Taking long time to scan tape << Device could not be opened >> (235 Views)
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Valued Contributor
chindi
Posts: 364
Registered: ‎07-24-2008
Message 1 of 5 (235 Views)

Taking long time to scan tape << Device could not be opened >>

[ Edited ]

Hi ,

 

Its taking long time to scan a tape for first time.

 

Please check below messages ;

 

[Normal] From: BSM@dp-rrb "DAILY_BKP_154_THU" Time: 3/14/2014 5:47:55 PM
Opening MultiPath library control named 'HP:MSL G3 Series' on path 'vishnu;/dev/rac/c34t0d1'.

[Warning] From: UMA@dcrrbdb2 "HP:MSL G3 Series" Time: 3/14/2014 5:52:58 PM
The device "HP:MSL G3 Series" could not be opened("Device could not be accessed")

[Normal] From: UMA@dcrrbdb2 "HP:MSL G3 Series" Time: 3/14/2014 5:52:58 PM
Starting the device path discovery process.

 

Cell manager Win 2008

Unix client      11iv3

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HP Expert
Bob_Clark
Posts: 1,392
Registered: ‎08-14-2013
Message 2 of 5 (200 Views)

Re: Taking long time to scan tape << Device could not be opened >>

You are getting the error:

 

"HP:MSL G3 Series" could not be opened("Device could not be accessed")

 

and then,

 

"Starting the device path discovery process"

 

Did DP find a new device file, then start using it?  If so, this is normal DP behavior when teh device file on the Exchanger or the Drive has changed.  The device file changing is an OS issue, meaning that it is not the same as when you originally configured it.  This can happen if you are in a SAN environment

 

If you are in a SAN environment, I suggest that you enable Persistent Binding on your Network Switch Router (NSR) so that device addresses do not change when a system is rebooted

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Valued Contributor
chindi
Posts: 364
Registered: ‎07-24-2008
Message 3 of 5 (188 Views)

Re: Taking long time to scan tape << Device could not be opened >>

[ Edited ]

Hi Bob,

 

We have installed Multipathing software called Powerpath from EMC on these 11iv3 clients.

Because of which the paths might have changed.

How do we ensure that this scanning doesnt take the same ammount of time always .

 

CM is Win 2008 R2 .

Clients HPUX 11iv3 .

 

How do we enable Persistent Binding on your Network Switch Router (NSR)  ? 

We are using MSL 8096 tape library , DP 7.03 

One more observation is we can see that all clients are configured in hp msl g3 ROBOTICS properties.

Is it necessary to configure all clients ?

Or it must contain only one CM entry in it ?

 

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HP Expert
Bob_Clark
Posts: 1,392
Registered: ‎08-14-2013
Message 4 of 5 (164 Views)

Re: Taking long time to scan tape << Device could not be opened >>

I am not going to be able to give you any information on Powerpath, that is not my area of expertise.  However, if it is possible to turn this off temporarily, it may give you a cluse as to it perhaps causing a problem

 

Similiarly, I know that Persistent BInding can be enabled, but, I don't know how it is done

 

=======

 

One more observation is we can see that all clients are configured in hp msl g3 ROBOTICS properties.

Is it necessary to configure all clients ?

Or it must contain only one CM entry in it ?

 

You can configure as many systems as you want to control the robotics, and using the Data Protector MultiPath functionality

 

Having said that, I don't think that it is a good idea, and I am kind of old-school about this.  My thought is that you just configure the robotics on a single system, if that system happens tgo go down, then it is easy enough to re-configure

 

The drives are a different matter, since backup up over the LAN instead of locally (or over teh SAN) will adversely affect your backup performance

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Valued Contributor
chindi
Posts: 364
Registered: ‎07-24-2008
Message 5 of 5 (160 Views)

Re: Taking long time to scan tape << Device could not be opened >>

Hi Bob ,
After reboot of tape library & Cell Manager all is fine now .
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