Re: IO Freeze ON RHEL 6.6 and hence high log file sync
From: Hans Forbrich <fuzzy.graybeard_at_gmail.com>
Date: Wed, 18 Apr 2018 13:27:04 -0600
Message-ID: <c72617f6-4300-80bd-e39e-fe3f7247cf30_at_gmail.com>
Date: Wed, 18 Apr 2018 13:27:04 -0600
Message-ID: <c72617f6-4300-80bd-e39e-fe3f7247cf30_at_gmail.com>
Have you eliminated possible issues with the physical and logical connectivity between the host and the storage service?
/Hans
On 2018-04-18 11:25 AM, Purav Chovatia 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?
>
-- http://www.freelists.org/webpage/oracle-lReceived on Wed Apr 18 2018 - 21:27:04 CEST