Hey Purav,
what does the DM-multipather say? Do you have failing paths? Otherwise you can
use blktrace to drill-down.
Best Regards
Stefan Koehler
Independent Oracle performance consultant and researcher
Website: http://www.soocs.de
Twitter: @OracleSK
Purav Chovatia <puravc@xxxxxxxxx> hat am 18. April 2018 um 19:25 geschrieben:--
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
