IO Freeze ON RHEL 6.6 and hence high log file sync
From: Purav Chovatia <puravc_at_gmail.com>
Date: Wed, 18 Apr 2018 17:25:59 +0000
Message-ID: <CADrzpjE0C-uBOOScNy_bLN6rXNpySCTroSbxy8gnRJ-sJO=ijA_at_mail.gmail.com>
We are on RHEL 6.6 running a 2-node Oracle 12c RAC.
Date: Wed, 18 Apr 2018 17:25:59 +0000
Message-ID: <CADrzpjE0C-uBOOScNy_bLN6rXNpySCTroSbxy8gnRJ-sJO=ijA_at_mail.gmail.com>
We are on RHEL 6.6 running a 2-node Oracle 12c RAC.
All of a sudden, for 2-3 minutes, DATADG (asm diskgroup containing all data files) freezes for 2-3minutes with iostat showing 100% utilisation, very high svctm and very high write_await. But the r/s, w/s rsec/s and wsec/s is 0. Meaning no IO but still disk fully busy. So it’s like a freeze.
Has anybody experienced this and can somebody help as to what could be the reason?
Transparent huge pages were not disabled and general huge pages were not
configured. Now both done.Many thanks
-- http://www.freelists.org/webpage/oracle-lReceived on Wed Apr 18 2018 - 19:25:59 CEST