AIX

AIX

Connect with fellow AIX users and experts to gain knowledge, share insights, and solve problems.

 View Only
Back to discussions
Expand all | Collapse all

AIX 6100-04-01-0944 - sar: time change not positive after reboot

  • 1.  AIX 6100-04-01-0944 - sar: time change not positive after reboot

    Posted Tue December 08, 2009 03:13 AM

    Originally posted by: BOZY


    I searched through the forum and did not find any discussions, although sadc/sar issues date back to first release of AIX 5.3. Possibly, I am the only one left in the world who relies on 'sar' for daily average system load monitoring?

    After reboot, sar shows famous 'time change not positive' message and produces incorrect average, which makes all further statistics pointless:
    root@dbsrv1:/ # sar

    AIX dbsrv1 1 6 00C944E24C00 12/08/09

    System configuration: lcpu=6 ent=3.00 mode=Uncapped

    00:00:00 %usr %sys %wio %idle physc %entc
    01:00:00 0 0 0 100 0.01 0.3
    02:00:00 0 0 0 100 0.01 0.3
    03:00:00 0 0 0 100 0.01 0.3
    .....
    08:40:00 0 0 0 100 0.01 0.3
    09:00:00 0 0 0 100 0.01 0.3
    09:20:00 0 0 0 100 0.01 0.3
    09:31:40 aix restarts
    sar: time change not positive

    Average 3 0 97 0 272.76 9092.1
    10:00:00 0 0 0 100 0.01 0.4

    Average 0 0 0 100 0.01 0.4

    Latest Service Pack, which brings the system to the level 0944, mentions fixes to this behavior (IZ38140,IZ54807), but the problem seems to be here. I am using xntpd to synchronise time, but I doubt NTP breaks things, since sadc got a long track record of displaying incorrect results. To my understanding, this is a matter of only 1 wrong record in /var/adm/sa/sarDD file. Anyone encountered same issues and got any hints?

    Alex