failed to archive

[AK]

I see a lot of "failed to archive " messages in alert.log . But finally the log gets archived . Is it due overloaded archiver ?   this is from alert log.....   ARC0: Beginning to archive log# 3 seq# 87568 ARC0: Failed to archive log# 3 seq# 87568 ARC0: Beginning to archive log# 2 seq# 87569 Mon Jul 14 11:36:23 2003 ARC4: Completed archiving log# 3 seq# 87568   -ak   ocp dba 8i