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Snapshot files are set with the "snapshot" file flag during creation by

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mksnap_ffs(8) or mount(8).  The previous statement was incorrect since
it mentions the immutable flag, i.e. "noschg" which is not the case when
one does "ls -lo" in a directory containing snapshot files.

While I am here, mention a way for finding snapshot files on a file
system.

PR: 	docs/80535 (inspired by)
This commit is contained in:
Hiten Pandya 2005-06-16 04:46:15 +00:00
parent e3f9e93d33
commit 1c58896a25
Notes: svn2git 2020-12-08 03:00:23 +00:00 
svn path=/head/; revision=24884
1 changed files with 7 additions and 5 deletions
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12
en_US.ISO8859-1/books/handbook/disks/chapter.sgml
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@ -3141,12 +3141,10 @@ Filesystem 1K-blocks Used Avail Capacity Mounted on
however all the used space may not be acquired because another snapshot will however all the used space may not be acquired because another snapshot will
possibly claim some of the released blocks.</para> possibly claim some of the released blocks.</para>
<para>During initial creation, the <option>schg</option> flag (see the &man.chflags.1; manual page) <para>The un-alterable <option>snapshot</option> file flag is set
is set to ensure that even <username>root</username> cannot write to the snapshot. by &man.mksnap.ffs.8; after initial creation of a snapshot file.
The &man.unlink.1; command makes an exception for snapshot files The &man.unlink.1; command makes an exception for snapshot files
since it allows them to be removed since it allows them to be removed.</para>
with the <option>schg</option> flag set, so it is not necessary to
clear the <option>schg</option> flag before removing a snapshot file.</para>
<para>Snapshots are created with the &man.mount.8; command. To place <para>Snapshots are created with the &man.mount.8; command. To place
a snapshot of <filename>/var</filename> in the file a snapshot of <filename>/var</filename> in the file
@ -3159,6 +3157,10 @@ Filesystem 1K-blocks Used Avail Capacity Mounted on
a snapshot:</para> a snapshot:</para>
<screen>&prompt.root; <userinput>mksnap_ffs /var /var/snapshot/snap</userinput></screen> <screen>&prompt.root; <userinput>mksnap_ffs /var /var/snapshot/snap</userinput></screen>
<para>One can find snapshot files on a file system (e.g. <filename>/var</filename>)
by using the &man.find.1; command:
<screen>&prompt.root; <userinput>find /var -flags snapshot</userinput></screen>
<para>Once a snapshot has been created, it has several <para>Once a snapshot has been created, it has several
uses:</para> uses:</para>