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Diffstat (limited to 'man/systemd-readahead-replay.service.xml')
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diff --git a/man/systemd-readahead-replay.service.xml b/man/systemd-readahead-replay.service.xml deleted file mode 100644 index 66d253454b..0000000000 --- a/man/systemd-readahead-replay.service.xml +++ /dev/null @@ -1,113 +0,0 @@ -<?xml version='1.0'?> <!--*-nxml-*--> -<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" - "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> - -<!-- - This file is part of systemd. - - Copyright 2010 Lennart Poettering - - systemd is free software; you can redistribute it and/or modify it - under the terms of the GNU Lesser General Public License as published by - the Free Software Foundation; either version 2.1 of the License, or - (at your option) any later version. - - systemd is distributed in the hope that it will be useful, but - WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public License - along with systemd; If not, see <http://www.gnu.org/licenses/>. ---> - -<refentry id="systemd-readahead-replay.service"> - - <refentryinfo> - <title>systemd-readahead-replay.service</title> - <productname>systemd</productname> - - <authorgroup> - <author> - <contrib>Developer</contrib> - <firstname>Lennart</firstname> - <surname>Poettering</surname> - <email>lennart@poettering.net</email> - </author> - </authorgroup> - </refentryinfo> - - <refmeta> - <refentrytitle>systemd-readahead-replay.service</refentrytitle> - <manvolnum>8</manvolnum> - </refmeta> - - <refnamediv> - <refname>systemd-readahead-replay.service</refname> - <refname>systemd-readahead-collect.service</refname> - <refname>systemd-readahead-done.service</refname> - <refname>systemd-readahead-done.timer</refname> - <refname>systemd-readahead</refname> - <refpurpose>Disk read ahead logic</refpurpose> - </refnamediv> - - <refsynopsisdiv> - <para><filename>systemd-readahead-replay.service</filename></para> - <para><filename>systemd-readahead-collect.service</filename></para> - <para><filename>systemd-readahead-done.service</filename></para> - <para><filename>systemd-readahead-done.timer</filename></para> - <para><filename>/usr/lib/systemd/systemd-readahead</filename></para> - </refsynopsisdiv> - - <refsect1> - <title>Description</title> - - <para><filename>systemd-readahead-collect.service</filename> - is a service that collects disk usage patterns at boot - time. <filename>systemd-readahead-replay.service</filename> - is a service that replays this access data collected - at the subsequent boot. Since disks tend to be - magnitudes slower than RAM this is intended to improve - boot speeds by pre-loading early at boot all data on - disk that is known to be read for the complete boot - process.</para> - - <para><filename>systemd-readahead-done.service</filename> - is executed a short while after boot completed and signals - <filename>systemd-readahead-collect.service</filename> - to end data collection. On this signal this service - will then sort the collected disk accesses and store - information about them disk in - <filename>/.readahead</filename>.</para> - - <para>Normally, both - <filename>systemd-readahead-collect.service</filename> - and - <filename>systemd-readahead-replay.service</filename> - are activated at boot so that access patterns from the - preceding boot are replayed and new data collected - for the subsequent boot. However, on read-only media - where the collected data cannot be stored it might - be a good idea to disable - <filename>systemd-readahead-collect.service</filename>.</para> - - <para>On rotating media, when replaying disk accesses - at early boot - <filename>systemd-readahead-replay.service</filename> - will order read requests by their location on disk. On - non-rotating media, they will be ordered by their - original access timestamp. If the file system supports - it - <filename>systemd-readahead-collect.service</filename> - will also defragment and rearrange files on disk to - optimize subsequent boot times.</para> - </refsect1> - - <refsect1> - <title>See Also</title> - <para> - <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> - </para> - </refsect1> - -</refentry> |