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Backup Exec data path failover

Created: 24 Jan 2014 • Updated: 03 Feb 2014 | 9 comments
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Should it be necessary to restart backup services, or in some cases Windows, when a data path failover takes place?

We have an HP MSL4048 with 2 x LTO5 drives connected by FC to SAN switch. Server also has two FC ports connected to the SAN switch and zoned correctly. We've setup the data path failover as per the manual and from the library's SMU we can see that data path failover works perfectly.

 

Operating Systems:

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CraigV's picture

Hi,

 

No you shouldn't have too. The links should be active/active.

Thanks!

Alternative ways to access Backup Exec Technical Support:

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Tertius's picture

Hi,

We have the HP MSL 4048 and as per the HP Data Path failover setup documentation the links are active passive. Each of the two tape drives has 2 x FC ports. One of the ports are active and logged in to the SAN switch. The other port is passive and on standby. 

Should BE still be able to recover from a failover?

 

CraigV's picture

...the easiest way to know is to start a backup job and then pull the fibre cable that is currently active. This will show you if BE will continue running.

Alternatively you can take a look at the Checkpoint Restart functionality within BE 2012:

http://www.symantec.com/business/support/index?page=content&id=HOWTO74232

http://www.symantec.com/business/support/index?page=content&id=TECH93079

Thanks!

Alternative ways to access Backup Exec Technical Support:

https://www-secure.symantec.com/connect/blogs/alte...

Tertius's picture

Thanks for the info. When I pull out the fibre cable and I can see that the failover happens on the MSL side. The passive port goes active but I need to restart BE services for it to show the drive as online and usable. 

I'm just trying to determine if this is normal behaviour for BE or if I should investigate further.

CraigV's picture

...this would be normal behaviour, that while transparent to Windows won't be transparent to BE at all.

I don't know of many backup applications that would simply carry on running. Might be wrong...

Thanks!

Alternative ways to access Backup Exec Technical Support:

https://www-secure.symantec.com/connect/blogs/alte...

Larry Fine's picture

Should it be necessary to restart backup services, or in some cases Windows, when a data path failover takes place?

Yes, it is required to restart BE services to failover.  When BE sees multiple paths to a device (when it sees the same serial number twice, it assumes there are two paths), it picks one and uses it at that time. If the chosen link fails, the next time BE services start, it will pick the other/working path.  The addamm.log will show when BE sees redundant serial numbers.

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Larry Fine's picture

Can I get marked as the solution please?  I don't know who to ask or how to contact an admin.

If you find this is a solution for the thread, please mark it as such.

CraigV's picture

...if you haven't seen the landing page and the Contact section under it in the time you've been here, you can find it on the link below:

https://www-secure.symantec.com/connect/backup-and-recovery

Amy is very good at responding. Alternatively, simply PM the OP...if they don't answer you have 2 x TAs you can contact who will mark it wink

Thanks!

Alternative ways to access Backup Exec Technical Support:

https://www-secure.symantec.com/connect/blogs/alte...