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document that default block-size, frag-size, and bytes-per-inode are 

now dependent upon file system size
This commit is contained in:
lukem 2001-12-31 02:27:14 +00:00
parent c64b324a8f
commit 14fb096dce
1 changed files with 40 additions and 6 deletions
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sbin/newfs/newfs.8
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@ -1,4 +1,4 @@
.\" $NetBSD: newfs.8,v 1.37 2001/12/30 16:47:55 lukem Exp $
.\" $NetBSD: newfs.8,v 1.38 2001/12/31 02:27:14 lukem Exp $
.\"
.\" Copyright (c) 1983, 1987, 1991, 1993, 1994
.\" The Regents of the University of California. All rights reserved.
@ -174,7 +174,19 @@ for more details on how to set this option.
.It Fl b Ar block-size
The block size of the file system, in bytes.
It must be a power of two.
The default size is 8192 bytes, and the smallest allowable size is 4096 bytes.
The smallest allowable size is 4096 bytes.
The default size depends upon the size of the file system:
.Pp
.Bl -tag -width "file system size" -compact -offset indent
.It Sy "file system size"
.Ar block-size
.It \&< 20 MB
4 KB
.It \&< 1024 MB
8 KB
.It \&>\&= 1024 MB
16 KB
.El
.It Fl c Ar cpg
The number of cylinders per cylinder group in a file system.
The default is to compute the maximum allowed by the other parameters.
@ -202,23 +214,45 @@ It must be a power of two ranging in value between
.Ar block-size Ns /8
and
.Ar block-size .
The default is 1024 bytes.
The optimal
.Ar block-size Ns : Ns Ar frag-size
ratio is 8:1.
Other ratios are possible, but are not recommended,
and may produce unpredictable results.
The default size depends upon the size of the file system:
.Pp
.Bl -tag -width "file system size" -compact -offset indent
.It Sy "file system size"
.Ar frag-size
.It \&< 20 MB
0.5 KB
.It \&< 1024 MB
1 KB
.It \&>\&= 1024 MB
2 KB
.El
.It Fl g Ar avgfilesize
The expected average file size for the file system.
.It Fl h Ar avgfpdir
The expected average number of files per directory on the file system.
.It Fl i Ar bytes-per-inode
This specifies the density of inodes in the file system.
The default is to create an inode for every
.Pq 4 * Ar frag-size
bytes of data space.
If fewer inodes are desired, a larger number should be used;
to create more inodes a smaller number should be given.
The default is to create an inode for every
.Pq 4 * Ar frag-size
bytes of data space:
.Pp
.Bl -tag -width "file system size" -compact -offset indent
.It Sy "file system size"
.Ar bytes-per-inode
.It \&< 20 MB
2 KB
.It \&< 1024 MB
4 KB
.It \&>\&= 1024 MB
8 KB
.El
.It Fl m Ar free-space
The percentage of space reserved from normal users; the minimum free
space threshold.