Skip to main content
Sign Out

Welcome to Dell

My Account
  • Place orders quickly and easily
  • View orders and track your shipping status
  • Enjoy members-only rewards and discounts
  • Create and access a list of your products
  • Manage your Dell EMC sites, products, and product-level contacts using Company Administration.
Sign In Create an Account Dell Financial Services Premier Sign In Partner Program Sign In
Contact Us

Your Dell.com Carts

PowerProtect Data Manager 19.11 Virtual Machine User Guide

PDF

VM Direct Engine performance and scalability

The VM Direct Engine performance and scalability of depends on several factors, including the number of vCenter servers and proxies and the number of concurrent virtual machine backups. The following table provides information on these scalability factors and maximum recommendations, in addition to concurrence recommendations for sessions created from backups using the VM Direct Engine.

The count of sessions is driven by the number of proxies and backups running through this server.

Table 1. Performance and scalability factors
Component Maximum limit Recommended count Notes
Number of concurrent NBD and Preferred Hot Add backups per ESXi host 48   Ensure that your network has a bandwidth of 10 Gbps or higher. VMware uses Network File Copy (NFC) protocol to read VMDK using NBD transport mode. You need one VMware NFC connection for each VMDK file being backed up. The VMware Documentation provides more information on vCenter NFC session connection limits.
Concurrent VMDK backups per vCenter server 180 Can be achieved with a combination of the number of proxies multiplied by the number of configured Hot Add sessions per VM Direct Engine.
Number of proxies per vCenter server 25 7 A limit of 25 concurrent backup and recovery sessions.
Number of files and directories per file-level restore 200,000   File-level restores are recommended for quickly restoring a small set of files. Image-level or VMDK-level restores are optimized and recommended for restoring a large set of files and folders.

When you reach the limit for concurrent backup sessions, a warning message displays. The remaining sessions will be queued. You can adjust the session limits by modifying the MAX_VC_BACKUP_SESSIONS and MAX_NBD_BACKUP_SESSIONS variables in the environment file, according to the recommendations. The Knowledge Base article 543253 at https://support.emc.com/kb/543253 provides more information.

Table 2. Proxy session limits by proxy type
Component Total number of sessions (backup and recovery) maximum Notes
Added (External) VM Direct Engine 25  
Embedded VM Direct engine
NOTE The embedded VM Direct engine is pre-bundled with the PowerProtect Data Manager software.
4 The embedded VM Direct engine is only used as a fallback when all other proxies are disabled or in Failed state.

Rate this content

Accurate
Useful
Easy to understand
Was this article helpful?
0/3000 characters
  Please provide ratings (1-5 stars).
  Please provide ratings (1-5 stars).
  Please provide ratings (1-5 stars).
  Please select whether the article was helpful or not.
  Comments cannot contain these special characters: <>()\