Primary Storage and IBM Spectrum Virtualize

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Storwize Disk Calculation

  • 1.  Storwize Disk Calculation

    Posted Thu May 11, 2017 12:39 PM

    Hello. I am looking for some help to make calculations for volume and LUN read/write latency. I use SMIS to grab statistics but unsure how to translate stats or convert to calculate latency.

  • 2.  RE: Storwize Disk Calculation

    Posted Thu May 11, 2017 12:55 PM

    Also another question that I have. Maybe someone can help me with? Will Storwize use SSD disk as a storage cache?

  • 3.  RE: Storwize Disk Calculation

    Posted Thu May 18, 2017 10:31 AM


    When SSD storage is present in a Storwize array it can be used in two ways:

    1. As a dedicated storage tier where you are able to use the SSD capacity to provision volumes to your host systems. In a system with SSD and traditional disk, you will end up with two storage pools, one for each tier.
    2. To create an EasyTier configuration. This is when you have a storage pool made up of traditional disks but then add some of your SSD capacity to the pool. Storwize will then migrate hot blocks of data to the SSD storage to improve the performance of the whole storage pool. With this option you do not specify which tier within the pool to create the volume on, you just create the volume in the pool and some SSD storage will be used based on the performance characteristics of data blocks.

    Hope this makes sense


    Darren Sanders

    Principal Consultant

    Celerity Ltd

  • 4.  RE: Storwize Disk Calculation

    Posted Fri May 19, 2017 01:36 PM

    Hello Darren this makes very good sense to me. Thank you for taking the time to respond.