| bellard | c101c49 | 2004-03-26 22:42:54 +0000 | [diff] [blame] | 1 | .\" $Header: /home/paul/qemu/svnmerge/qemu-cvs/qemu/qemu-mkcow.1,v 1.1 2004-03-26 22:42:54 bellard Exp $ |
| 2 | .\" |
| 3 | .\" transcript compatibility for postscript use. |
| 4 | .\" |
| 5 | .\" synopsis: .P! <file.ps> |
| 6 | .\" |
| 7 | .de P! |
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| 52 | '\" t |
| 53 | .ta 8n 16n 24n 32n 40n 48n 56n 64n 72n |
| 54 | .TH "QEMU" "8" |
| 55 | .SH "NAME" |
| 56 | qemu-mkcow \(em create a copy-on-write file for qemu |
| 57 | .SH "SYNOPSIS" |
| 58 | .PP |
| 59 | \fBqemu-mkcow\fR [\fB-h\fP] [\fB-f \fImaster_disk_image\fR\fP] [\fIcow_image\fR] [\fB\fIcow_size\fR\fP] |
| 60 | .SH "DESCRIPTION" |
| 61 | .PP |
| 62 | The \fBqemu-mkcow\fR command creates a |
| 63 | persistent copy-on-write file for \fBqemu\fR. |
| 64 | |
| 65 | .PP |
| 66 | \fBqemu\fR can be used in a "copy-on-write" mode, |
| 67 | where changes made by \fBqemu\fR do not actually |
| 68 | change the disk image file. One way is to invoke |
| 69 | \fBqemu\fR with -snapshot: these changes |
| 70 | are stored in a temporary file, which is discarded when |
| 71 | \fBqemu\fR exits. |
| 72 | |
| 73 | .PP |
| 74 | \fBqemu-mkcow\fR creates an explicit copy-on-write |
| 75 | file where changes are to be stored: this way, changes made |
| 76 | inside \fBqemu\fR will still be there next time you |
| 77 | run it, although the master disk image isn't ever changed. |
| 78 | |
| 79 | .PP |
| 80 | The usual method is to create the master image, then create a |
| 81 | copy-on-write file using \fBqemu-mkcow\fR with |
| 82 | \fB-f\fP. The filename of the master image is stored |
| 83 | inside the generated copy-on-write file: it must not be modified |
| 84 | after this is run! |
| 85 | |
| 86 | .PP |
| 87 | If no master file is specified, the effect is that of a |
| 88 | blank master of size \fIcow_size\fR. |
| 89 | |
| 90 | .SH "SEE ALSO" |
| 91 | .PP |
| 92 | qemu(1), qemu-fast(1). |
| 93 | .SH "AUTHOR" |
| 94 | .PP |
| 95 | This manual page was written by Paul Russell prussell@debian.org for |
| 96 | the \fBDebian\fP system (but may be used by others). Permission is |
| 97 | granted to copy, distribute and/or modify this document under |
| 98 | the terms of the GNU General Public License, Version 2 any |
| 99 | later version published by the Free Software Foundation. |
| 100 | |
| 101 | .PP |
| 102 | On Debian systems, the complete text of the GNU General Public |
| 103 | License can be found in /usr/share/common-licenses/GPL. |
| 104 | |
| 105 | .\" created by instant / docbook-to-man, Fri 12 Mar 2004, 05:58 |
