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Thread: SES Planing: keeping ISCSI gates on OSD nodes - is wise?

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  1. #1

    SES Planing: keeping ISCSI gates on OSD nodes - is wise?

    Thinking about how to deploy SES for block-oriented applications "in smart way", I made a conclusion the iSCSI gateways should be deployed at the same servers with OSD nodes.

    - The "locality" of the iSCSI gate and corresponding image container might increase the productivity by removing LAN infrastructure from "local" data path.
    - If the cluster is not tweaked, the possibility of local data hit is 1 / OSD_Number. Thus, the smaller the cluster, the greater the gain.
    - If the CRUSH map will be tweaked to store more container data locally to their iSCSI gates, the gain will be increased.
    - The iSCSI multipathing might increase the performance as well.
    - If the CPU will be saturated, the classic Hi-End approach "one role per node" still might be used.

    - The amount of administrative work is increased.
    - Will SUSE still support such non-standard configuration? For example, 3 nodes for monitors and 10 nodes for OSD+iSCSI...

    Am I right?

  2. #2

    Re: SES Planing: keeping ISCSI gates on OSD nodes - is wise?


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  3. #3

    Re: SES Planing: keeping ISCSI gates on OSD nodes - is wise?

    Still seems the idea is good. Here is the example of lrbd configuration file, which allows to serve single iSCSI target with 4-way multipathing to 4 OSD nodes.
      "auth": [
        { "target": "", "authentication": "none" }
      "targets": [
          "target": "",
          "hosts": [
              { "host": "osd01", "portal": "portal01" }, 
              { "host": "osd02", "portal": "portal02" }, 
              { "host": "osd03", "portal": "portal03" }, 
              { "host": "osd04", "portal": "portal04" } 
      "portals": [
             { "name": "portal01", "addresses": [ "" ] },
             { "name": "portal02", "addresses": [ "" ] }, 
             { "name": "portal03", "addresses": [ "" ] }, 
             { "name": "portal04", "addresses": [ "" ] }
      "pools": [
          "pool": "iscsi01",
          "gateways": [ 
              "target": "",
              "tpg": [ { "image": "iscsivol01" } ]


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