Re: [ADSM-L] Update stgp devclass (Was Re: [ADSM-L] partitioning 3583)

2007-04-25 12:27:27
Subject: Re: [ADSM-L] Update stgp devclass (Was Re: [ADSM-L] partitioning 3583)
From: "Prather, Wanda" <Wanda.Prather AT JHUAPL DOT EDU>
Date: Wed, 25 Apr 2007 12:26:46 -0400
I don't believe you can change the devclass of a stgpool.
(after all, a stgpool contains media, and that media has already been written - 
 the device type can't be metamorphosed on the fly.)
But, you can change the devclass to point to a different library.
Sorry I should have been more specific about the devclasses in my original 
I didn't realize that your LTO1 and LTO3 cartridges are currently in the same 
What if you update your 3583 devclass to point to LIBA, and check JUST the old 
LTO3 tapes into LIBA.
Then do MOVE DATA's to get the data into the new stgpool, send the original 
volumes back to SCRATCH status.
Then point the 3583 devclass back to LIB b, where the LTO1's are.
Will that straighten it out?


From: ADSM: Dist Stor Manager on behalf of Ray
Sent: Tue 4/24/2007 11:56 AM
Subject: Update stgp devclass (Was Re: [ADSM-L] partitioning 3583)


Thanks for the info, i appreciate it.  I did see in the operator guide that
the configurations are fixed, but i can deal with that.

I partitioned the library and put the two LTO-3 drives in Lib A.  The four
LTO-1 drives in Lib B.  The old device class was '3583'.  I created a new
devclass called '3583L3'.  Then created new libraries and checked LTO3
cartridges into Lib A, LTO1's into Lib B.  Now here's my problem:

I have a storage pool and LTO-3 volumes that are still device class '3583'.
But they're now in the Lib A LTO3 library.  Is there a way to change the
devclass on the storage pool or the volumes to '3583L3'??  Whenever the
storage pool needs one of the L3 volumes, it does a mount request thinking
the volume needs to be checked into Lib B (and of course the LTO-1 drives in
Lib B can't read the LTO-3 cartridge).

Of course i could wait for most of the data to naturally expire, but i think
there may be some long retention on some of the data.   Thanks for any


On 4/23/07, Prather, Wanda <Wanda.Prather AT jhuapl DOT edu> wrote:
> Been there done that, all though it was quite a while ago.
> You are correct that
> - There is nothing in TSM code that will prevent TSM from trying to mount
> an LTO3 cartridge in an LTO1 drive, if they are defined to the same TSM
> library.  If you dig around in the books and web site you can find that
> documented, but I agree it isn't intuitively obvious.
> - The partitioning of the 3583 is limited to the  FIXED configurations
> described in the 3583 Setup & Operator Guide topic "multipath library
> configurations".  One place in the book sorta implies some flexibility, but
> I checked with our regional tape specialist, and the configurations shown in
> the book are the only ones available.  (There are also restrictions on how
> the slots are divided up per logical library - if you have the 12-slot I/O
> door, the 6 slots below the door ALWAYS go with lib A, for example.)
> -Looks to me like you are correct that you will have 2 LTO3 drives in lib
> A and the other 4 LTO1 drives in lib B, which means you will have to move
> things around.
> -In addition to creating the partitions, you must assign a CONTROL PATH to
> the new logical library.  (Every logical library must have at least 1 drive
> assigned as the control path.)  See in the book "add control paths".  Then
> when you run cfgmgr, you should see a new /dev/smcx device.
> -Everything else you have looks right.  Partition the library, reboot it,
> run config mgr.  Make sure the devices show up in AIX like you expect.
> Then for TSM you just create a new library, drives,  & paths in TSM on the
> new /dev/smcx device, check the tapes in to that library.  Update the
> paths/drives in the old library defined on /dev/smc0.  TSM thinks it's 2
> real, physically separate libraries.
> Things to check on:
> --Early releases of the 3583 didn't have the "multipath" feature, which
> means you can't partition.  If you don't find the right virtual buttons on
> your front panel, you probably need to upgrade the microcode, although I'm
> pretty sure you have to be reasonably current since you are running
> LTO3's.  (I'd recommend getting up to date on the microcode, anyway.)
> -Make sure you are using a reasonably up-to-date version of the Setup &
> Operator guide.
> Once you get past the frustration of having to use the fixed partitions
> you get, it works like a champ.
> W
> ________________________________
> From: ADSM: Dist Stor Manager on behalf of Ray
> Sent: Mon 4/23/2007 3:18 PM
> Subject: partitioning 3583
> All,
> Through a little confusion and lack of research, we have a 3583 library
> where we have mixed LTO1 and LTO3 media.  Apparently we read that TSM and
> the 3583 supports "mixed-media with LTO" and didn't read the fine print,
> thinking it would just work.  The drives and cartridges are in a single
> device class (format=drive) all in the same storage pool.  Surprisingly
> this
> has been working fine for a few months.  I have 4 LTO-1 drives in slots
> 1-4,
> and 2 LTO-3 drives in slots 5-6.
> After a backup failure, i noticed TSM trying to mount an LTO3 cartridge in
> an LTO1 drive.  Further research showed that our setup should not work at
> all haha.  I've determined the best course of action now is to partition
> into 2 logical libraries.  One library for LTO-1 media, one for LTO-3
> media.  Having never done this before, i have a few questions.
> 1.  Are the 3583 partitioning configurations "fixed"?  I don't see a way
> to
> assign a particular drive to a particular partition.  If it is a fixed
> config, then according to the operator guide, when you define 2 logical
> libaries, drive slots 1 and 2 are in library A, and slots 3-6 are in
> library
> B.  If this is true, i'll have to physically move the LTO-3 drives to
> slots
> 1 and 2.   Am i following this correctly?
> 2.  Library is connected to a p5-570 running AIX 5.3.  Right now the
> library
> is /dev/smc0.  After partitioning, will i get a smc0 and an smc1?  Should
> i
> run cfgmgr after partitioning?
> 3.  What is the best procedure to do the partition?  I'm thinking i need
> to
> checkout all the cartridges, then turn off the library.  Move the tape
> drives, then partition the library.  Then deal with the AIX devices
> changing
> (rmdev/cfgmgr).  Then redefine drives/paths, define new device classes and
> checkin the cartridges to the right logical library.  Am i missing
> anything?
> We're running TSM  Thanks for any info.  I appreciate it.
> ray
> --
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> Ray DeJean                              
> <>  <
> Systems Engineer                    Southeastern Louisiana University
> IBM Certified Specialist              AIX Administration, AIX Support
> =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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