How do you “share” a 3583 tape library between two AS/400 systems?

2740 pts.
Tags:
BRMS
IBM Ultrium 3580
Tape drives
Tape libraries
V5R4
V6R1
What do you need to configure to be able to share a 3583 tape media library between two systems using BRMS? System A is running V5R4, System B is V6R1. Have BRMS with the network feature on each. Two tape drives in the 3583. Fiber channel connections through a SAN switch. Network feature works fine, Tape inventory, media classes, locations, containers all appear on both systems. 

Current issue is that each system only recognizes ONE tape drive - unfortunately both only recognize drive #1 in the lib - so tape operations cannot run simultaneously between systems. Drive #2 reports in under a different IOP but is not accessable.

Have been running BRMS on one system for five years, just added the second system. Can run backups by staggering start times (system B starts after system A ends).

Have an open PMR with IBM service on this - problem of course is finding someone who knows BRMS, 3583 media libraries and how they all fit together. 

Thanks!

Mike



Software/Hardware used:
9406-570 with V5R4. 8203-E4A with V6R1, BRMS, 3583 Tape Media Library

Answer Wiki

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I installed a 3573 L4U (2 tape drives) over a year ago and is currently shared between two systems. Each system is configured for its own drive, 1 & 2. Are you going through the browser interface to configure your 3583? Check under Configure Library how its setup, two logical libraries, drives, etc.

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  • mcl
    Due to network restrictions I can not access the RMU via a browser. I'm guessing that what you refer to as "two logical libraries" is the same as two library partitions? Each system sees the library and both drives. Drive #1 shows up as the resource under the library on both systems. Realistically, you want to see both drives on each system to be able to do things like tape duplications or parallel backups. The library has partitioning turned ON and control paths ON. I have not "partitioned" the library - to do that you have to move drive 2 to say position #4. The problem with partitioning the library is that it physically divides the storage. IBM (BRMS support) isn't quite sure that is the way to go even though one of the 3583 support folks said to so it. The other problem with partitioning is that you can't have a "pool" of scratch tapes that can be used by either system - and - my eventual plan is to be able to maintain a 30 day set of backup copies in the library. Partitioning would prevent that. IBM is telling me I should see (under the IOA) the library and directly below that the two drives. What I'm seeing is one drive under the library and the second drive under a different IOA. I might have to IPL the IOP but I can't on one system because it also has the primary ethernet NIC... Regards Mike
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  • Lovemyi
    The way to set this up is to Zone the Fiber SAN Switch where system A sees tape 1 and tape 2 and then another Zone where system B sees tape 1 and tape 2. The iSeries will automatically configure the tape library on each system with 2 tape drives. For BRMS you configure the tape library as the media device instead of the tape drive name and then the backup will kick off and if tape drive 1 is busy it will hope down to tape drive 2 on each system. Let the tape library TAPMLB01 or what ever it creates it as. We actually rename it to TAPLTO and then point the resource name that is assigned to the tape library to the TAPLTO tape library device. Hope this helps. I do it for 6 tape drives on 9 lpars and each lpar can access all 6 drives if they are available. Lovemyi
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  • mcl
    I like the idea of zoning the SAN switch. Just not sure how to proceed with that. Right now, each system has two FC adapters. We have two SAN switches. Each adapter is connected to a switch. One switch is connected to drive 1 and one switch is connected to drive 2. So, each switch has three connections. Should I only be using one SAN switch? And if so, would I have only one FC adapter from each system connected to it? The library is configured as a media device using the "default" name TAPMLB01 and operations specify TAPMLB01.
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  • Lovemyi
    Mcl, you only need one SAN switch with at least 4 ports. Port 1 - iSeries A, Port 2 - iSeries B, Port 3 - TAPE 1 and Port 4 - Tape 2. In the SAN Switch software configure Zone 1 to be Port 1, 3 and 4 and Zone 2 to be Port 2, 3 and 4. this way each iSeries will see 2 tape drives. We have 16 ports with 6 Tape Drives in the library and 10 iSeries all zoned this way and it works great. Lovemyi
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  • mcl
    That make sense. We have a 16 port SAN switch - so no issues there. Any special configuration on the AS/400 side? We have auto config ON. When I connect both drives to the swicth (and set up the zones) I'm guessing I'll see the moved drive as a new resource and it should show up under the library? (Go Hardware, opt #3, Use the Work With resource option on the library). And, if you use the WRKMLBSTS command, do you see all six drives under the library? Thanks! Mike
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  • Lovemyi
    Yes, with Auto config turned on your will see in your case both drives TAP01 and TAP02 or what ever the resource name that get created for each actual tape device show up under TAPMLB01. It is really that simple. Lovemyi
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  • Lovemyi
    Work with Media Library Status System: Type options, press Enter. 1=Vary on 2=Vary off 3=Reset resource 4=Allocate resou 5=Allocate unprotected 6=Deallocate resource 8=Work with desc Device/ Opt Resource Status Allocation TAPLTO VARIED ON TAP11 OPERATIONAL UNPROTECTED TAP12 OPERATIONAL UNPROTECTED TAP13 OPERATIONAL UNPROTECTED TAP14 OPERATIONAL UNPROTECTED TAP15 OPERATIONAL UNPROTECTED TAP16 OPERATIONAL UNPROTECTED Lovemyi
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  • mcl
    OK, That is just what I expected to see. IBM tech support said today that I should have everything going through one SAN switch. We also have an issue with the second system (Power 6 8203-E4A) and the configuration of the FC adapter that IBM wants to change. Thanks again for all the help. I'll update this thread if we get it working! Regards Mike
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  • mcl
    We got it working. Forgetting for the moment resource names and device names - in the library, drive #1 is the bottom drive and drive #2 is the next drive up. Initially, drive #1 (bottom drive) showed up as a resource under the library device on both systems. To start with, we turned on control paths on both drives (a few weeks ago). We tried power cycling the Fiber Channel IOA that drive #1 was plugged into. That didn't do any good. What we finally did was vary off the library (TAPMLB01) on each system and then power cycled the Fiber Channel IOA that drive #2 was connected to. That created a second library resource and device and drive #2 showed up as a resource under that library. We then varied OFF the second library device and varied ON the first library device. Both drive resources then appeared under TAPMLB01. I ran a backup test on both systems and it works fine. We kicked around using only one SAN switch, but in the end we are still using two. The caveat here - System A is a 9406-570. System B is an 8203-E4A. System B does not have an IOP. IBM says that a 3583 tape library has to be connected to an IOA under an IOP. So, they don't officially support this configuration we are using. But, it does work. Thanks for all the suggestions! Regards Mike
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