SCSI reservation conflict on tape device between NDMP storage unit and media server storage unit.

Article:TECH139741  |  Created: 2010-09-14  |  Updated: 2013-12-20  |  Article URL
Article Type
Technical Solution


Although backups are working successfully, some SCSI reservation conflict messages are being logged in the /var/adm/messages file on a Solaris media server.  What is the root cause of these messages ?



Wed Aug 25 21:48:07 SGT last message repeated 3 times
Wed Aug 25 21:48:08 SGT [XXX-Filer01: tapemc.device.resvConfl:error]: Reservation conflict on tape device sg_xxx_xxxx01:29.126L5.
Wed Aug 25 21:48:08 SGT last message repeated 2 times
Wed Aug 25 21:48:27 SGT [XXX-Filer01: tapemc.device.resvConfl:error]: Reservation conflict on tape device sg_xxx_xxxx01:29.126L4.  


Media Server Solaris 10 Netbackup 6.5.5 using SSO (Shared Storage Option).
Netapp NDMP Filer Ontap 7.2.1
I2K library fibre attached

The I2k library tape devices are presented to a Solaris media server and a Netapp NDMP filer.


The media server is logging SCSI reservation conflict messages due to a conflict when trying to acquire a SCSI reservation on a shared device. The cause of the reservation conflict was because the Filer had SCSI persistent reservation configured but the Media server has SCSI-2 reserve/release configured. 


When using SSO, shared devices require the same level of SCSI reservation. The default SCSI reservation configured within Netbackup is SCSI-2 reserve/release. The solution is to either configure SCSI-2 reserve/release on the Filer or to configure persistent reservation within Netbackup.

ONTAP 7.1 release supports SCSI Reserve/Release commands for the Shared Storage Option of Symantec VERITAS NetBackup 6, which allows users to dynamically share tape devices with NDMP backup policies. To enable the SCSI Reserve/Release commands, set the "tape.reservations" option to 'scsi'  . 

Open command window on the filer

Filer> options tape.reservations scsi

Valid values are off, scsi, or persistent. For more information, see na_options(1) man page.



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