Netbackup之前备份RAC数据一直都非常正常，突然这几天出现异常：
channel ch00: starting piece 1 at 2013-11-24:18:02:32
released channel: ch00
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on ch00 channel at 11/24/2013 18:03:17
ORA-19506: failed to create sequential file, name="bk_20131124_u0boppfpn_s2059_p1_t832356151", parms=""
ORA-27028: skgfqcre: sbtbackup returned error
ORA-19511: Error received from media manager layer, error text:
VxBSACreateObject: Failed with error:
Server Status: Communication with the server has not been initiated or the server status has not been retrieved from the serve
RMAN>
Recovery Manager complete.
检查磁带空间， 可以正常MOVE，而且另外机器负责文件型的备份一直没有问题，排除磁带机问题；
磁带还有剩余空间，且Oracle池中还有另外一个磁带，不存在空间不足问题。
再检查备份任务：
2013/11/26 12:35:01 - Info bpbrm(pid=3812) dbrac01 is the host to backup data from
2013/11/26 12:35:01 - Info bpbrm(pid=3812) reading file list from client
2013/11/26 12:35:02 - Info bpbrm(pid=3812) listening for client connection
2013/11/26 12:38:29 - Info nbjm(pid=4392) starting backup job (jobid=4706) for client dbrac01, policy otest, schedule Default-Application-Backup
2013/11/26 12:38:29 - Info nbjm(pid=4392) requesting STANDARD_RESOURCE resources from RB for backup job (jobid=4706, request id:{0BC443C1-FEAE-4467-9D11-4779578CFFFA})
2013/11/26 12:38:29 - requesting resource dbrac01-hcart2-robot-tld-0
2013/11/26 12:38:29 - requesting resource win2008nbu.NBU_CLIENT.MAXJOBS.dbrac01
2013/11/26 12:38:29 - requesting resource win2008nbu.NBU_POLICY.MAXJOBS.otest
2013/11/26 12:38:31 - granted resource win2008nbu.NBU_CLIENT.MAXJOBS.dbrac01
2013/11/26 12:38:31 - granted resource win2008nbu.NBU_POLICY.MAXJOBS.otest
2013/11/26 12:38:31 - granted resource T722L5
2013/11/26 12:38:31 - granted resource IBM.ULT3580-TD5.000
2013/11/26 12:38:31 - granted resource dbrac01-hcart2-robot-tld-0
2013/11/26 12:38:31 - estimated 0 Kbytes needed
2013/11/26 12:38:31 - Info nbjm(pid=4392) started backup (backupid=dbrac01_1385440711) job for client dbrac01, policy otest, schedule Default-Application-Backup on storage unit dbrac01-hcart2-robot-tld-0
2013/11/26 12:38:33 - started process bpbrm (3812)
2013/11/26 12:38:33 - connecting
2013/11/26 12:38:34 - end writing
cannot connect on socket(25)
并未mount磁带就结束了，是OS问题？
检查操作系统，结果发现C盘的可用空间为0： C盘分配80GB，为系统盘，只安装OS，发现页面文件占了近70GB，C盘空间完全用完，问题应该在此了。
调整页面文件分配，再次启动机器这台机器，手动备份Oracle库正常。