i am using Veeam one v9 and have 4x UCS B200 M4 Server with 2x 300 GB 10K 64MB Cache (Raid 1) for a Hyper-V Cluster.
I have also 6x UCS B200 M3 Server with 2x 300 GB 10k 32MB Cache (Raid 1) for a other Hyper-V Cluster.
But i get often this error on all UCS B200 M4 Server. Sometimes 16 Milliseconds sometimes 17 Milliseconds.
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Host disk write latency
"Disk/Host: Avg Disk sec/Write" (16.0 Milliseconds) is above a defined threshold (15.0 Milliseconds) for 'C:';
This host disk (logical disk) has exceeded the threshold for total write latency. This performance monitor counter measures the amount of time that write operations take to respond to the operating system
As a general rule of thumb, average response times greater than 15ms are considered sub-optimal. This is based on the typical seek time of a single 7200 RPM disk drive without cache. Physical disks installed on a non-virtualized environment offer better performance than disks accessed through a Hyper-V host operating system
View the host disk latency for historical information. If your workload is disk-intensive, consider using SCSI controllers for the VMs running on this host as they can reduce CPU overhead and enable a virtual SCSI bus to provide multiple transactions simultaneously. Be aware that not all guest OS supports that configuration. If that's not possible, add additional SCSI-connected VHDs (preferably ones that are stored on separate physical spindles or arrays on the host server). Also if you have any concurrently running resource intensive tasks (backup jobs, antivirus checks etc.), consider using different time schedule in order to offload you host disks
I update the LSI Raid controller Driver. I use the same OS 2012 R2 and Virusscanner on both Type of Server.
Someone have some idee to fix it?