As per activity monitor backups fialed with ec-24
3/26/2015 17:44:22 - Info bptm (pid=9464) start
03/26/2015 17:44:22 - Info bptm (pid=9464) using 262144 data buffer size
03/26/2015 17:44:22 - Info bptm (pid=9464) using 32 data buffers
03/26/2015 17:44:29 - Info bptm (pid=9464) start backup
03/26/2015 17:44:30 - Info bptm (pid=9464) backup child process is pid 9468
03/26/2015 17:44:30 - begin writing
03/26/2015 18:41:43 - Critical bpbrm (pid=9463) from client gaalpa1ecmwga23.itservices.sbc.com: FTL - socket write failed
03/26/2015 18:41:43 - Error bptm (pid=9468) system call failed - Connection reset by peer (at child.c.1306)
03/26/2015 18:41:43 - Error bptm (pid=9468) unable to perform read from client socket, connection may have been broken
03/26/2015 18:41:44 - Error bptm (pid=9464) media manager terminated by parent process
03/26/2015 18:41:57 - Error bpbrm (pid=9463) could not send server status message
03/26/2015 18:41:57 - Info bpbkar (pid=10276) done. status: 24: socket write failed
03/26/2015 18:41:57 - end writing; write time: 0:57:27
03/26/2015 18:42:01 - Info bpbrm (pid=16421) Starting delete snapshot processing
03/26/2015 18:42:03 - Info bpfis (pid=7928) Backup started
03/26/2015 18:42:03 - Critical bpbrm (pid=16421) from client gaalpa1ecmwga23.itservices.sbc.com: FTL - cannot open C:\Program Files\Veritas\NetBackup\online_util\fi_cntl\bpfis.fim.gaalpa1ecmwga23.itservices.sbc.com_1427409853.1.0
03/26/2015 18:42:03 - Info bpfis (pid=7928) done. status: 4207
03/26/2015 18:42:03 - Info bpfis (pid=7928) done. status: 4207: Could not fetch snapshot metadata or state files
socket write failed (24)
For few GB data backups getting good after that failed with above error please suggest.