Re: IO Freeze ON RHEL 6.6 and hence high log file sync
Date: Thu, 19 Apr 2018 01:43:06 +0700
Message-ID: <CAP50yQ8a+GwttBLRrFf5iUsN3rrz6Sm=SCzOuGFQvD4v-yD4Rw_at_mail.gmail.com>
Do you see any messages in either:
during that time?
On Thu, Apr 19, 2018 at 12:25 AM, Purav Chovatia <puravc_at_gmail.com> wrote:
> 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
>
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Received on Wed Apr 18 2018 - 20:43:06 CEST