Package: rrdtool Version: 1.3.1-4 Severity: grave Justification: causes non-serious data loss
First, create a round-robin database that will hold our test data. rrdtool create testdata.rrd --start 1224453000 --step 1800 \ DS:testdata:GAUGE:28000:0:U RRA:LAST:0.5:1:1800 Then, populate it with numbers: rrdtool update testdata.rrd 1224453300:1350535 rrdtool update testdata.rrd 1224467700:1350545 rrdtool update testdata.rrd 1224482100:1350554 rrdtool update testdata.rrd 1224496500:1350560 rrdtool update testdata.rrd 1224514800:1350562 rrdtool update testdata.rrd 1224539700:1350562 rrdtool update testdata.rrd 1224557700:1350562 rrdtool update testdata.rrd 1224576000:1350562 rrdtool update testdata.rrd 1224590100:1350562 rrdtool update testdata.rrd 1224604800:1350562 rrdtool update testdata.rrd 1224622500:1350562 rrdtool update testdata.rrd 1224636900:1350562 rrdtool update testdata.rrd 1224651300:1350562 rrdtool update testdata.rrd 1224669300:1350562 rrdtool update testdata.rrd 1224683700:1350562 rrdtool update testdata.rrd 1224698100:1350562 rrdtool update testdata.rrd 1224712500:1350562 rrdtool update testdata.rrd 1224730500:1350562 rrdtool update testdata.rrd 1224744900:1350562 Let's plot it: rrdtool graph testdata.png -t testdata --start 1224453000 --end 1224757634 \ DEF:testdata=testdata.rrd:testdata:LAST 'LINE2:testdata#ff0000' Result (correct): http://lh4.ggpht.com/patrakov/SQBmKaXKPtI/AAAAAAAAAOc/O8iAIBxWbw4/s800/testdata.png Indeed, there is not much change. But let's suppose that we are really interested in the small change that happened over the week. Let's use the alternative autoscaling option that, according to the manual page, is designed specifically for such cases: rrdtool graph testdata-bug.png -t testdata --start 1224453000 --end 1224757634 \ -A -Y DEF:testdata=testdata.rrd:testdata:LAST 'LINE2:testdata#ff0000' Result (wrong): http://lh4.ggpht.com/patrakov/SQBmKohptyI/AAAAAAAAAOk/29p6b-TuuJw/s800/testdata-bug.png The buggy image says that testdata is about 35000M, while it is actually at 1.35M. Misleading plot = data loss. -- System Information: Debian Release: lenny/sid APT prefers testing APT policy: (500, 'testing') Architecture: i386 (i686) Kernel: Linux 2.6.26-1-686 (SMP w/2 CPU cores) Locale: LANG=ru_RU.CP1251, LC_CTYPE=ru_RU.CP1251 (charmap=CP1251) Shell: /bin/sh linked to /bin/bash Versions of packages rrdtool depends on: ii libc6 2.7-14 GNU C Library: Shared libraries ii libfontconfig1 2.6.0-1 generic font configuration library ii libpixman-1-0 0.10.0-2 pixel-manipulation library for X a ii libpng12-0 1.2.27-2 PNG library - runtime ii librrd4 1.3.1-4 Time-series data storage and displ ii libx11-6 2:1.1.5-2 X11 client-side library ii libxcb-render-util0 0.2.1+git1-1 utility libraries for X C Binding ii libxcb-render0 1.1-1.1 X C Binding, render extension ii libxcb1 1.1-1.1 X C Binding ii libxrender1 1:0.9.4-2 X Rendering Extension client libra ii zlib1g 1:1.2.3.3.dfsg-12 compression library - runtime rrdtool recommends no packages. Versions of packages rrdtool suggests: pn librrds-perl <none> (no description available) -- no debconf information -- Alexander E. Patrakov -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
