X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ian/git?p=chiark-utils.git;a=blobdiff_plain;f=backup%2Fiwjbackup.txt;h=5362fd1343b1978504e54af1d7fdb0599e2d824e;hp=91c904c87ea69eb70aeb602feb4fcb245fc51285;hb=aafd617b49ae360300140a00b4548bbf0284882d;hpb=17fb3a3831ca812a3ad384f4eec3b977432facd9

diff --git a/backup/iwjbackup.txt b/backup/iwjbackup.txt
index 91c904c..5362fd1 100644
--- a/backup/iwjbackup.txt
+++ b/backup/iwjbackup.txt
@@ -15,6 +15,9 @@ brought down to do backups. The defaults are fine.
 settings.pl: generic config file: in particular, the name of the tape
 device is set here.
 
+settings.sh: generic config file for shell scripts.  Currently only
+contains some options for the lvm snapshotter.
+
 tape.*: conventionally, each tape you're going to use in the backup
 cycle has a tape number, a name and a config file.  The tape numbers
 in use at Relativity are digit strings like `512'.  The name is a
@@ -54,18 +57,44 @@ In the fsys.* files:
    run things on a remote machine:
      prefix <prefix-name> <command-part>
   Other lines should be of the form
-    <directory name>   <backup-type>
-  for local backups, or 
-    <directory name>   <backup-type>   <prefix-name>
+    [<device name>:]<directory name> <backup-type>[,<options>]
+  for local backups, or
+    [<device name>:]<directory name> <backup-type>[,<options>] <prefix-name>
   for remote backups.
 The file (including any included files) must end with the word 'end'
 on a line of its own.
 
-Valid values for <backup-type> are `cpio' (uses cpio to produce
-tar-format backups), `dump' (uses dump to dump entire filesystems;
-<directory name> should be a mount-point for this), and `zafio' (uses
-afio to compress each file as it is backed up).  Only `dump' type
-backups perform incremental backups.
+Valid values for <backup-type> are
+  cpio
+    uses cpio to produce tar-format backups
+  dump
+    uses dump to dump entire filesystems
+    <directory name> should be a mount-point
+  gtar
+    uses GNU tar to produce GNU tar format backups and -N-based
+    semi-incrementals (not --incremental or --listed-incremental)
+  zafio
+    uses afio to compress each file as it is backed up
+  ntfsimage
+    for NTFS volumes, requires device name
+Only `dump' and `gtar' type backups perform any kind of incremental
+backups.
+
+<options> is a comma-separated list of <option> or <option>=<value>.
+Options supported:
+
+  gz[i][=<compressionlevel>]
+    Indicates that the whole stream should be compressed with gzip.
+    The compression level defaults to 1 if gz is specified by the
+    level isn't.  gzi appliies only to the incrementals; gz applies to
+    both unless gzi is also specified.  compression level 0 means not
+    to run gzip at all and is the default if gz[i] is not mentioned.
+
+  snap=<snapkind>
+    Indicates that the filesystem should be frozen before the backup
+    by using /etc/chiark-backup/snap/<snapkind>.  See the head comment
+    in /etc/chiark-backup/snap/lvm for details of how this works.
+    When snap= is used, the block device must be specified.
 
 expected-diffs is a config file to indicate which 
 filesystems should *not* be backed up. The scripts do a config
@@ -96,6 +125,10 @@ Useful scripts (all in /usr/bin):
 backup-checkallused: this only does a check of the configuration
 files.  It should give a cryptic summary of the configuration and
 print 'configuration ok'. If not, fix your config files :->
+You have to create the file /var/lib/chiark-backup/last-tape
+containing the id of a tape; this helps backup-checkallused know where
+to start iterating over tapes.  Any tapeid will do.  (But don't make
+it the same as the one you want to back up to first.)
 
 backup-loaded: this tells the scripts that a currently unlabelled tape
 should be treated as tape X: eg: