IOwait high cause performance low on single node Last updated Save as PDF Share Share Tweet Share Views:90Visibility:PublicVotes:0Category:storagegrid-webscaleSpecialty:PerfLast Updated: Applies to StorageGRID webscale Issue IOwait high cause performance low. The CPU utilization is high because the iowait is high. SLSA(CPU Load Average) alert trigger in Historical Alarms.