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Archived - Mac OS X Server 10.2: Tested and Theoretical Maximums (Limits)

The table below lists the tested and theoretical maximums (limits) for services offered by Mac OS X Server 10.2 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This article has been archived and is no longer updated by Apple.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
Core OS Number of Open Files 1000 12288
AFP Server Number of Connected Users 1000 N/A
User Accounts User Comments Character Limit 54662 N/A
Directory Services Number of Groups per User 16 16
Directory Services Number of Groups 10000  
Directory Services Number of Users 10000  
AFP Server Shareable Volume Size 8 TB 8 TB
AFP Server Number of Files per Volume 250 million 2 147 483 646
AFP Server Number of Shared Items 255 255
Web Server Number of Connected Users   2048
SMB Server Number of Open Files 1000 12288
SMB Server Number of Connected Users 1000 1000
Mail Server Number of Incoming SMTP Connections   512
Mail Server Number of Outgoing SMTP Connections   256
Mail Server Number of POP Connections   1024
Mail Server Number of IMAP Connections   1024
Mail Server Maximum Size of Mail Database 128 GB  
Mail Server Number of Messages in Mail Database 4 billion  
FTP Server Number of Connected Users   16384
FTP Server Maximun no. of Connections per User   16384
Web Server Number of Open Files   12288
QTSS Number of Connected Users per Streamed File   12288
QTSS Number of Simultaneously Streamed Files   12288
QTSS Number of Connected Users   12288
Print Server Number of Queues 60  
Macintosh Manager Client Number of Approved Desktop Printers Per Workgroup 5 10
NetBoot Number of Clients Simultaneously Using NetBoot 50  
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

Last Modified: Feb 17, 2012
  • Last Modified: Feb 17, 2012
  • Article: TA21110
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