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Mac OS X Server 10.3: Tested and theoretical maximums (limits)

The table below lists the tested and theoretical maximums (limits) for services offered by Mac OS X Server 10.3 or later.

This article has been archived and is no longer updated by Apple.

Note: Tested maximums reflect the test configuration and do not represent a guarantee of performance. Your experience may vary depending on factors such as computer model, microprocessor speed, network conditions, hard disk space, disk fragmentation, installed memory (RAM), client load, total number of services running on the server, or other software used on the server. Information left blank in the table is not yet available.

Tested and Theoretical Maximums

Component Maximum Tested Theoretical
AFP Server Number of Connected Users 1000 N/A
AFP Server Shareable Volume Size 16 TB 16 TB
AFP Server Number of Files per Volume 250 million 2 147 483 646
AFP Server Number of Shared Items (Share Points) 255 255
BSD Kernel Number of Processes (Note 1) 2048  
BSD Kernel Number of Processes per UID (Note 2) 1000  
BSD kernel Size of Argument 256 KB 256 KB
Core OS Number of Open Files 1000 12288
Directory Services Number of Groups 10000  
Directory Services Number of Users 10000  
Directory Services Number of Users per Group 10000  
Directory Services Number of Groups per User 16 16
FTP Server Number of Connected Users   16384
FTP Server Number of Connections per User   16384
Macintosh Manager Client Number of Approved Desktop Printers Per Workgroup 5 10
Mail Server Number of Incoming SMTP Connections 256 2000
Mail Server Number of Outgoing SMTP Connections 256 2000
Mail Server Number of POP Connections 512 2000
Mail Server Number of IMAP Connections 512 2000
Mail Server Number of Messages in System (Note 3) 1.5 million File system maximum
Mail Server Number of Entries in SMTP Server Rejection List 128 N/A
Mail Server Number of Entries in Approved SMTP Hosts List 128 N/A
NetBoot Number of Clients Simultaneously Using NetBoot 50  
Print Server Number of Queues 60  
QTSS Number of Connected Users per Streamed File   12288
QTSS Number of Simultaneously Streamed Files   12288
QTSS Number of Connected Users   12288
SMB Server Number of Open Files 1000 12288
SMB Server Number of Connected Users 1000 1000
User Accounts User Comments Character Limit 54662 N/A
Web Server Number of Connected Users   2048
Web Server Number of Open Files   12288


Notes:

  1. For comparison, the maximum is 532 in the standard version of Mac OS X 10.3 Panther.
  2. Many applications run with their own UID. For comparison, the maximum is 100 in the standard version of Mac OS X 10.3 Panther.
  3. Mail is no longer stored in a database, but rather as a file per message.

 

Last Modified: Feb 20, 2012

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