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MSL2024

Geraerds Marcel
Occasional Visitor

MSL2024

We've recently bought a MSL 2024 with Ultrium 920 drives. We need to connect one drive to Server 1 and the other drive to Server 2. We also bought 2 LSI SCSI controllers with support of LUN scanning. We've installed one tape-unit to server 1 and it works like a charm. Now I'm trying to install te second unit to server 2. It sees the tape-unit but not the Library / Medium Changer.

Library Hosted by Drive 2 ==> Which is the drive connected to server 1. When I change it to Drive 1, the medium changer is visible on Server 2 but no longer on server 1.

What am I forgetting / doing wrong.

Any help is much appreciated!

Thanx,

Marcel
12 REPLIES
Geraerds Marcel
Occasional Visitor

Re: MSL2024

We are using Symantec Backup Exec 11d, Windows Server 2003 x32, all latest service packs!
Víctor Cespón
Honored Contributor

Re: MSL2024

Eing? Where do you have seen that you can connect a SCSI library to two different SCSI controllers at the same time?
TapeDrive Killer
Trusted Contributor

Re: MSL2024

Thats not possible the only device that would see the media changer is the master drive thats it. You can probabli join the domain server that way you can backup both servers or use RMI to manually load tape cartridges.
One drink away from sleeping on the pavement
TapeDrive Killer
Trusted Contributor

Re: MSL2024

Also you need to change the library mode to RANDOM or you will lost the comunication with the media changer at some point
One drink away from sleeping on the pavement
Geraerds Marcel
Occasional Visitor

Re: MSL2024

The reseller told me it could be connected to 2 different servers (It's one library with 2 tape-drives (Ultrium 920)) if we used the same Backup-software on the two servers (which we are).
TapeDrive Killer
Trusted Contributor

Re: MSL2024

yes but only 1 server will be able to see the media changer let me do a reseach
One drink away from sleeping on the pavement
Geraerds Marcel
Occasional Visitor

Re: MSL2024

Thanx Pablo.
I specifically asked for this kind of solution. The guaranteed me that the library and 2 drives could work simultaniously on the 2 different servers!
I'll contact them aswell in the morning. Hope it's small config, took me 3 weeks to find a time-window to install the HBA in the second server :-(
Víctor Cespón
Honored Contributor

Re: MSL2024

Are you sure that the reseller did not mean that it can be used by 2 servers after you connect it to a NSR and access it though fiber channel?
That's the way a tape library is shared usually.
Geraerds Marcel
Occasional Visitor

Re: MSL2024

What's a NSR?
TapeDrive Killer
Trusted Contributor

Re: MSL2024

Network Storage Router thats if you are using Fibre
One drink away from sleeping on the pavement
Curtis Ballard
Honored Contributor

Re: MSL2024

Your reseller forgot to tell you one critical point.

The configuration you use works great and is fully supported by HP -- If your ISV software supports that mode --.

This model typically requires backup software where there is a single master server and multiple media agents can be installed on different servers. The media agents all send mount/dismount requests back to the master server.

I don't know enough about BE to say whether it supports this mode but it certainly won't work as two different installations.
Mark Cannistraci
Occasional Visitor

Re: MSL2024

I can tell you that Backup Exec dosen't support that kind of configuration. I think what your reseller meant was that you can backup data from 2 servers at the same time. This would be done through the backup jobs.

Here's what I would do:
With 2 drives, you need a LEO (Library Extension Option) license for the second drive. BE won't be able to use the second drive until you have this installed. Once that is installed you need to create 2 seperate backup jobs. For simplicity I'm assuming that you have your RAWS pushed out to the clients.
OK, this is simple.
Job 1 backs up to Drive 1. and Job 2 backs up to drive 2.
You select which job goes to which drive based on your data storage needs.
In this config, you don't have to set partitioning on the library and both servers get backed up to seperate drives.

There is no way to connect the second drive to a seperate server and have the library know about it since both drives are controlled by the library and not the servers you are trying to connect them to. Only one server can be connected to the library. I would suggest that you connect the library to a dedicated backup server and run the jobs seperately to each drive.
You could go one step further and partition the library (without a mail slot) so that each half of the library is only used for the specific job.
i.e. Job 1 - Drive 1 - Partition 1.
Rinse and repete with job 2.

It may not be the right combo for you. you are the one that is going to have to figure that out!
Good Luck and let us know what you came up with!