rman备份报错 ORA-19510 ORA-17505 ORA-15041

run{
2> backup incremental level 0 database
3> format '+FRA/db_%d_%U'
4> tag=db_full_inc_0;
5> }
Starting backup at 30-SEP-14
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=982 instance=mpac1 devtype=DISK
channel ORA_DISK_1: starting incremental level 0 datafile backupset
channel ORA_DISK_1: specifying datafile(s) in backupset
channel ORA_DISK_1: finished piece 1 at 01-OCT-14
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ORA_DISK_1 channel at 10/01/2014 07:11:43
ORA-19510: failed to set size of 34982410 blocks for file "+FRA/db_mpac_0kpju2r6_1_1" (blocksize=8192)
ORA-17505: ksfdrsz:1 Failed to resize file to size 34982410 blocks
ORA-15041: diskgroup space exhausted

ASMCMD> lsdg
State Type Rebal Unbal Sector Block AU Total_MB Free_MB Req_mir_free_MB Usable_file_MB Offline_disks Name
MOUNTED EXTERN N N 512 4096 1048576 3583440 568885 0 568885 0 DATA/
MOUNTED EXTERN N N 512 4096 1048576 921456 273296 0 273296 0 FRA/

从报错提示上看是因为空间不够，但是查看空间还剩270多G呀，查阅了很多资料也没中找到具体解决办法，请各位帮忙看看，谢谢谢谢！！

必要采取如下两个步骤来保证今后的备份空间和备份完整性：

1、为了保证备份的完整性，有必要进行重新全备份。虽然list backup方式现显示备份为AVAILABLE，但是空间不足导致的备份日志总是让人放不下心；
2、如果备份存放空间确实紧张，则可以采用Rman的压缩备份参数 AS COMPRESSED BACKUPSET：
backup AS COMPRESSED BACKUPSET database plus archivelog delete all input;另外，如下删除归档日志的参数也值得记录一下了：
RMAN>delete archivelog until time 'sysdate-7';--删除7天前的无用的归档日志
RMAN> crosscheck archivelog all;
RMAN> delete noprompt expired archivelog all;

ORA-15041: diskgroup space exhausted EXTERN redundancy 的diskgroup ，你没告诉我们oracle是说什么版本。 askmaclean oracle 再看看别人怎么说的。