pbs qsub - Output showing up in error file

Question

I have code that sshs onto a cluster and does a job (in this case it performs dd to measure file copying speed)

...
job='some_job'
log='/home/logs' # where out and err is saved
cmd="dd if=/dev/zero of=${file} bs=1G count=1 oflag=dsync"

ssh cluster "source .cshrc; echo $cmd | qsub -V -hard -l 'mem_free=2.0G,h_vmem=2.0G' -cwd -N $job -o $log'.log' -e $log'.err'"

The job works, however the output I want is somehow redirected to the .err file when I want it in the .log file.

some_job.log:

Warning: no access to tty (Bad file descriptor).
Thus no job control in this shell.

some_job.err:

1+0 records in
1+0 records out
1073741824 bytes (1.1 GB) copied, 77.7467 s, 13.8 MB/s

Not sure what to change since I explicitly indicate in the script the file locations with the -e and -o options.

Answer 1

So as trivial as it seems the message I'm looking for is indeed considered as stderr. Due to the semantics of what I expected output to be, I thought this was incorrect.

Though this is the 'answer', I would appreciate any comments explaining these semantics (why the copying speeds are printed as stderr).