From: Andre Noll Date: Mon, 12 May 2008 15:42:14 +0000 (+0200) Subject: Fix the math in the description of the unit interval. X-Git-Tag: v0.1.0~9 X-Git-Url: http://git.tuebingen.mpg.de/?p=dss.git;a=commitdiff_plain;h=8be044b9ea1db7430361d494d6dfe518e4f3240f Fix the math in the description of the unit interval. --- diff --git a/dss.ggo b/dss.ggo index d843906..7892d53 100644 --- a/dss.ggo +++ b/dss.ggo @@ -214,13 +214,14 @@ details=" unit intervals. dss removes any snapshots older than n times u and tries to - keep 2^(k-1) snapshots in interval k, where the interval number - k counts from zero, zero being the most recent unit interval. + 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 + 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. "