High I/O Latency reported by OEM during 220.127.116.11 RAC dNFS Database Imports
Last updated on FEBRUARY 22, 2016
Applies to:Oracle Database - Enterprise Edition - Version 18.104.22.168 and later
Information in this document applies to any platform.
OEM reports (under I/O tab) several I/O peaks and latencies (<=1600 ms) during RAC dNFS database Imports, for some sustain time (5~10 minutes). See screen shot attached.
If dNFS is disabled, OEM reports latencies under 1ms for the same database Import.
The same high I/O latencies, are not present in AWR reports, or monitoring reports done at the storage level.
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