[HPADM] strange system bottleneck during Oracle 7.3.4 startup on HPUX 10.20 K580

Ted.Fisher_at_dana.com
Date: 06/25/03

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    To: hpux-admin@dutchworks.nl
Date: Wed, 25 Jun 2003 16:32:51 -0400

    List,
            We have a K580 running HPUX 10.20 and two Oracle 7.3.4 SIDs. When
    the second SID is started it appears to hang the entire system. Until the
    second SID is up the first is completely frozen (user sessions), glance
    will not start or update if already running, etc. The load average climbs
    to over 12 while the DB is starting and drops once it's up. Top will run
    and shows the CPU very low which would indicate that the high load value
    is due to IO. Sar shows disk queues pretty low though (=< .50). I can
    log in a new session with no problem. The behavior of the system is
    similar to when a disk dies and IO's get hung causing any IO related
    process to hang. But, I can't find what kind of IO is hanging or why. We
    have other similar systems which don't appear to have this problem. Has
    anyone seen this kind of behavior before or have any suggestions as to how
    to identify the bottleneck?

    I will summarize.

    Thanks.

    Ted F. Fisher
    Dana Corporation
    Global Information Technology Group
    Technical Team
    Ted.Fisher@dana.com 

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