Parallels RAS 19 Administrator's Guide - Drive redirection cache

Introduction
- Parallels RAS 19 release history
- About Parallels RAS
- About this guide
- What's new
- Terms and abbreviations used in this guide
Installing Parallels RAS
- System requirements
- Install Parallels RAS
- Log in and activate Parallels RAS
Getting Started with Parallels RAS
- The Parallels RAS Console
- Set up a basic Parallels RAS Farm
Farm and Sites
- Connecting to a Parallels RAS Farm
- About Sites
- Sites in the RAS Console
- Adding a Site to the Farm
- Replicating Site settings
- Managing Licensing Site
- Managing administrator accounts
RAS Connection Broker
- Configuring RAS Connection Brokers
- Secondary Connection Brokers
- Managing Secondary Connection Brokers
- Using computer management tools
RAS Secure Gateway
- Overview
- Adding a RAS Secure Gateway
- Manually adding a RAS Secure Gateway
- Checking the RAS Secure Gateway status
- Configuring a RAS Secure Gateway
- Secure Gateway tunneling policies
- Configure logging
- Viewing Secure Gateway summary and metrics
- Using computer management tools
RD Session Hosts
- RD Session Host types
- Add an RD Session Host
  - Installing the agent manually
- Add a template-based RD Session Host
- Manage RD Session Hosts
- Planning for high availability
- Managing logons
- Using computer management tools
- Publishing from an RD Session Host
- Viewing published resources
Virtual Desktop Infrastructure (VDI)
- Supported providers
- Add a provider
- Manage VDI
- Configure logging
- Enabling high availability for VDI
- Site defaults (VDI)
- Using computer management tools
- Viewing Provider summary
- Remote PC pools
Azure Virtual Desktop
- Introduction
- Prerequisites
- Deploy Azure Virtual Desktop
- Manage Azure Virtual Desktop
- Site defaults (Azure Virtual Desktop)
  - Site defaults for single-session hosts
  - Site defaults for multi-session hosts
- Using Parallels Client with Azure Virtual Desktop
- Verify the deployment
Remote PCs
- Overview
- Adding a Remote PC to a Farm
  - Admin-initiated Remote PC enrollment
  - Self-service Remote PC enrollment
- Configuring a Remote PC
- Viewing Remote PC summary
- Using computer management tools
Publishing
- Overview
- Publishing a desktop
- Publishing an application
- Publishing an application with MSIX app attach
- Publishing a web application
- Publishing a network folder
- Publishing a document
- General management tasks
- Manage published applications
- Manage published desktops
- Manage published documents
- Manage folders
- Site defaults (Publishing)
- Using filtering rules
- Configuring preferred routing
- Understanding session prelaunch
- Checking effective access
- Specifying client settings
- Quick keypad
Session Management
- Overview
- Session information
- Monitoring settings
- Managing sessions
- The Resources tab
SSL Certificate Management
- Generating a self-signed certificate
- Generating a certificate signing request (CSR)
- Let's Encrypt certificates
  - Requesting a Let's Encrypt Certificate
  - How Parallels RAS requests certificates from Let's Encrypt
- Importing a certificate
- Exporting a certificate
- Assigning a certificate to Secure Gateways and HALBs
- Auditing certificates
- Permissions to manage certificates
- Upgrading from an older RAS version
Connection and Authentication Settings
- RAS Connection Broker connection settings
- Remote session settings
- Logon hours settings
- Restricting access by Parallels Client type and build number
- Multi-factor authentication
- Allowing users to change domain password
- Allowing users to discover RAS connections via email address
Load Balancing and HALB
- Resource based & round robin load balancing
  - Configure CPU optimization
- High availability load balancing (HALB)
RAS Multi-Tenant Architecture
- Overview
- Architecture description
  - Implementation overview
  - User connection flow
- Deploying Tenant Broker and Tenants
- Managing Tenants
- Shared Gateways
- Third-party network load balancers
- Web Client and Themes
- Monitoring Tenants
- Tenant Broker compatibility and updates
- Upgrading from an older RAS version
- Configuring notifications
- Communication ports
SAML SSO Authentication
- Introduction
- System requirements
- SAML basics
- SAML configuration
- Parallels Client configuration
- Parallels client policy configuration
- Test the SAML SSO deployment
- Error messages
Parallels Web Client and User Portal
- Configure Web Client
- Configure Themes
- Open Parallels Web Client
- Main menu options
- Running remote applications and desktops
- Auto login
- Direct App access
- Using the toolbar
Universal Printing
- Managing Universal Printing settings
- Universal Printing drivers
- Font management
Universal Scanning
- Managing Universal Scanning
- Adding scanning applications
User Device Management and Client Policies
- Inviting users to connect to Parallels RAS
- Mass configuring user devices
- Enabling Help Desk support
- Monitoring devices
  - Getting additional device information
- Windows device groups
- Managing Windows devices
  - Windows desktop replacement
- Scheduling Windows devices & groups power cycles
- Client Policies
- Configuring remote file transfer
Reporting
- System requirements
- Install Microsoft SQL Server
  - Install Microsoft SQL Server 2016 or earlier
  - Install Microsoft SQL Server 2017 or 2019
- Install Parallels RAS Reporting
- Running Parallels RAS reports
- GDPR compliance
Performance Monitor
- Overview
- Install RAS Performance Monitor
- Using Parallels RAS Performance Monitor
- Configure RAS Performance Monitor Security
- Updating RAS Performance Monitor
Common Management Tasks
- Recovery - add a root administrator
- Host name resolution
- Computer management tools
- Site information
- Site settings
- Using MSIX application packages
- Using template versions
- Settings audit
- Upgrading RAS agents
- Licensing
- Configure HTTP proxy settings
- System event notifications
- RAS session variables
- Maintenance and backup
  - Exporting and importing Farm settings from the command line
- Problem reporting and troubleshooting
- Logging
- Suggest a feature
Parallels RAS Management Portal
- Overview
- Prerequisites
- Installation
- Log in to RAS Management Portal
- Configure RAS Web Administration Service
- RAS Management Portal user interface
Parallels RAS APIs
- RAS PowerShell API
- RAS REST API
- RAS Web Client API and Parallels Client URL scheme
Appendix
- Microsoft license requirements in Parallels RAS
- Port reference
- RAS performance counters

