Error received from media manager layer, error text: busy (0:5:2)

Bonjour,

J'ai ce message sur plusieurs de mes sessions RMAN sur plusieurs client NW:

Error received from media manager layer, error text:

   busy (0:5:2)

Versions

Client : 8.2.1.3

Serveur : 8.1.1.6 (Upgrade impossible actuellement)

NMDA : 1.6

Recovery Manager: Release 11.2.0.1.0

Message complet

channel ORA_SBT_TAPE_1: starting piece 1 at 19/10/2015 19:00:23

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

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

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

RMAN-03009: failure of backup command on ORA_SBT_TAPE_1 channel at 10/19/2015 19:04:28

ORA-19506: failed to create sequential file, name="FT_6eqk4cm7_1_1_893530823_20151019", parms=""

ORA-27028: skgfqcre: sbtbackup returned error

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

   busy (0:5:2)

Cela arrive sur plusieurs serveurs...

Merci