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Full Discussion: NIM Questions
Operating Systems AIX NIM Questions Post 302277660 by shockneck on Saturday 17th of January 2009 09:29:04 AM
Old 01-17-2009
Quote:
Originally Posted by balaji_prk
I have been trying to increase the NIM usage in my AIX environment especially for patching,[...]
Maintaining several lpp_sources can be tedious. During a bos-inst operation NIM can handle one lpp_source only and therefore you need a second lpp_source mainly for updates. You have three choices:
1) Create a second lpp_source for updates only.
2) Get the latest AIX base install media and create a new lpp_source.
3) Migrate the update filesets into your existing lpp_source.
Depending on which method you choose you have the following advantages / disadvantages:
Choice No. 1: Easiest possibility but will fail if updates are needed during base installation.
Choice No. 2: Easy but need extra work (which you probably would like to avoid as otherwise you would not have asked your questions). Might even be impossible on certain (rare) occasions.
Choice No. 3: IMHO best solution - however: must be done manually as there is no NIM or other AIX tool available.

What I do: I create hardlinks from the new filesets into my existing (base installation) lpp_source and rebuild the .toc. At the moment the update filesets become superseeded themselves I can simply remove the hardlinks and create new ones from the then latest filesets. This way I can use one lpp_source for both base installation and updates.
 

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LEARN ABOUT CENTOS

systemd-readahead-collect.service

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)
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