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GROUP COLLOCATION

Discussion in 'Capacity Planning' started by David_FA, Sep 20, 2006.

  1. David_FA

    David_FA New Member

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    Hi!



    We are tryng to implement COLLOCATION BY GROUP.



    What would happend with the nodes that aren?t in a COLLOCATION group if we have stablished COLLOCATION BY GROUP in the Secuential Storage Pool?



    Would TSM server consider those nodes as another collocation group?





    Thanks in advance.
     
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  3. chad_small

    chad_small Moderator

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    I am wondering the same thing and plan on calling support to find out! I assume that only the nodes in the storage pool that are in the group would be collocated together but those in other storage pools that are in the collocation group would be collocated with those nodes in the same storage pool as they are.
     
  4. hogmaster

    hogmaster Senior Member

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    The nodes not in a collocation group will go to separate media. Acting like Collocation by node.

    This is quite usefull if you have some very large nodes. Mind you it will afeect your reclamamtion

    if you have too many nodes not in a collocation group.



    /regards Daniel Larsson :cool:
     
  5. Drewidian

    Drewidian New Member

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    I am new to TSM and while we have not used collocation here, I definitely want to set it up. I just have a couple of questions regarding turning it on.

    1) I only have 100 client nodes. If I turn on Collocation for 4 clients in a group and leave all of the other nodes out of the group, Will TSM setup all of the other clients as Collocation Nodes with a single tape being allocated to each client?

    2) Once the nodes are in a collocation group, can I have the nodes in a different domain or use a different schedule?

    Thanks in Advance.


     
  6. iltoda

    iltoda New Member

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    h def stg states:

    "If you specify COLLOCATE=GROUP but do not define any collocation
    groups or if you specify COLLOCATE=GROUP but do not add nodes to a
    collocation group, data is collocated by node. Be sure to consider
    tape usage when organizing client nodes into collocation groups.
    For example, if a tape-based storage pool consists of data from
    grouped and ungrouped nodes and you specify COLLOCATE=GROUP, the
    server does the following:
    + Collocates by group the data for grouped nodes only. Whenever
    possible, the server collocates data belonging to a group of
    nodes on a single tape or on as few tapes as possible. Data
    for a single node can also be spread across several tapes
    associated with a group.
    + Collocates by node the data for ungrouped nodes. Whenever
    possible, the server stores the data for a single node on a
    single tape. All available tapes that already have data for
    the node are used before available space on any other tape is
    used."

    I have never tested it.

    Marco
     
  7. ttrinh7975

    ttrinh7975 Senior Member

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    If I remember correctly, COLLOCATE=GROUP is available in v5.3+
     
  8. jideck

    jideck New Member

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    Occupation:
    Unix worker
    Location:
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    process of collocation

    1 change to collocation by group
    2 make some new groups at list 2 (1 group=collocation by node)
    --DEFINE COLLOCGROUP gr1
    --DEFINE COLLOCGROUP gr2
    3 assign nodes to groups
    --DEFINE COLLOCMEMBER gr1 node1,node2,node3,node4
    --DEFINE COLLOCMEMBER gr2 node5,node6,node7,node8
    4 Check how bad it is for one of nodes (defragmenatation through media)
    --select distinct node_name,volume_name,stgpool_name -
    from volumeusage where node_name='node1'

    all new backup will use new collocation order but old backup are unchenged to clean up make a new stg and use "move node data"
     

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