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ESL9000 tape drive problem

ESL9000 tape drive problem

We are using 16 SDLT320 drives attached through NSR. We use MDMS and ABS for managing backup.
During the backup , the drives seemingly go offline due path disconnects and have to abort the batch job that runs the backup and restart.

1. The batch job issues a mount request for second volume
2. I mount a free volume through MDMS and reply to the request with mounted
3. Job keeps repeating the request
4. Log file says "medium is offline " When I check the drive, it shows disconnected paths
Questions :
What am I doing wrong ?
Is it possible to set the path and not use multipath

We are on VMS 8.3 on GS1280.



Please see the attached text file.
4 REPLIES
Wim Van den Wyngaert
Honored Contributor

Re: ESL9000 tape drive problem

I know nothing but found this in the 8.2 notes. Is your tape drive mscp served ?

failover between direct and MSCP-served paths is not supported for tape devices (unlike multipath failover between direct and MSCP-served paths for SCSI and Fibre Channel disks introduced in this release).

fwiw

Wim
Wim
Wim Van den Wyngaert
Honored Contributor

Re: ESL9000 tape drive problem

Ignore that post. You don't have mscp.

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00775232/c00775232.pdf
says that ETLA drives don't support mult-path failover (search for etla). That's in contrast with all docs saying that VMS can handle it starting from 7.3-1.

Confusing

Wim
Wim

Re: ESL9000 tape drive problem

I am thinking of forcing the tape drive to use only one path by issuing the following command
set device/noenable/path=xyz device:

Would this work for tape device ? Are there any other issues that may crop up. Perhaps I can set this before starting the backup and then enable it after the backup is completed.

( from VMS help )
SET

DEVICE

/ENABLE

/ENABLE
/NOENABLE

Enables or disables a path to a multipath device; the affected
path is the one named in the /PATH qualifier. All paths are
initially enabled; the current path cannot be disabled.

Rob Leadbeater
Honored Contributor

Re: ESL9000 tape drive problem

Hi James,

Is it possible that there are other hosts on the SAN that are accessing the library, which could be causing VMS to confused ??

Cheers,

Rob