There are times you need to clear Exadata storage alerts. Its very important that you investigate and resolve the issue before clearing any storage alers. Additionally, you want to make a note of storage alert before you clear that alert. You can follow below steps to clear storage alert on one or all storage cells
Step 1 : Login to cellcli utility
[root@cell01 ~]# cellcli CellCLI: Release 220.127.116.11.0 - Production on Wed Jun 27 19:32:28 EDT 2018 Copyright (c) 2007, 2016, Oracle and/or its affiliates. All rights reserved.
Step 2 : Validate cell configuration
CellCLI> ALTER CELL VALIDATE CONFIGURATION ; Cell exceladm01 successfully altered
Step 3 : List Exadata Storage Alerts
CellCLI> list alerthistory 1 2018-06-13T11:09:48-04:00 critical "ORA-00700: soft internal error, arguments: [main_21], , [Not enough open file descriptors], , , , , , , , , " 2 2018-06-13T11:35:06-04:00 critical "RS-700 [No IP found in Exadata config file] [Check cellinit.ora]          " 3_1 2018-06-25T13:26:17-04:00 critical "Configuration check discovered the following problems: Verify network configuration: 3_2 2018-06-26T13:25:17-04:00 clear "The configuration check was successful."
Step 4 : Drop all Storage alerts
CellCLI> drop alerthistory all Alert 1 successfully dropped Alert 2 successfully dropped
Step 5 : List storage alerts to validate they are gone
CellCLI> list alerthistory CellCLI> exit quitting
Step 6 : Repeat above steps on all storage cells