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
+ 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
+ to end data collection. On this signal, this service
will then sort the collected disk accesses and store
- information about them disk in
+ information about them in
<filename>/.readahead</filename>.</para>
<para>Normally, both
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
+ 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
+ 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
+ it,
<filename>systemd-readahead-collect.service</filename>
will also defragment and rearrange files on disk to
optimize subsequent boot times.</para>
<term><option>--file-size-max=</option></term>
<listitem><para>Maximum size of files
- (in bytes) to read ahead. Only valid
+ in bytes to read ahead. Only valid
for the <command>collect</command>
and <command>replay</command>
commands.</para></listitem>
<varlistentry>
<term><option>--timeout=</option></term>
- <listitem><para>Maximum time (in usec)
- to to spend collecting data. Only valid
+ <listitem><para>Maximum time in microseconds
+ to spend collecting data. Only valid
for the <command>collect</command>
command.</para></listitem>
</varlistentry>
[<replaceable>DIRECTORY</replaceable>]</command></term>
<listitem>
<para>Collect read-ahead data on
- early boot. When terminating it will
+ early boot. When terminating, it will
write out a pack file to the indicated
directory containing the read-ahead
data. </para>
<listitem>
<para>Dumps the content of the
read-ahead pack file to the
- terminal. The output lists
- approximately for each file
- how much will be read-ahead by
+ terminal. For each file, the
+ output lists approximately how
+ much will be read ahead by
the <command>replay</command>
command.</para>
</listitem>