#65 ESXi RDM HDDs: unsupportable block size 0

nas4free under ESXi cannot handle physical RDM (raw device mapped) hard drives, but can.
Trying to use such drive causes error as like "(da1:mpt0:0:1:0): unsupportable block size 0"


  • Northwoods

    Northwoods - 2013-03-06

    I'm guessing your actually meaning virtual RDM where you create a linking file object to a local hard drive vs a fiber channel connected disk which would be physical RDM.

    I saw the same issue under the Paravirtual controller. It does work for me under the SAS controller.

  • Rrr

    Rrr - 2013-03-07

    I'm guessing this bug definitely caused by FreeBSD SCSI/CAM subsystem behavior, it handles RDMs pretty good in earlier nas4free builds.

    Last edit: Rrr 2013-03-07
  • thomas

    thomas - 2013-03-20

    First I thought there is a problem with the RDM in ESXi using a 3TB drive.

    But now I can confirm this bug with NAS4Free and

  • Mistar Muffin

    Mistar Muffin - 2013-06-01

    I was giving a spin and ran into this same bug. I'm using 2TB drives with RDM in ESXi 4.1.

  • zoon01

    zoon01 - 2015-05-11
    • Status: open --> closed

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