Drive redirection cache

This topic explains the Enable drive redirection cache option, which is available in a dialog where you configure RAS RD Session Host, VDI, Azure Virtual Desktop, or Remote PC agents. When the option is enabled, browsing folders on redirected drives becomes much faster thanks to the caching mechanism explained below.

Native RDP is not efficient for file and folder enumeration when using drive redirection, which results in slow and sluggish user experience. The Enable drive redirection cache option forces the session host to run the kernel-based driver (RasRdpFs). This optimizes how the communication is carried out compared to standard RDP and also adds caching of the folder structure on the session host (RDSH, VDI, or Azure Virtual Desktop). The driver starts as soon as the setting is pushed to the session host via Apply in the RAS Console. When this happens, all new sessions will have this functionality enabled. The existing sessions need to be reconnected to use this optimization.

Notes

A session host must run a 64-bit operating system.
The cache is per session and is paged into the driver memory.
On log off or disconnect, the cache is purged.
If the number of cached folders in the session exceeds the threshold, and the user accesses a new non-cached folder, then the oldest accessed folder is replaced in the cache.
When the option is switched off, all currently active user sessions will lose the cache (the driver is stopped and the cache is purged). This happens transparently to the user, but file and folder enumeration become slow.
When the option is switched on, all currently active user sessions will not automatically have the cache enabled. To use this functionality, the existing sessions will need to be reconnected.

Limitations

The option is applicable only to sessions initiated by the following versions of Parallels Client:
- Parallels Client for Windows versions 18 and later
- Parallels Client for macOS versions 19 and later
Similar to native RDP changes made on the client side (in a remote session), requires manual refresh (F5) in a redirected folder on the server side.

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