Increased iostat %util disk utilization on Standby DB after updating OL7.9 kernel from UEK4 to UEK6
After updating Oracle Linux 7.9 from kernel version 4.1.12-124.46.4.1.el7uek.x86_64 to kernel version 5.4.17-2136.304.4.1.el7uek.x86_64,
we observe a significant increase in % of disk utilization on the standby base.
The oracle 12c standby/primary database configuration has not changed.
The current version of the database is Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
iostat-x metrics before kernel update (primary db)
Linux 4.1.12-124.46.4.1.el7uek.x86_64 (twodb2) 21.02.2022 _x86_64 avg-cpu: %user %nice %system %iowait %steal %idle 16,71 0,03 6,08 0,50 0,00 76,68 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util sdd 1,53 2,07 239,68 246,24 21204,53 3360,93 101,11 0,10 0,21 0,30 0,12 0,17 8,46
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