LUN expansion caused high server load and database hang

Issue

• Hitachi Lun expansion resulted in high load on the server causing oracle database hang.

Jul 24 10:51:39 localhost kernel: sd 1:0:0:2: [sdbx] 629145600 512-byte logical blocks: (322 GB/300 GiB)
Jul 24 10:51:39 localhost kernel: sdbx: detected capacity change from 161061273600 to 322122547200
Jul 24 10:51:47 localhost kernel: sd 1:0:1:2: [sdcp] 629145600 512-byte logical blocks: (322 GB/300 GiB)
Jul 24 10:51:47 localhost kernel: sdcp: detected capacity change from 161061273600 to 322122547200
Jul 24 10:51:58 localhost kernel: sd 1:0:2:2: [sddh] 629145600 512-byte logical blocks: (322 GB/300 GiB)
Jul 24 10:51:58 localhost kernel: sddh: detected capacity change from 161061273600 to 322122547200
Jul 24 10:52:03 localhost kernel: sd 1:0:3:2: [sddz] 629145600 512-byte logical blocks: (322 GB/300 GiB)
Jul 24 10:52:03 localhost kernel: sddz: detected capacity change from 161061273600 to 322122547200
Jul 24 10:52:14 localhost kernel: sd 2:0:0:2: [sdd] 629145600 512-byte logical blocks: (322 GB/300 GiB)
Jul 24 10:52:14 localhost kernel: sdd: detected capacity change from 161061273600 to 322122547200
Jul 24 10:52:18 localhost kernel: sd 2:0:3:2: [sdv] 629145600 512-byte logical blocks: (322 GB/300 GiB)
Jul 24 10:52:18 localhost kernel: sdv: detected capacity change from 161061273600 to 322122547200
Jul 24 10:52:33 localhost kernel: sd 2:0:1:2: [sdbf] 629145600 512-byte logical blocks: (322 GB/300 GiB)
Jul 24 10:52:33 localhost kernel: sdbf: detected capacity change from 161061273600 to 322122547200
Jul 24 10:52:47 localhost rsyslogd-2177: imuxsock lost 16 messages from pid 3994 due to rate-limiting
Jul 24 10:52:47 localhost multipathd: 360060e8006d203000000d203000000ae: resize map (operator)