Further investigation and checking says 4.2.1 afmctl prefetch is missing
empty directories (not files as said previously) and noted by the update
in 4.2.2.3. However I've found it is also missing symlinks both dangling
(pointing to files that don't exist) and not.
I can't see any actual data loss which is good.
I'm looking to work around this with
find /data2/$fileset -noleaf \( \( -type d -empty \) -o \( -type l \) \)
-printf "%p -> %l\n"
My initial testing says this should work. (/data2/$fileset is the
destination "cache" fileset)
It looks like this should catch everything, But I'm wondering if anyone
else has noticed any other things afmctl prefetch misses.
Thanks in advance
Peter Childs
On 16/05/17 10:40, Peter Childs wrote:
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
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