From: Brian Warner Date: Fri, 19 Sep 2008 19:30:53 +0000 (-0700) Subject: NEWS: finish editing for the upcoming 1.3.0 release X-Git-Url: https://git.rkrishnan.org/simplejson/components/com_hotproperty/COPYING.TGPPL.html?a=commitdiff_plain;h=1c8920888438dbf80405872dafbc4bf9a18b01c9;p=tahoe-lafs%2Ftahoe-lafs.git NEWS: finish editing for the upcoming 1.3.0 release --- diff --git a/NEWS b/NEWS index 4150a2f1..00225a5f 100644 --- a/NEWS +++ b/NEWS @@ -160,19 +160,54 @@ support/bin because Twisted is a dependency of Tahoe). ** Grid Management Tools -stats - include disk-free information +Several tools have been added or updated in the misc/ directory, mostly munin +plugins that can be used to monitor a storage grid. + +The misc/spacetime/ directory contains a "disk watcher" daemon (startable +with 'tahoe start'), which can be configured with a set of HTTP URLs +(pointing at the webapi '/statistics' page of a bunch of storage servers), +and will periodically fetch disk-used/disk-available information from all the +servers. It keeps this information in an Axiom database (a sqlite-based +library available from divmod.org). The daemon computes time-averaged rates +of disk usage, as well as a prediction of how much time is left before the +grid is completely full. + +The misc/munin/ directory contains a new set of munin plugins +(tahoe_diskleft, tahoe_diskusage, tahoe_doomsday) which talk to the +disk-watcher and provide graphs of its calculations. + +To support the disk-watcher, the Tahoe statistics component (visible through +the webapi at the /statistics/ URL) now includes disk-used and disk-available +information. Both are derived through an equivalent of the unix 'df' command +(i.e. they ask the kernel for the number of free blocks on the partition that +encloses the BASEDIR/storage directory). In the future, the disk-available +number will be further influenced by the local storage policy: if that policy +says that the server should refuse new shares when less than 5GB is left on +the partition, then "disk-available" will report zero even though the kernel +sees 5GB remaining. + +The 'tahoe_overhead' munin plugin interacts with an allmydata.com-specific +server which reports the total of the 'deep-size' reports for all active user +accounts, compares this with the disk-watcher data, to report on overhead +percentages. This provides information on how much space could be recovered +once Tahoe implements some form of garbage collection. + +** Other Changes + +Clients now declare their "oldest-supported version" to be 1.0.0 . This is +part of a backwards-compatibility system that has not yet been fully +specified. Previous releases declared their oldest-supported-version to be +the same as their current version number. + +Several bugs have been fixed, including one that would cause an exception (in +the logs) if a webapi download operation was cancelled (by closing the TCP +connection, or pushing the "stop" button in a web browser). + +Tahoe now uses Foolscap "Incidents", writing an "incident report" file to +logs/incidents/ each time something weird occurs. These reports are available +to an "incident gatherer" through the flogtool command. For more details, +please see the Foolscap logging documentation. -disk-watcher daemon, uses axiom -spacetime munin plugins: space-used, space-left, time-left/doomsday -tahoe_overhead plugin - -** other - -storage declares oldest-supported-version = 1.0 - -bugs fixed - download self._paused * Release 1.2.0 (2008-07-21)