You xserve should be able to sustain over 120 mb second.
Aja control room dropped frames.
Aja control room is unified cross platform software for ingest playback and output with aja products.
I was able to get 8k output to display from premiere pro but it dropped frames during prores playback even at 24p.
You should not be experiencing dropped frames.
Whether you re using tape files on a network or broadcast ip you now get the same smooth interface on macos windows or linux offering an elegant ui aja control room supports aja s latest desktop i o products enabling capture.
Double check under the fcp systems settings to be sure that the xserve is set as your scratch disk.
Aja control room is professional media software for macos windows and linux enabling 8k 4k hd sd workflows in numerous powerful ways.
Optimized aja control room monitor display during capture to free resources for high resolution high frame rate encoding fixed audio stuttering in adobe premiere pro when premiere pro drops frames fixed dropped frames in apple fcp7 timeline playback with io 4k.
According to aja s data rate calculator 8 bit uncompressed is about 28 mb second.