Snapshot throttle limit problem

Hi,

I have 12 elasticsearch nodes, with 10gb eth

Ive been having alot of problem with the performance of snapshots, its throttles to 20 mb/s even tho i set max_snapshot_bytes_per_sec to something else, ive tried to set it in bytes, in megabytes (500m, 500mb)

Ive tried to move 100gb file from elastic-node to my nfs-server, its about 1gb/s
Ive tried to move 100gb file from elastic-node down to my share, its about 1gb/s
Ive tried to just cp -rp my index from elastic-node to my share, its about 1gb/s

Am i missing something here? How is the max_snapshot_bytes_per_sec suppose to look like?
Are there any other settings (like recovery streams etc) that affects this?

My backup dir:
curl -XPUT 'http://localhost:9200/_snapshot/my_backup' -d '{
"type": "fs",
"settings": {
"location": "/misc/backup_elastic/snapshot",
"compress": true,
"verify": true,
"max_snapshot_bytes_per_sec" : "1048576000",
"max_restore_bytes_per_sec" : "1048576000"
}
}'

And snapshot:
curl -XPUT "localhost:9200/_snapshot/my_backup/snapshot_test" -d '{
"indices": "index-2014-01-03",
"ignore_unavailable": "true",
"include_global_state": "true",
"partial": "true"
}'

Regards, Johan