Scanning network shares iteratively checks whether the files or directories are modified based on the value of their timestamps. Files and directories qualify for backups if their timestamps have changed since the last job ran.
Multi-thread recursive scan uses multiple threads to scan the subclient content.
Performance Metrics
The following table compares performance metrics of multi-thread and single-thread scan operations on Windows and Linux computers.
Data set
Folder count: 15,000,000 (15 million)
File count: 38,000,000 (38 million)
Note: The data is exported from a filer using CIFS to Windows and using NFS to UNIX.
Windows
|
Number of Threads |
Full Backup |
Incremental backup |
|---|---|---|
|
Multi-threaded scan (Maximum of 100 threads) |
11:16:36 |
12:01:19 |
|
Single-threaded scan |
41:08:17 |
34:11:42 |
UNIX
|
Number of Threads |
Full Backup |
Incremental backup |
|---|---|---|
|
Multi-threaded scan (by default, 15 threads) |
05:29:54 |
02:51:18 |
|
Single-threaded scan |
56:48:28 |
19:31:34 |
Support
The following agents support Recursive Scan:
-
Microsoft Windows File System
For more information, see Selecting the Recursive Scan Method for the Windows File System Agent.
-
UNIX/Linux File Systems
For more information, see Selecting the Recursive Scan Method for the UNIX File System Agent.