In the message dated: Tue, 23 Aug 2011 17:13:00 BST, The pithy ruminations from Alan Brown on <Re: [Bacula-users] How do I force Bacula to unlock a drive? (SCSI Prevent/Allow Media Rem oval)> were: => On 23/08/11 15:59, mark.berg...@uphs.upenn.edu wrote: => => => > The solution in our environment is to use the "sg_prevent" command => > (from the sg3_utils package) to release the SCSI Prevent/Allow Media => > Removal lock: => > => > sg_prevent --allow --verbose /dev/tape0 => > sg_prevent --allow --verbose /dev/tape1 => => This works from a HBA other than the one which set the original lock???
I'm not quite sure what you're asking. As far as I know, the SCSI reservation lock is specific to the combination of the SCSI device (a tape drive) and a server, not to the HBA within the server. The sg_prevent command must be issued from the server that originally locked the drive. I don't know of a way to report on which server issued the SCSI Prevent Media Removal command, so our usual method is to run the "sge_prevent" command on each of the HA nodes that potentially locked the drive. Our servers have multiple fibre cards and paths to storage. For disk storage devices with multiple fibre paths, a single server may use multiple HBAs to access disk storage. However, each fibre tape drive is single-homed, so there's only a single HBA per-server that connects to each tape drive. The tape library has multiple fibre HBAs, but they are specific to tape drives--the library (changer) and each drive are not multipath devices. I'm eager to get information to clear up any of my misperceptions about SCSI reservations. Thanks, Mark ------------------------------------------------------------------------------ Get a FREE DOWNLOAD! and learn more about uberSVN rich system, user administration capabilities and model configuration. Take the hassle out of deploying and managing Subversion and the tools developers use with it. http://p.sf.net/sfu/wandisco-d2d-2 _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users