VMFleet Workload Profiles¶

This guide covers the predefined workload profiles for VMFleet testing and how to execute them.

Built-in Profiles¶

Profile	Description
General	Balanced 70/30 read/write, 70% random, 8K blocks — general purpose validation
Peak IOPS	100% random 4K reads — maximum IOPS measurement
VDI	Mixed small block I/O simulating Virtual Desktop Infrastructure patterns
SQL OLTP	8K random read/write mix simulating SQL Server OLTP workloads
Sequential Throughput	100% sequential 512K writes for maximum MB/s measurement

Running Tests¶

Single Profile¶

.\src\solutions\vmfleet\scripts\Start-VMFleetTest.ps1 `
    -ProfilePath "config/profiles/vmfleet/general.yml" `
    -DurationSeconds 300

Profile Sweep¶

.\src\solutions\vmfleet\Invoke-VMFleetPipeline.ps1 `
    -ClusterConfigPath "config/clusters/my-cluster.yml" `
    -ProfilePaths @(
        "config/profiles/vmfleet/general.yml",
        "config/profiles/vmfleet/peak-iops.yml",
        "config/profiles/vmfleet/sql-oltp.yml",
        "config/profiles/vmfleet/vdi.yml",
        "config/profiles/vmfleet/sequential-throughput.yml"
    )

Profile Configuration¶

Profiles are defined in config/profiles/vmfleet/:

# config/profiles/vmfleet/general.yml
profile:
  name: "General"
  description: "Balanced read/write workload for general validation"
  parameters:
    block_size: "8k"
    write_ratio: 30
    random_ratio: 70
    outstanding_io: 8
    threads_per_vm: 2
    duration_seconds: 300
    warmup_seconds: 60

Profile Parameters¶

Parameter	Description	Example
`block_size`	I/O block size	`4k`, `8k`, `64k`
`write_ratio`	Percentage of I/O that is writes (0–100)	`30` for 70/30 read/write
`random_ratio`	Percentage of I/O that is random (0–100)	`70` for mostly random
`outstanding_io`	I/O queue depth per thread	`8`
`threads_per_vm`	DiskSpd threads per fleet VM	`2`
`duration_seconds`	Test duration (excluding warmup)	`300`
`warmup_seconds`	Warmup before measurement starts	`60`

DiskSpd Parameter Mapping¶

Profile key	DiskSpd switch	Meaning
`block_size`	`-b`	I/O block size
`write_ratio`	`-w`	Write ratio percentage
`random_ratio`	`-r`	Random I/O ratio percentage
`outstanding_io`	`-o`	Queue depth per thread
`threads_per_vm`	`-t`	Threads per VM
`duration_seconds`	`-d`	Measurement duration
`warmup_seconds`	`-W`	Warmup duration

Expected Thresholds¶

Profile	Primary metric focus	Typical pass criteria
General	Balanced IOPS + latency	Stable mixed IOPS and latency under target
Peak IOPS	Max read IOPS	Highest sustained random read IOPS
SQL OLTP	Read/write DB pattern	Low latency under mixed random load
VDI	Light mixed desktop load	Predictable latency across many VMs
Sequential Throughput	MB/s	Highest sustained throughput

Profile Selection Guide¶

Use peak-iops.yml for storage ceiling discovery.
Use sql-oltp.yml for database-aligned validation.
Use vdi.yml for desktop density readiness checks.
Use sequential-throughput.yml for bulk transfer throughput checks.
Use general.yml for a balanced baseline run.

Collecting Results¶

After tests complete, parse DiskSpd XML output and aggregate metrics:

.\src\solutions\vmfleet\scripts\Collect-VMFleetResults.ps1 `
    -ResultsPath "results/current-run/"

Next Steps¶

Monitoring — Metric collection during tests
Reporting — Generate reports from results