AFM and AFM DR Limitations

The common limitations for both AFM and AFM DR functions include:

The OS/architecture support matrix is given below:

Table 1. Availability and OS/architecture supported
Arch/OS	Fileset	Supported	Not Supported
Linux for Power Systems™ and x86	AFM SW/IW/RO/LU AFM primary/secondary	Gateway Application Filesystem Manager
Linux on Z	AFM SW/IW/RO/LU AFM primary/secondary	Gateway Application Filesystem Manager
AIX®	AFM SW/IW/RO/LU AFM primary/secondary	Application Filesystem Manager	AIX node as a gateway for AFM/AFM DR fileset and NFS server at home or secondary.

3rd party NFS servers at home/secondary:
- Unsupported for AFM DR secondary.
- Untested for all AFM modes. The IBM Spectrum Scale™ support team will help customers who are using other file systems at home to solve problems directly related to GPFS™ or IBM Spectrum Scale, but will not be responsible for solving problems deemed to be issues with the other file systems.
AIX NFS servers at home/secondary:
- Unsupported for AFM DR secondary.
- Tested and supported for all AFM modes, but running mmafmconfig on the home cluster is not supported, which means, EA's, ACLs, sparseness of files, and psnap will not be supported.
The mmclone command is not supported on AFM cache and AFM DR primary filesets. Clones created at home for AFM filesets are treated as separate files in the cache.
Quality of Service is not tested on AFM and AFM Async DR filesets.
AFM and AFM DR is not tested with IPv6 on gateway nodes.
AFM and AFM DR filesets on Linux on Z is not supported with HSM.
AFM and AFM DR filesets on Linux on Z is not supported with the NSD protocol for communication.
Connecting AFM cache or home or AFM primary or secondary to IBM Spectrum Archive™ is not supported.
Linking of a dependent or an independent fileset is not allowed inside the inode space of any AFM or AFM DR fileset (in other words, linking them under the junction path within the fileset is not allowed).
AFM and Async DR is not supported on clusters that have Windows nodes.
Cascading relationships with AFM caches and AFM primary filesets are not tested.
Fileset snapshot restore is not supported for AFM and AFM DR filesets.
AFM and AFM DR is not supported when SELinux is enabled.
Files in an AFM or AFM DR fileset which are shared by using SMB, an error message E_ACCESS might appear if SMB holds locks on the files. When the locks are released by SMB, AFM replicates again and processes the files from the AFM or AFM DR fileset.