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VMFS + ISCSI + DRBD = Concurrent local write detected!

  • 1.  VMFS + ISCSI + DRBD = Concurrent local write detected!

    Posted Sep 21, 2010 06:24 PM

    Hi there,

    I've been trying a setup with 2x ESXI sharing LUN from 1x IETD backed by DRBD(primary/secondary) setup, and I keep getting the warning from DRBD

    http://119368.533969 block drbd1: istiod1[5646] Concurrent local write detected! [DISCARD L] new: 186824832s +512; pending: 186824832s +512

    http://119372.621872 block drbd1: istiod1[5645] Concurrent local write detected! [DISCARD L] new: 186824832s +512; pending: 186824832s +512

    http://119783.013975 block drbd1: istiod1[5642] Concurrent local write detected! [DISCARD L] new: 186824832s +512; pending: 186824832s +512

    http://120221.605624 block drbd1: istiod1[5645] Concurrent local write detected! [DISCARD L] new: 186824832s +512; pending: 186824832s +512

    A deep discussion happening on iscsitarget-devel@lists.sourceforge.net involves both IETD & DRBD maintainers suggest this is not a iscsi issue or a DRBD issue, only thing I can think of is the VMFS is actually trying to submit conflicting commands? And interestingly, no matter what vm operation I do, what kind of VM I run, I always getting the same alert (same sector, same size, everything).

    So, anyone can explain this?