PDSERVICE's blog

oerr ora 376
00376, 00000, "file %s cannot be read at this time"
// *Cause:  attempting to read from a file that is not readable. Most likely
//          the file is offline.
// *Action: Check the state of the file. Bring it online

The named tablespace contains an active rollback segment as named
in the error.

Actions:

1. Offline the named rollback segment:
eg: ALTER ROLLBACK SEGMENT  OFFLINE;

2. Re-attempt to offline the tablespace

ORA-1545 may be signalled during a "DROP ROLLBACK SEGMENT" if the
rollback segment is currently online.
eg: SVRMGR> drop rollback segment rprbs;
drop rollback segment rprbs
*

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DBA_ROLLBACK_SEGS entry of status "NEEDS RECOVERY"
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The DBA_ROLLBACK_SEGS view shows a rollback segment as "NEEDS RECOVERY"

[oracle@ocp2 ~]$ oerr ora 1545
01545, 00000, "rollback segment '%s' specified not available"
// *Cause: Either:
//         1) An attempt was made to bring a rollback segment online that is
//            unavailable during startup; for example, the rollback segment

PROBLEM:

ASM communication error has been reported by RDBMS which is leading to 

This environment is using secure file. There is no backup due to customer

this happened 3 times  on 3 different archivedlogs in a recent recovery.