FSLogix Deep Dive
Profiles, Cloud Cache & Versions 2026

Current FSLogix Versions — v3 Era (2025/2026)

Microsoft uses YY.MM naming. Download at aka.ms/fslogix-latest. No backports — always upgrade to latest for support eligibility.

Profile Container vs ODFC Container

The fundamental architecture decision: one big container or two smaller specialized ones.

FSLogix Profile Container Options

Key registry settings that determine container behavior. Set via GPO (HKLM\SOFTWARE\FSLogix\Profiles) or Intune configuration profile.

Cloud Cache Configuration & Best Practices

Cloud Cache provides native HA/DR: write-first to local cache, async replication to 1–4 remote providers (SMB/Azure). No DFS-R needed. Not the same as Azure StorSimple.

Cloud Cache Config Example (2 Providers)

# GPO/Intune Registry — HKLM\SOFTWARE\FSLogix\Profiles
CCDLocations (REG_MULTI_SZ):
  type=smb,name="EastUS-Primary",connectionString=\\storeast.file.core.windows.net\profiles
  type=smb,name="WestUS-DR",connectionString=\\storwest.file.core.windows.net\profiles-dr

CacheDirectory = D:\FSLogixCache           # Ephemeral SSD on Azure VM
ClearCacheOnLogoff = 1                      # Always for non-persistent
HealthyProvidersRequiredForRegister = 1     # Allow logon if 1 provider up
CcdUnregisterTimeout = 0                    # Don't time out at logoff

redirections.xml — What to Exclude

Critical for keeping containers lean. Excluded paths are redirected to local temp — not included in VHDX. Wrong exclusions = data loss. Too few = container bloat.

<?xml version="1.0" encoding="UTF-8"?>
<!--
  FSLogix Redirections.xml — Production 2026
  Place at: \\server\share\ProfileContainers\Redirections.xml
  Or: C:\Program Files\FSLogix\Apps\frxshell.exe redirections
-->
<FrxProfileFolderRedirection ExcludeCommonFolders="47">
  <Excludes>
    <!-- Browser caches (major bloat source) -->
    <Exclude Copy="0">AppData\Local\Google\Chrome\User Data\Default\Cache</Exclude>
    <Exclude Copy="0">AppData\Local\Microsoft\Edge\User Data\Default\Cache</Exclude>
    <Exclude Copy="0">AppData\Local\Mozilla\Firefox\Profiles</Exclude>
    <!-- Teams 2.x cache -->
    <Exclude Copy="0">AppData\Local\Packages\MSTeams_8wekyb3d8bbwe\LocalCache</Exclude>
    <Exclude Copy="0">AppData\Local\Temp</Exclude>
    <Exclude Copy="0">AppData\Local\Microsoft\Windows\INetCache</Exclude>
    <Exclude Copy="0">AppData\Local\Microsoft\Windows\WebCache</Exclude>
    <!-- Windows Update artifacts -->
    <Exclude Copy="0">AppData\Local\Microsoft\Windows\DeliveryOptimization</Exclude>
    <!-- OneDrive sync cache (handled by ODFC container) -->
    <Exclude Copy="0">AppData\Local\Microsoft\OneDrive\logs</Exclude>
    <Exclude Copy="0">AppData\Local\Microsoft\OneDrive\setup</Exclude>
  </Excludes>
</FrxProfileFolderRedirection>

Storage Sizing & Tier Selection

frx Command-Line Tool — Production Commands

# List all profile containers on share
frx list-profiles -filename \\server\share

# Show size breakdown of a specific container
frx list-profile-size -vol \\server\share\ -username jsmith

# Copy local profile into FSLogix container
frx copy-profile -filename "D:\profiles\jsmith.vhdx"
  -username jsmith -domain CORP

# Compact VHDX (reclaim free space)
frx compact-profile -filename "D:\profiles\jsmith.vhdx"

# Check container integrity
frx verify-container -filename "D:\profiles\jsmith.vhdx"

# Enable verbose logging (temp)
reg add HKLM\SOFTWARE\FSLogix\Logging /v LoggingEnabled /t REG_DWORD /d 1
reg add HKLM\SOFTWARE\FSLogix\Logging /v LogLevel /t REG_DWORD /d 4
# Logs land at: C:\ProgramData\FSLogix\Logs

# Event log path (most useful)
# Applications and Services Logs →
#   Microsoft → FSLogix → Apps → Operational
# Key Event IDs:
#   26 = Profile container mount FAILED
#   27 = Provider health change (Cloud Cache)
#   60 = Profile container mounted OK
#   61 = Profile container dismounted OK

# Flush and recreate stale container lock
frx delete-profile-lock -filename "D:\profiles\jsmith.vhdx"

Common FSLogix Issues & Fixes

FSLogix by Platform — Key Differences

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