What to do against QFS metadata lag?

I am using Sun QFS as shared cluster filesystem for a farm of content upload servers (Aspera).
When testing the failover functionality, I found out that files written on one cluster node sometimes take 1-2 minutes until they show up on the other nodes.
This is rather unacceptable as I can't predict on which node the restarted connection will hit, and thus I end up with an awful lot of inconsistent files.
e.g. I create a new file "test.txt" on one note, and write some text into it.
One of the other nodes does not show the new file in 'ls' at all,
another node shows it in 'ls', but a cat on it returns &#%@^} random foo instead of the real content.
Then I wait a minute, and the file is visible on all nodes and cats correctly.
I have mounted the FS according to the whitepapers with the sync_meta option, but this did not change anything.
qfstransfer - /transfer samfs - yes rw,stripe=1,shared,bg,*meta_timeo=0,sync_meta=1*
Are there any useful methods to further tune the metadata synchronization between the cluster nodes and the MDC?
I wouldn't mind losing a few percent of throughput due to additional metadata traffic, as long as it ensures better consistency.
The cluster nodes are Solaris 10 x86 on HP Blades, the MDC is Solaris 10 sparc on a T5220, currently running QFS 4.6.3, but soon upgrading to 5.x

man mount_samfsLook at the "cattr" mount option.

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