Wednesday, 10 February 2016

Running dd on ESX

Ever tried to run dd on ESX and failed?
Did you see this error ?

 dd if=/dev/zero of=/vmfs/devices/disks/mpx.vmhba1:C0:T3:L0 bs=512 count=10
dd: can't open '/vmfs/devices/disks/mpx.vmhba1:C0:T3:L0': Function not implemented


Include "conv=notrunc" in your dd command and that should work for you.

dd if=/dev/zero of=/vmfs/devices/disks/mpx.vmhba1:C0:T3:L0 bs=512 count=10 conv=notrunc
10+0 records in
10+0 records out

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4 comments:

  1. anon7 December 2016 at 23:12

    Thank you! The stupid "dd can't open ... Function not implemented" message made it appear that that device could not be opened for writing. Thank you!

    ReplyDelete
  2. Anonymous9 December 2021 at 17:19

    5 years later. Still valid for ESXi 7.x series :) Thank You. Dumped internal SD card to external FCoE boot LUN before update.

    ReplyDelete
  3. Anonymous26 November 2022 at 14:48

    It's really worked, thank you!!! setupid vmware

    ReplyDelete
  4. Anonymous12 June 2024 at 13:11

    8 years later, 6.7, "invalid argument 'notrunc' to 'conv'"

    ReplyDelete

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