Time travel Post: 302713153

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The Lounge War Stories Time travel Post 302713153 by bakunin on Wednesday 10th of October 2012 10:28:05 AM

10-10-2012

Registered User

Only now i got it: "IOS", not "I OS". Actually this is not a mainframe but a midrange system, just like the p-series - in fact it is the same hardware.

This system was formerly called "AS/400" and the OS "OS/400" and you will find probably a lot more under these terms than under "IOS". Most of it, even the most outdated information, will probably still apply because the system hasn't changed that much for the last 20 years.

The AS/400 is quite radically different from anyother machine (for instance it has a linear address space which spans memory AND disk space - you move a file and it is dumped from memory to disk) and getting around the concepts is probably quite hard first.

On the other hand the AS/400 is famous for needing next to no administration at all. There are many companies owning a AS/400 and having had no Sysadmin for the last 15 years. Try that with a Unix system, it would be long broken.

The network is an alien thing too: it is called 5250 and works similar to (but is still different from) the SNA system and the 3270 data stream the IBM mainframes use.

Now for the good news: because IOS systems work in p-Series hardware there are still VIOS and HMC and they work absolutely the same way as you are accustomed to. Just the LPARs running IOS are different (inside - they are still the same LPARs from outside, say, from the viewpoint of the VIOS or the HMC).

I hope this helps.

bakunin

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chrony

CHRONY(1)							   User's Manual							 CHRONY(1)

NAME

       chrony - programs for keeping computer clocks accurate

SYNOPSIS

       chronyc [OPTIONS]

       chronyd [OPTIONS]

DESCRIPTION

       chrony  is a pair of programs for keeping computer clocks accurate.  chronyd is a background (daemon) program and chronyc is a command-line
       interface to it. Time reference sources for chronyd can be RFC1305 NTP servers, human (via keyboard and chronyc), or the  computer's  real-
       time  clock at boot time (Linux only). chronyd can determine the rate at which the computer gains or loses time and compensate for it while
       no external reference is present. Its use of NTP servers can be switched on and off (through  chronyc)  to  support  computers  with  dial-
       up/intermittent access to the Internet, and it can also act as an RFC1305-compatible NTP server.

USAGE

       chronyc	is  a command-line interface program which can be used to monitor chronyd's performance and to change various operating parameters
       whilst it is running.

       chronyd's main function is to obtain measurements of the true (UTC) time from one of several sources, and correct the system clock  accord-
       ingly.  It also works out the rate at which the system clock gains or loses time and uses this information to keep it accurate between mea-
       surements from the reference.

       The reference time can be derived from either Network Time Protocol  (NTP)  servers,  reference	clocks,  or  wristwatch-and-keyboard  (via
       chronyc).  The main source of information about the Network Time Protocol is http://www.eecis.udel.edu/~ntp.

       It is designed so that it can work on computers which only have intermittent access to reference sources, for example computers which use a
       dial-up account to access the Internet.	Of course, it will work on computers with permanent connections too.

       In addition, for Linux 2.0.x (for x >= 32) or 2.2 onwards, chronyd can monitor the system's real time clock performance, so the system  can
       maintain accurate time even across reboots.

       Typical accuracies available between 2 machines are

       On  an ethernet LAN : 100-200 microseconds, often much better On a V32bis dial-up modem connection : 10's of milliseconds (from one session
       to the next)

       With a good reference clock the accuracy can reach one microsecond.

       chronyd can also operate as an RFC1305-compatible NTP server and peer.

SEE ALSO

       chronyc(1), chrony(1)

       http://chrony.tuxfamily.org/

AUTHOR

       Richard Curnow <rc@rc0.org.uk>

       This man-page was  written  by  Jan  Schaumann  <jschauma@netmeister.org>  as  part  of	"The  Missing  Man  Pages  Project".   Please  see
       http://www.netmeister.org/misc/m2p2/index.html for details.

       The complete chrony documentation is supplied in texinfo format.

chrony								 December 04, 2009							 CHRONY(1)