08-08-2014
The new kind of BIOS is indeed a problem. You will need to do some wrangling to get any kind of installation media to boot at all.
I too have heard horror stories of laptops which simply will not boot anything but their hard drive, but I haven't actually found anything that bad yet. I've always been able to make them boot one way or another.
Ubuntu may be the easiest to start with. Their CD's may actually be recognized as 'valid' media even without having to drag "secure boot" away kicking and screaming, and its installer knows how to deal with modern machines.
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LEARN ABOUT CENTOS
systemd-readahead-done.timer
SYSTEMD-READAHEAD-REPLAY.SERVICE(8) systemd-readahead-replay.service SYSTEMD-READAHEAD-REPLAY.SERVICE(8)
NAME
systemd-readahead-replay.service, systemd-readahead-collect.service, systemd-readahead-done.service, systemd-readahead-done.timer, systemd-
readahead - Disk read ahead logic
SYNOPSIS
systemd-readahead-replay.service
systemd-readahead-collect.service
systemd-readahead-done.service
systemd-readahead-done.timer
/usr/lib/systemd/systemd-readahead/systemd-readahead [OPTIONS...] COMMAND [DIRECTORY | FILE]
DESCRIPTION
systemd-readahead-collect.service is a service that collects disk usage patterns at boot time. systemd-readahead-replay.service 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.
systemd-readahead-done.service is executed a short while after boot completed and signals systemd-readahead-collect.service to end data
collection. On this signal, this service will then sort the collected disk accesses and store information about them in /.readahead.
Normally, both systemd-readahead-collect.service and systemd-readahead-replay.service 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 systemd-readahead-collect.service.
On rotating media, when replaying disk accesses at early boot, systemd-readahead-replay.service 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,
systemd-readahead-collect.service will also defragment and rearrange files on disk to optimize subsequent boot times.
OPTIONS
systemd-readahead understands the following options:
-h, --help
Prints a short help text and exits.
--max-files=
Maximum number of files to read ahead. Only valid for thes collect command.
--file-size-max=
Maximum size of files in bytes to read ahead. Only valid for the collect and replay commands.
--timeout=
Maximum time in microseconds to spend collecting data. Only valid for the collect command.
COMMANDS
The following commands are understood by systemd-readahead:
collect [DIRECTORY]
Collect read-ahead data on early boot. When terminating, it will write out a pack file to the indicated directory containing the
read-ahead data.
replay [DIRECTORY]
Perform read-ahead on the specified directory tree.
analyze [FILE]
Dumps the content of the read-ahead pack file to the terminal. For each file, the output lists approximately how much will be read
ahead by the replay command.
SEE ALSO
systemd(1)
systemd 208 SYSTEMD-READAHEAD-REPLAY.SERVICE(8)