rsync File too large (27)

[Juan Andres Ramirez]

Hola Listeros:
       Mirando los logs de la copia diaria de mi server de correo, me
encontre que una cuenta /var/spool/mail/cuenta, no se pudo copiar:

rsync -agEvz --delete-after /var/spool/mail .


rsync: write failed on "/mnt/HDD_Externo/mail/usuario": File too large (27)
rsync error: error in file IO (code 11) at receiver.c(252) [receiver=2.6.8]
rsync: connection unexpectedly closed (5835 bytes received so far) [generator]
rsync error: error in rsync protocol data stream (code 12) at
io.c(463) [generator=2.6.8]
rsync: connection unexpectedly closed (1928 bytes received so far) [sender]
rsync error: error in rsync protocol data stream (code 12) at
io.c(463) [sender=2.6.8]

Asi que mire cuanto pesaba:
[root en mail mail]# ls -lh /var/spool/mail/cuenta
-rw-rw----  1 cuenta mail 5.5G Apr  3 13:47 /var/spool/mail/cuenta

Esta copia la realizo a un Hdd externo USB:

Disk /dev/sdc: 122.9 GB, 122942324736 bytes
255 heads, 63 sectors/track, 14946 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1       14946   120053713+  83  Linux

Bueno, el error se debe a algo que estoy haciendo mal??, cualquier
indicación se los agradecería mucho. Gracias.