Unbelievably i have seen this yesterday as a windows guy asked me if i 
knew about it seeing as i support Netbackup on solaris.

The fix he got which worked was to disable the Removable storage manager 
service. The errors are no more.

That was on a windows 2003 setup with netbackmup 5.1 mp4

Roger Dombrowski wrote:

> Hi Blaine,
>
> I have been looking to try and solve this problem for two sites that 
> I'm working with right now
> and we're not having much luck either.  In my travels I've talked to a 
> few folks that have seen
> this "External Event" issue caused by monitoring software. One client 
> in particular found that one
> of Sun's monitoring tools was sending out scsi inquiries and causing 
> the "external event rewinds".
>
> I also ran across a post on this mailing list that documents about 30 
> such applications that have
> been known to cause this type of behaviour.  Try searching this list 
> for "external event". If a get
> a chance, I'll try and dig it up and send you the post I'm thinking of.
>
> Through the course of my research I've basically found that two things 
> are trying to communicate
> with the drive and most folks check out the data path (hba's, 
> switches, bridges,...) to look for problems.
>
> Maybe the upgrade stepped on some scsi reservation setting. If I find 
> anything else, I'll post to the
> list...
>
> Blaine Robison wrote:
>
>> I am having a similar issue. I have a windows 2000 master and a pair 
>> of sun
>> 480's with 8 LTO2 drives shared between them. I get External Event 
>> caused
>> rewind error and the tapes get frozen or the drives go down. I didn't 
>> have the
>> problem unti lI upgraded to 5.1 MP4. I have gone over the entire 
>> configuration
>> and cannot find a problem.
>> Has anyone else seen this and found a resolution?  
>> --- ida3248b AT post.cybercity DOT dk wrote:
>>
>>  
>>
>>> Have you tried /var/adm/messages (Solaris) or the equivalent log ?
>>>
>>> Regards
>>> Michael
>>>
>>> On Wed, 18 Jan 2006 15:00:24 +0000, Dave Markham wrote
>>>   
>>>
>>>> I have 1 master server, and 2 media servers connected over fiber to 
>>>> an L700. Im not sure what the switch in the middle is as didnt 
>>>> install the system or have any info on it.
>>>>
>>>> There are 5 drives in the L700 and 3 of them are shared with sso 
>>>> option to the master, and both media servers.
>>>>
>>>> People i have had an issue lately with drives being not visible to 
>>>> one of my media servers.
>>>>
>>>> I have fixed this by unloading the fibre hba using cfgadm and 
>>>> loading it again. It then can see the devices under sgscan and has 
>>>> seen them under /dev/rmt
>>>>
>>>> I also noticed the customer had removed a /etc/hosts entry for the 
>>>> media servers to talk to each other by the correct name so i put 
>>>> that back in and can now talk on port 13701 to each machine in the 
>>>> nbu setup.
>>>>
>>>> Whats happening now though is drives just keep going down on the 
>>>> media servers and backups are not working. I have ITC enabled so 
>>>> each media server needs to lock 2 drives.
>>>>
>>>> I have looked the bptm logs and cant see anything jumping out apart 
>>>> from many request medias of different tape ids. I have looked in 
>>>> /usr/openv/volmgr/debug/ltid/ and the logs in their show 
>>>> successfully on communicating shared drive info to the master.
>>>>
>>>> Therefore i am now stuck and have no idea whats going wrong :(
>>>>
>>>> Anyone any advice/pointers? Is ether anything specific i should be 
>>>> looking for in the logs or are there other important logs im not 
>>>> checking.
>>>>
>>>> Thanks
>>>> _______________________________________________
>>>> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
>>>> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>>>>     
>>>
>>> -- 
>>> Cybercity Webhosting (http://www.cybercity.dk)
>>>
>>> _______________________________________________
>>> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
>>> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>>>
>>>   
>>
>>
>>
>> Blaine Robison
>> Solaris Ceritfied System Administrator Solaris Certified Network 
>> Administrator
>> Veritas Certified Professional
>> 972-853-2459
>> 214-578-5391
>>
>> __________________________________________________
>> Do You Yahoo!?
>> Tired of spam?  Yahoo! Mail has the best spam protection around 
>> http://mail.yahoo.com _______________________________________________
>> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
>> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>>
>>  
>>
>
>