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Technical Information

System Requirements

Minimum Linux server system requirements for installation
  • Local Installation: 512 MiB RAM, 512 MiB Swap recommended
  • 2 GiB available disk space (more recommended, 8.5 GiB for all patterns)
  • 16 GiB for snapshot/rollback of the OS
Recommendations for specific uses
  • 512 MiB to 4 GiB RAM, at least 256 MiB per CPU
  • 4 GiB hard-disk space, 16 GiB for snapshot/rollback of the OS
  • Network interface (Ethernet, wireless or modem)
  • For Xen virtual host server–at least 512 MiB RAM for each virtual host server
  • For KVM virtual host server—KVM's limits are equal to those of SUSE Linux Enterprise Server
  • For Xen or KVM virtual machines—at least an additional 256 MiB RAM for each virtual machine
  • For print servers—a relatively faster processor or additional processors to improve server-based printing
  • For web servers—additional RAM to improve caching, and additional processors to improve web application performance
  • For database servers—additional RAM to improve caching, and multiple disks for parallel I/O
  • For file servers—additional memory and disks, or a Redundant Array of Inexpensive Disks (RAID) system to improve I/O throughput

SUSE Linux Enterprise 12 Kernel (4.4) Limits

SUSE Linux Enterprise 12 SP2
(Linux 4.4)
AMD64/Intel 64
IBM z Systems
CPU Bits 64 64 64 64
Max. Number of Logical CPUs 8192 256 2048 128
Max. RAM (Theoretical / Certified) 1 PiB/64 TiB 10 TiB/256 GiB 1 PiB/64 TiB 256 TiB/n.a.
Max. User space / Kernel Space 128 TiB/128 TiB N/A 2 TiB/2 EiB 256 TiB/128 TiB
Max. Swap Space up to 29 x 64 GiB (x86-64) or 30 x 64 GiB (other architectures)
Max. Number of Processes 1048576
Max. Number of Threads per Process Maximum limit depends on memory and other parameters (Tested with more than 120,000)
Max. Size per Block Device Up to 8 EiB on all 64-bit architectures

File System Support and Sizes

SUSE Linux Enterprise was the first enterprise Linux distribution to support journaling file systems and logical volume managers back in 2000. Later we introduced xfs to Linux, which today is seen as the primary workhorse for large-scale file systems, systems with heavy load and multiple parallel read- and write-operations.

With SUSE Linux Enterprise 12 we are taking the next step in innovation and are using the copy-on-write file system btrfs as the default for the operating system, to support system snapshots and rollback.

Feature Btrfs XFS Ext4 ReiserFS OCFS2
Data Journaling N/A        
Metadata Journaling N/A  
Journal Internal N/A    
Journal External N/A      
Copy on Write N/A N/A N/A N/A
Offline Extend    
Offline Shrink      
Online Extend
Online Shrink        
Sparse Files        
Tail Packing      
Extended Attributes        
Access Control Lists        
Dump and Restore          
Default Blocksize 4 KiB 4 KiB 4 KiB 4 KiB 4 KiB HA
Blocksize Default 4KiB
Max File System Size 16 EiB 8 EiB 1 EiB 16 TiB 4 PiB
Max File Size 16 EiB 8 EiB 1 EiB 1 EiB 4 PiB