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gen8 + esxi + m1015 IT passthrough + freebsd + zfs, then I/O error


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My hardware and system:
  gen8 + E3-1230 v2 + 8G ECC x 2 + 4T WD HDD x 4 
  840EVO 120G ssd     store vmware freebsd 10.1 virtual machine
  32G TF card             host esxi 5.1 u1 system
  IBM ServeRAID M1015 HBA in IT mode      passthrough to freebsd 
The operation with zpool and test:
  zpool create -f nas raidz1 /dev/da1 /dev/da2 /dev/da3 /dev/da4
  zfs create nas/share
  time dd if=/dev/zero of=/nas/share/data bs=8k count=1000000
Then I got the following I/O error:
After that I run freebsd on gen8 directly without esxi, and do the same test, everything goes well.
It seems that esxi + HBA passthrough doesn't work well, but I don't know why.
I really need to run esxi to create vm for different OS, how should I fix this I/O error, any suggestion?


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