Appendix G. Filesystem Specifications
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Appendix G. Filesystem Specifications

The following table lists filesystem specifications for Linux running on a server-capable administration node.

Item

Description

Maximum filesystem size

264 bytes

Maximum files size/offset

2 63-1 bytes

Filesystem block size (in bytes)[a]

512, 1024, 2048, 4096, 8192, or 16384

XVM device block size (in bytes)

512, or greater than 512 for Linux kernels 2.6.32 or later (XVM on Mac OS X and Windows clients only supports 512 byte block sizes)

Physical LUN limit for DVH-labeled disks

2 TB

Physical LUN limit for GPT-labeled disks[b]

2 63 device blocks

Maximum concatenated slices

65536

[a] If the filesystem is to be accessible by other platforms in a multiOS cluster, its block size must be supported on all platforms in the cluster

[b] Note the following about physical LUN limits for GPT-labeled disks:

  • Physical LUNs with GPT labels are not constrained by XVM or CXFS to be smaller than the largest possible filesystem.

  • Cluster nodes may constrain the LUN size to be smaller due to driver or other operating system constraints. A LUN used in the cluster may not be larger than the maximum size allowed by any node.

  • All nodes that mount a filesystem using LUNs larger than 2 TB must be upgraded to CXFS 4.2 or later.


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Appendix F. Migration from a Cluster with IRIX® Server-Capable Administration Nodes  Appendix H. mkfs Options and CXFS