Rman备份到网络共享文件夹报错 rman-03009,ORA-19502,ORA-27063

在AIX下执行mount -v cifs -n 192.168.1.55/username/password -o uid=xxx,gid=xxx,fmode=750 /rman /rman_bksvr之后，调好了win2003的共享权限，在AIX下可以读写挂载目录，touch，cp，rm之类都没有问题~可是在用rman脚本备份的时候却报错，错误如下：

RMAN-03009：failure of backup command on c1 channel at 06/09/2014 15:01:19
ORA-19502:write error on file '/rman_bksvr/lv0_ORCL_4360.dbf',blockno 257 (blocksize=8192)
ORA-27063:number of bytes read/written is incorrect
IBM AIX RISC System/6000 Error: 14: Bad address
Additional information -1
Additional information 1048576
ORA-19502:write error on file '/rman_bksvr/lv0_ORCL_4360.dbf',blockno 1 (blocksize=8192)
ORA-27063:number of bytes read/written is incorrect
IBM AIX RISC System/6000 Error: 14: Bad address

备份脚本如下：
rman << EOF
connect target /
run{
allocate channel c1 type disk;
backup incremental level 0 database format '/rman_bksvr/lv0_%d_%s.dbf';
release channel c1;
}
exit
EOF

以上脚本如果备份到本地没有问题~备份到挂载的共享文件夹就出现上边的报错
共享空间肯定是没问题~还有500G~本地0级备份只有30多G~
也不想用NFS~因为AIX自带cifs支持~NFS还要第三方~还有费用
网上有说rman和cifs不兼容~但是我在自己的VMware workstation上用cifs从linux系统连接本地的win7共享文件夹，rman备份一点问题都没有
望各位大虾多多提点~小虾在此先谢过了