As for the 'hanging' when copying large amounts of data, I read of a similar problem someone had on the Arch forums which I believe was eventually solved by turning off defragmentation in transparent hugepages.
One quick way to see if it's related to transparent hugepages would be to add 'transparent_hugepage=never' to your kernel boot parameters and then start copying large amounts of data to see if it still hangs.
Ah, thanks for the tip - Next time, i plan on doing a huge transfer - if it still hangs (on 3.4-rt), i will try this out and see if it makes a difference. Luckily, it is rare that i need to back up 300gig of data.
Originally Posted by XorEaxEax