare/86 or
SYSGEN with NetWare/68), you must first re-build the badblock table
using COMPSURF. Do not preserve the existing bad block table. You
must re-enter the bad block list using the media defect list provided
by the drive manufacturer.
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