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 http://www.symantec.com/docs/TECH139741|
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.
Article URL http://www.symantec.com/docs/TECH139741