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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
(x86-64)
IBM z Systems
(s390x)
POWER
(ppc64le)
AArch64
(ARMv8)
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
FD_SETSIZE 1024

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.

+ supported
– unsupported

Feature Btrfs XFS Ext4 OCFS21 ReiserFS2
Support in products SLE SLE SLE SLE HA SLE
Data/Metadata Journaling N/A3 – / + + / + – / + – / +
Journal Internal/External N/A3 + / + + / + + / –
Subvolumes +
Offline Extend/Shrink + / + – / – + / + + / –4 + / –
Online Extend/Shrink + / + + / – + / – – / – + / –
Inode Allocation Map B-tree B+-tree table B-tree u. B*-tree
Sparse Files + + + +
Tail Packing
Small Files Stored Inline + (in metadata) + (in inode) + (in inode)
Defragmentation + + +
Extended File Attributes/ACLs + / + + / + + / + + / +
User/Group Quotas – / – + / + + / + + / +
Project Quotas + +
Subvolume Quotas + N/A N/A N/A
Data Dump/Restore +
Block Size Default 4 KiB5
Maximum File System Size 16 EiB 8 EiB 1 EiB 4 PiB 16 TiB
Max File Size 16 EiB 8 EiB 1 EiB 4 PiB 1 EiB

1 OCFS 2 is fully supported as part of the SUSE Linux Enterprise High Availability Extension.

2 ReiserFS is supported for existing file systems. The creation of new ReiserFS file systems is discouraged.

3 Btrfs is a copy-on-write file system. Instead of journaling changes before writing them in-place, it writes them to a new location and then links the new location in. Until the last write, the changes are not “committed.” Because of the nature of the file system, quotas are implemented based on subvolumes (qgroups).

4 To extend an OCFS 2 file system, the cluster must be online but the file system itself must be unmounted.

5 The block size default varies with different host architectures. 64 KiB is used on POWER, 4 KiB on other systems. The actual size used can be checked with the command getconf PAGE_SIZE.

Additional Notes

Maximum file size above can be larger than the file system's actual size because of the use of sparse blocks. All standard file systems on SUSE Linux Enterprise Server have LFS, which gives a maximum file size of 263 bytes in theory.

The numbers in the above table assume that the file systems are using a 4 KiB block size which is the most common standard. When using different block sizes, the results are different.

In this document: 1024 Bytes = 1 KiB; 1024 KiB = 1 MiB; 1024 MiB = 1 GiB; 1024 GiB = 1 TiB; 1024 TiB = 1 PiB; 1024 PiB = 1 EiB. See also http://physics.nist.gov/cuu/Units/binary.html.

NFSv4 with IPv6 is only supported for the client side. An NFSv4 server with IPv6 is not supported.

The version of Samba shipped with SUSE Linux Enterprise Server 12 SP3 delivers integration with Windows 7 Active Directory domains. In addition, we provide the clustered version of Samba as part of SUSE Linux Enterprise High Availability Extension 12 SP3.