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Thread: Hardware sizing for iSCSI Storage

  1. #1
    Join Date
    Aug 2011
    Location
    Germany
    Posts
    22

    Default Hardware sizing for iSCSI Storage

    Hello,

    I know that there are certified hardware partners but I like to discuss hardware sizing generally to get some other points of view:


    ### Disks
    If I plan an DSS7 Active/Passive iSCSI cluster with 8TB or 16TB diskspace, how many disks and what HW-Raid level do you suggest?
    8TB: 3 Disks? 4 Disks? RAID5?
    16TB: 5 Disks? 6 Disks? ...

    ### Disk Technology
    Is there a big (real world) performance difference between SAS and SATA disk?

    ### Controller
    In the past I used mostly LSI Controllers. Any suggestion here?
    Write Cache with BBU yes/no?

    ### Network
    I use MPIO for iSCSI with 2-4 1GBit Ethernet. The next storage I plan to setup with 2x 10Gbit MPIO with an Intel NIC. Ok?

    ### CPU
    Single CPU with 2-4 Cores? How much does Open-E benefit from multicore?

    ### Memory
    If I check the memory usage, Open-E does not use a lot... 8GB memory still enough or better 16 or even more?



    Happy discussing... :-)

    Best regards, Manuel
    There are only 10 types of people in the world:
    Those who understand binary, and those who don't

  2. #2

    Default

    I will help start this and leave some room for others to add input.

    ### Disks
    If I plan an DSS7 Active/Passive iSCSI cluster with 8TB or 16TB diskspace, how many disks and what HW-Raid level do you suggest?
    8TB: 3 Disks? 4 Disks? RAID5?
    16TB: 5 Disks? 6 Disks? ...
    -------------------------
    Min. of 8 disks as this is best for best IOPS.
    -------------------------

    ### Disk Technology
    Is there a big (real world) performance difference between SAS and SATA disk?
    -----------------
    Yes there is especially with 10K and 15K SAS drives.
    -----------------

    ### Controller
    In the past I used mostly LSI Controllers. Any suggestion here?
    Write Cache with BBU yes/no?
    ----------------------------
    Yes unless you have a really good UPS.
    ----------------------------
    ### Network
    I use MPIO for iSCSI with 2-4 1GBit Ethernet. The next storage I plan to setup with 2x 10Gbit MPIO with an Intel NIC. Ok?
    ------------------------------
    All good, bonds are for NAS and MPIO for SANs.
    ------------------------------
    ### CPU
    Single CPU with 2-4 Cores? How much does Open-E benefit from multicore?
    -------------------------------
    Quad core or more is good.
    -------------------------------
    ### Memory
    If I check the memory usage, Open-E does not use a lot... 8GB memory still enough or better 16 or even more?
    ---------------------
    8GB is enough for 16TB
    ---------------------
    All the best,

    Todd Maxwell


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  3. #3

    Default

    If would help to know for what the storage will be used for. What kind of loads do you expect?

    Any Raid/Storage solution setup depends highly on the purpose for which is it intended.

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