ANS1312E (RC12) Server media mount not possible

一客户TSM备份失败，报如下错误：

RMAN-00571: ===========================================================

RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============

RMAN-00571: ===========================================================

RMAN-03009: failure of backup command on t1 channel at 07/08/2009 03:04:12

ORA-19502: write error on file “bk_9060_1_691642987″, blockno 1 (blocksize=512)

ORA-27030: skgfwrt: sbtwrite2 returned error

ORA-19511: Error received from media manager layer, error text:

ANS1312E (RC12)   Server media mount not possible

从字面上来看，应该是TSM跟带库连接有问题，检查TSM的备份日志，发现这样的错误：

07/08/2009 03:02:25 AM   ANR8840E Unable to open device /dev/IBMchanger0 with error  2. (SESSION: 130)

07/08/2009 03:02:25 AM ANR8441E Initialization failed for SCSI library SHARELIB.  (SESSION: 130)

07/08/2009 03:02:25 AM   ANR1401W Mount request denied for volume ZY8585L3 - mount failed. (SESSION: 130)

07/08/2009 03:02:45 AM  ANR8840E Unable to open device /dev/IBMchanger0 with error  2. (SESSION: 130)

07/08/2009 03:02:45 AM   ANR8441E Initialization failed for SCSI library SHARELIB.  (SESSION: 130)

07/08/2009 03:02:45 AM  ANR1401W Mount request denied for volume ZY8585L3 - mount  failed. (SESSION: 130)

07/08/2009 03:02:45 AM  ANR0525W Transaction failed for session 130 for node  SZ-DB-SRV (TDPO LinuxAMD64) - storage media inaccessible.

检查TSM Server上的/dev目录，没找到跟IBM带库有关的设备，检查系统日志，发现在6日服务器有重启过，询问对方工程师，确认6日机房有断电过，造成server重启。因此tsm无法访问带库很有可能是由于断电引起的，于是重启带库及tsm服务器，然后手工执行备份，经测试，备份正常。