X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;ds=inline;f=dss.ggo;h=5b78ddaa5724e8f6e5ef015613aefb38acf0efdc;hb=4a8f63a0c7bfc1f92bda9d9e882d0f00cc50e79b;hp=68b7a7aded9250e56e2216e8c21ea391565dec53;hpb=239ef107365b1120979a82ac4b652e1c5a220220;p=dss.git

diff --git a/dss.ggo b/dss.ggo
index 68b7a7a..5b78dda 100644
--- a/dss.ggo
+++ b/dss.ggo
@@ -275,22 +275,21 @@ int typestr="days"
 default="4"
 optional
 details="
-	dss snapshot aging is implemented in terms of intervals. There
-	are two command line options related to intervals: the
-	duration u of a \"unit\" interval and the number n of those
-	unit intervals.
-
-	dss removes any snapshots older than n times u and tries to
-	keep 2^(n - k - 1) snapshots in interval k, where the interval
-	number k counts from zero, zero being the most recent unit
-	interval.
-
-	In other words, the oldest snapshot will at most be u * n days
-	(= 20 days if default values are used) old.  Moreover, there
-	are at most 2^n - 1 snapshots in total (i. e. 31 by default).
-	Observe that you have to create at least 2^(n - 1) snapshots
-	each interval for this to work out because that is the number
-	of snapshots in interval zero.
+	Snapshot aging is implemented in terms of intervals. There are two
+	command line options related to intervals: the duration u of a unit
+	interval and the number of unit intervals, denoted n below.
+
+	dss removes snapshots older than n times u and tries to keep 2^(n -
+	k - 1) snapshots in interval k, where the interval number k counts
+	from zero to n - 1, with zero being the most recent unit interval.
+
+	Hence the oldest snapshot will at most be u * n days old (4 days *
+	5 intervals = 20 days, if default values are used). Moreover, there
+	are at most 2^n - 1 snapshots in total (2^5 - 1 = 31 by default). Note
+	that for this to work out your system must be fast enough to create at
+	least 2^(n - 1) snapshots per unit interval (16 snapshots in 4 days =
+	one snapshot in 6 hours), because this is the number of snapshots in
+	interval zero.
 "
 
 option "num-intervals" n
@@ -299,6 +298,10 @@ option "num-intervals" n
 int typestr="num"
 default="5"
 optional
+details="
+	Note that increasing this number by one doubles the total number of
+	snapshots. See the documentation of --unit-interval above.
+"
 
 ###############
 section "Hooks"
@@ -451,13 +454,10 @@ option "keep-redundant" k
 "Prune by disk space only"
 flag off
 details="
-	If this flag is not given dss removes redundant and outdated
-	snapshots automatically.
-
-	Otherwise, this feature is deactivated so that snapshots are
-	only being removed in case disk space or number of free inodes
-	becomes low. Use this flag if the file system containing the
-	destination directory is used for snapshots only.
+	By default, redundant and outdated snapshots are removed automatically
+	to keep the number of snapshots in harmony with the configured
+	policy. If this flag is given, dss removes such snapshots only if
+	disk space or number of free inodes becomes low.
 "
 
 option "min-complete" -