When planning an on-premises VDI deployment for about 200 office workers, which factor is typically the first sizing constraint that determines how many virtual desktops a single host or cluster can support?
Storage I/O performance (measured in available IOPS and latency) is usually the primary bottleneck in an on-premises VDI environment. During boot, logon, antivirus scans and other "I/O storms," hundreds of desktops can generate intense, bursty disk traffic. If the shared storage array cannot deliver enough IOPS with low latency, desktops will feel sluggish no matter how much CPU, RAM or network capacity is available. Adequate LAN bandwidth and strong security are important, but they rarely limit user experience in a local deployment before storage throughput does.
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