Write failed flushing stdout buffer.

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           3 100%    0.00kB/s    0:00:00
wrote 30496 bytes  read 327051 bytes  14593.76 bytes/sec
total size is 419896352  speedup is 1174.38
Write failed flushing stdout buffer.
write stdout: Broken pipe

time /usr/local/bin/rsync -avzP host: /bkup-zone --delete

this is the command which is being run, and I get the above error message
everytime. The phenomenon doesn't happen when just copying certain
directories, but only when I do the full backup (size approx 126M).

rsync  version 2.5.1  protocol version 25

help appriciated, i've checked everywhere for answers.

Daniel