Appendix B. Filesystem and Logical Unit Specifications
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Appendix B. Filesystem and Logical Unit Specifications

Table B-1 summarizes filesystem and logical unit specifications differences among the supported client-only platforms.

Table B-1. Filesystem and Logical Unit Specifications

Item

AIX

IRIX

Linux x86_64

Linux ia64

Mac OS X

SGI ProPack

Solaris

Windows

Maximum filesystem size

264 bytes [a]

264 bytes

264 bytes

264 bytes

264 bytes

264 bytes

264 bytes

264 bytes

Maximum file size/offset

16 TB [b]

263-1 bytes

263-1 bytes

263-1 bytes

263-1 bytes

263-1 bytes

263-1 bytes

263-1 bytes

Filesystem block size (in bytes)[c]

4096 (XFS default)

512, 1024, 2048, 4096, 8192, 16384, 32768, or 65536

512, 1024, 2048, or 4096

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

4096, 8192, 16384, 32768, or 65536

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

2048, 4096, 8192, 16384, 32768, or 65536 [d]

512, 1024, 2048, 4096, 8192, 16384, 32768, or 65536

XVM device block size (in bytes)

512

512

512

512

512

512

512

512

Physical LUN limit for DVH-labeled disks

2 TB

2 TB

2 TB

2 TB

2 TB

2 TB

1 TB

2 TB

Physical LUN limit for GPT-labeled disks [e]

2 63 device blocks

2 63 device blocks

2 63 device blocks

2 63 device blocks

2 63 device blocks

2 63 device blocks

2 63 device blocks

2 63 device blocks [f]

Maximum concatenated slices

65536 [g]

65536

65536

65536

65536

65536

65536

65536

[a] About 18 million terabytes

[b] Assumes the default ulimit is changed, see “Limitations and Considerations for AIX” in Chapter 3.

[c] 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.

[d] 8192 is recommended

[e] 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.

[f] CXFS cannot access GPT labels for Windows 2003 x86 and Windows XP x86.

[g] 65536 concatenated slices is 130 PetaBytes


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Appendix A. Operating System Path Differences  Appendix C. Mount Options Support