Date: Thu, 26 May 2011 22:09:21 +0200 (CEST) From: Niclas Zeising <niclas.zeising@gmail.com> To: FreeBSD-gnats-submit@FreeBSD.org Cc: mckusick@FreeBSD.org Subject: docs/157354: [PATCH] update newfs(8) man page after changed defaults Message-ID: <201105262009.p4QK9LUg080794@vincent.daemonic.se> Resent-Message-ID: <201105262010.p4QKA420012306@freefall.freebsd.org>
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>Number: 157354 >Category: docs >Synopsis: [PATCH] update newfs(8) man page after changed defaults >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-doc >State: open >Quarter: >Keywords: >Date-Required: >Class: update >Submitter-Id: current-users >Arrival-Date: Thu May 26 20:10:04 UTC 2011 >Closed-Date: >Last-Modified: >Originator: Niclas Zeising >Release: FreeBSD 8.2-RELEASE amd64 >Organization: >Environment: System: FreeBSD vincent.daemonic.se 8.2-RELEASE FreeBSD 8.2-RELEASE #0: Wed Apr 20 17:22:47 CEST 2011 root@vincent.daemonic.se:/usr/obj/usr/src/sys/VINCENT amd64 >Description: The default sizes for blocksize and fragment size when using newfs was recently changed. Documentation needs to be updated to reflect this. >How-To-Repeat: >Fix: Attached patch updates the manual page to mention the new defaults. --- sbin.newfs.8.diff begins here --- Index: newfs.8 =================================================================== --- newfs.8 (revision 222288) +++ newfs.8 (working copy) @@ -28,7 +28,7 @@ .\" @(#)newfs.8 8.6 (Berkeley) 5/3/95 .\" $FreeBSD$ .\" -.Dd February 22, 2011 +.Dd May 26, 2011 .Dt NEWFS 8 .Os .Sh NAME @@ -112,7 +112,7 @@ The block size of the file system, in bytes. It must be a power of 2. The -default size is 16384 bytes, and the smallest allowable size is 4096 bytes. +default size is 32768 bytes, and the smallest allowable size is 4096 bytes. The optimal block:fragment ratio is 8:1. Other ratios are possible, but are not recommended, and may produce poor results. @@ -143,7 +143,9 @@ .Ar blocksize Ns /8 and .Ar blocksize . -The default is 2048 bytes. +The default is 4096 bytes. +Having a lower size will result in poor performance with modern disks utilizing +4096 byte sectors. .It Fl g Ar avgfilesize The expected average file size for the file system. .It Fl h Ar avgfpdir @@ -279,11 +281,8 @@ .Pa ad3s1a . The .Nm -utility will use a block size of 16384 bytes, a fragment size of 2048 bytes +utility will use a block size of 32768 bytes, a fragment size of 4096 bytes and the largest possible number of blocks per cylinders group. -These values tend to produce better performance for most applications -than the historical defaults -(8192 byte block size and 1024 byte fragment size). This large fragment size may lead to much wasted space on file systems that contain many small files. .Sh SEE ALSO --- sbin.newfs.8.diff ends here --- >Release-Note: >Audit-Trail: >Unformatted:
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