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  • 1.  VSAN disk drives needed for Host Instalation

    Posted Jun 26, 2014 04:02 AM

    Hi All,

    I have 2 questions about VSAN

    1) HP smart array controller is not needed as storage is handles by VSAN.

    2) The hardware chosen can only accommodate 5 disks, so if we use one disk to install ESXi5.5, can we use remaining disk to be used for VSAN somehow, or we have to live with 4 disk for VSAN in my case.



  • 2.  RE: VSAN disk drives needed for Host Instalation

    Broadcom Employee
    Posted Jun 26, 2014 05:29 AM

    Hi Friend,

    1. I am not sure 100% on first question.

    2. You mean you have 5 local disk attached to  ESXi host & one would be used to install ESXi itself. Yes, remaining 4 can be used for vSAN : Note that : A minimum of three ESXi 5.5 hosts, all contributing local disks (1 SSD and 1 HDD) are required for vSAN.

    Please refer end-end requirement details (ie. host/storage/network/license requirements) :::VMware KB: vSphere 5.5 Virtual SAN requirements

    For more details: virtual san

  • 3.  RE: VSAN disk drives needed for Host Instalation
    Best Answer

    Posted Jun 26, 2014 12:20 PM

    you will need to have a disk controller which supports passthrough at a minimum, and one from the VSAN HCL. Judging by the VSAN HCL you need a proper controller anyway,

  • 4.  RE: VSAN disk drives needed for Host Instalation

    Posted Jun 27, 2014 08:54 PM

    It happens VMware allowed (to my surprise) some RAID controllers which do NOT support direct passthrough (and with it all smart functionality).  So - if you have a supported RAID Controller and it can only expose the disks via multiple virtual RAID 0 LUNs - one RAID0 per disk - for example the DELL H710P is such a candidate - you are good to go. BUT you have to consult the HCL.

  • 5.  RE: VSAN disk drives needed for Host Instalation

    Posted Jun 28, 2014 02:24 PM

    1) Not sure which model of HP server you are looking at but here are a few notes of consideration:

    - From what I've seen the embedded P420i has a better queue depth than the H220 (both on the HCL) and the latest HP ready nodes use the 420i in both medium and high workload ready nodes. See the community queue depth sheet by William Lam here: https://docs.google.com/spreadsheets/d/1FHnGAHdQdCbmNJMyze-bmpTZ3cMjKrwLtda1Ry32bAQ/edit#gid=0

    - If you order the HP server you will be tempted to do so without the cache (since you don't need the controller cache as you would disable it anyway). Don't do this. If you have zero cache on the controller, you will be limited to creating 3 RAID0 disks. You need the cache on board and you disable it, this will enable you to provision all of your disks as RAID0 (the way you get around pass-thru with RAID controllers)

    - To expand your disk group by adding disks or to create a new disk group by adding disks online, you'll need to use the Array Configuration Utility command line from HP and configure groups remotely. If anyone else can verify if there is a GUI or another way to do it from the host, that would be great, but from what we've seen so far you need the ACU CLI to do this.

    2) You could boot to a SD card or SAN if you have one as alternatives to a local boot disk thus giving you all 5 disk slots. HP sells I believe 8GB and 32GB SDCards for this purpose and they are much cheaper than a hard disk. This is what most of my customers are doing anyway even without Virtual SAN.

  • 6.  RE: VSAN disk drives needed for Host Instalation

    Posted Jul 03, 2014 12:49 PM

    The HCL was just modified to finally respect only Controllers > 256 QD.

    Update on Virtual Hardware Compatibility Guide | VMware vSphere Blog - VMware Blogs

    Best regards,