When backing up archive logs also often became an error SDT PIPE. The task goes to pending status, you can click the resume and the task will be completed, but this error will be in the log file:
RMAN-03009: failure of backup command on ch5 channel at 05/13/2019 15:01:15
ORA-19502: write error on file "1285784_PROGNOZ_tmu1es8u_1_1", block number 121345 (block size=512)
ORA-27030: skgfwrt: sbtwrite2 returned error
ORA-19511: non RMAN, but media manager or vendor specific failure, error text:
sbtwrite2: Job thread: Unable to write DATA buffer.
channel ch5 disabled, job failed on it will be run on another channel
This error occurs for different media agent servers and database servers.