vSphere Upgrade & Install

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  • 1.  SAN boot requirement

    Posted May 22, 2014 11:27 AM

    Hello Community members!!!

    This is my first discussion (question) here.

    Really appreciate for any help.

    I am planning to install around 10 ESXi hosts using SAN Boot (EMC storage).

    Honestly, I never deployed SAN boot before.

    Is there any best practices for SAN boot? Should I request only one LUN for all ESXi host OS? or should I request 10 LUNs for 10 ESXi hosts?

    What will be the recommended LUN size for ESXi host OS (one or 10 OS)

    Should I request a separate LUN for ESXi OS ?


    Thu Ya

  • 2.  RE: SAN boot requirement

    Broadcom Employee
    Posted May 22, 2014 11:59 AM

    Hi Friend,

      You need to first consider boot from SAN requirements:

    Plz refer:

    1.VMware vSphere 4 ESXi Installable and vCenter Server Documentation Center

    2. VMware vSphere 4 - ESX and vCenter Server


    The boot LUN must be dedicated to a single server. Hence you require dedicated LUN for each ESXi. (Total 10)

    Let me know if you have any other doubts.

  • 3.  RE: SAN boot requirement
    Best Answer

    Posted May 22, 2014 12:26 PM

    Hi Thu Ya,

    Do you use FC or iSCSI?

    You can read the vSphere Documentation about booting ESXi from FC SAN, iSCSI, or FCoE:

    vSphere 5.5 Documentation Center - Booting ESXi from Fibre Channel SAN

    vSphere 5.5 Documentation Center - Booting ESXi with Software FCoE

    vSphere 5.5 Documentation Center - Using ESXi with iSCSI SAN

    Make sure your HBAs/iSCSI NICs and arrays/storage support booting from SAN/iSCSI

    Yes you will need to request a separate LUN for your 10 ESXi hosts means 10 LUN (some vendor requires LUN ID 0).

    Be sure to exclusively mask the boot LUN to the host, boot-from-SAN boot LUNs must be exclusively masked to their host.

    The host can get the wrong identity from an incorrect LUN so you should configure single-initiator zoning in boot from SAN.

    The Emulex and QLogic BIOS can become unresponsive if several other initiators are in the same zone and you try to select a boot LUN.

    For the LUN requirements, you can prepare ~6GB LUN for each LUN as described in the vSphere 5.5 Documentation Center - ESXi Hardware Requirements

    Storage Requirements for ESXi 5.5 Installation

    Installing ESXi 5.5 requires a boot device that is a minimum of 1GB in size.

    When booting from a local disk or SAN/iSCSI LUN, a 5.2GB disk is required to allow for the creation of the VMFS volume and a 4GB scratch partition on the boot device.

    Some related KB as below:

    VMware KB: Preliminary Configuration for Boot-from-SAN

    VMware KB: Recommended disk or LUN sizes for VMware ESX 3.x / 4.x and ESXi 3.x / 4.x / 5.x installations

    VMware KB: Identifying ESXi/ESX boot LUNs for Boot From SAN configurations

    How to configure ESXi to boot via Software iSCSI? | VMware vSphere Blog - VMware Blogs

    Message was edited by: Bayu Wibowo

  • 4.  RE: SAN boot requirement

    Posted May 22, 2014 12:38 PM

    Hi Bayu,

    Really appreciate for your help.

    You are great!!


    Thu Ya