[gpfsug-discuss] AFM Prefetch Missing Files

[Peter Childs]

I know it was said at the User group meeting last week that older 
versions of afm prefetch miss empty files and that this is now fixed in 
4.2.2.3.

We are in the middle of trying to migrate our files to a new filesystem, 
and since that was said I'm double checking for any mistakes etc.

Anyway it looks like AFM prefetch also misses symlinks pointing to files 
that that don't exist. ie "dangling symlinks" or ones that point to 
files that either have not been created yet or have subsequently been 
deleted. or when files have been decompressed and a symlink extracted 
that points somewhere that is never going to exist.

I'm still checking this, and as yet it does not look like its a data 
loss issue, but it could still cause things to not quiet work once the 
file migration is complete.

Does anyone else know of any other types of files that might be missed 
and I need to be aware of?

We are using 4.2.1-3 and prefetch was done using "mmafmctl prefetch" 
using a gpfs policy to collect the list, we are using GPFS Multi-cluster 
to connect the two filesystems not NFS....

Thanks in advanced


Peter Childs