Hi Thomas,

for managing tape libraries in a dual data center you may take a look at
IRMM. IRMM can replace the TSM Library Manager, increasing the
high-availability of tape resources for TSM and other applications.

For instance, IRMM can integrate the tape drives and the tape cartridges of
multiple physical tape libraries and present them as single logical tape
library to TSM. If one tape library is down, then IRMM redirects new
scratch mounts to the resources of one of the remaining tape libraries.

IRMM's built-in priorities allow to automate the redirection of incoming
data. For instance, it is possible to direct the data of a certain TSM tape
storage pool to a tape library which is located in a data center A and only
to a tape library in a data center B if the preferred tape library is down.

IRMM's piorities enable to predefine such redirections in advance. No
configuration changes are required in TSM later on at the point in time,
when the tape library is going down. IRMM is designed to deal with hardware
outages thus it increases the robustness and the scalability of traditional
library sharing.

Please feel free to contact me directly via mail for further questions. I
am with IBM providing technical support for IRMM.

Best regards,
Ulf.


"ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU> wrote on 08.04.2009
06:01:40:
> ------------------------------
>
> Date:    Tue, 7 Apr 2009 14:41:24 -0400
> From:    Thomas Denier <Thomas.Denier AT JEFFERSONHOSPITAL DOT ORG>
> Subject: Active log for library manager
>
> I am in the process of planning a TSM configuration for dual
> data centers. I expect to have one instance of the TSM server
> code at each data center dedicated to the library manager
> function for the automatic tape library at that site. Based
> on reports from other sites that have set up library managers,
> I expect a database size of about 200 megabytes for each
> library manager. I expect to be using TSM Version 6. The
> documentation indicates that the minimum size for the
> active log is 2 gigabytes. This size will double if I mirror
> the active log, as I would prefer. Is there any way to
> avoid the absurdity of an active log 20 times as big as the
> database it supports?
>
> ------------------------------

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