You need: https://github.com/HewlettPackard/POSH-HPOneView/wiki
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#
#Naam: Oneview Clear Alarms
#Version: 0.1
#Author: Ward Vissers
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# Adding PowerCLI core snapin, also check if powerCLI module is alsready added
if (!(get-module -name HPOneView.400 -erroraction silentlycontinue)) {
import-module HPOneView.400 | out-null
}
$oneviewserver = “oneview.wardvissers.nl”
Connect-HPOVMgmt -Hostname $oneviewserver
Get-HPOVAlert | Set-HPOVAlert -Cleared
Get-HPOVAlert -State Active | Set-HPOVAlert -Cleared