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    FreeBSD 10 guest - CAM status: SCSI Status Error

    vmejo Lurker

      Hi,

       

      I'm running into a serious problem wrt. a FreeBSD guest under ESXi 5 (VMware vCenter Server V 5.5.0 Build 1623101 to be exact):

       

      From time to time for no apparent reason I get the following errors on the guest:

       

      Increasingly I'm seeing errors like these:

       

      Dec 15 01:33:25 igue kernel: (da0:mpt0:0:0:0): WRITE(10). CDB: 2a 00 00 c0 9e 22 00 00 08 00

      Dec 15 01:33:25 igue kernel: (da0:mpt0:0:0:0): CAM status: SCSI Status Error

      Dec 15 01:33:25 igue kernel: (da0:mpt0:0:0:0): SCSI status: Busy

      Dec 15 01:33:25 igue kernel: (da0:mpt0:0:0:0): Retrying command

      Dec 15 01:33:25 igue kernel: (da0:mpt0:0:0:0): WRITE(10). CDB: 2a 00 00 c0 00 a2 00 00 08 00

      Dec 15 01:33:25 igue kernel: (da0:mpt0:0:0:0): CAM status: SCSI Status Error

      Dec 15 01:33:25 igue kernel: (da0:mpt0:0:0:0): SCSI status: Busy

      Dec 15 01:33:25 igue kernel: (da0:mpt0:0:0:0): Retrying command

       

      BTW, the "disk" is recognized by the OS as follows:

       

      Dec 12 13:42:40 igue kernel: da0 at mpt0 bus 0 scbus2 target 0 lun 0

      Dec 12 13:42:40 igue kernel: da0: <VMware Virtual disk 1.0> Fixed Direct Access SCSI-2 device

      Dec 12 13:42:40 igue kernel: da0: 300.000MB/s transfers

      Dec 12 13:42:40 igue kernel: da0: Command Queueing enabled

      Dec 12 13:42:40 igue kernel: da0: 61440MB (125829120 512 byte sectors: 255H 63S/T 7832C)

       

       

       

      Here's what I checked so far:

       

      • Faulty disk, SCSI-errors is something that can be ruled out for sure: "Disks" used by this VM come from a NetApp system providing storage for 200+ virtual machines and none of them is experiencing these problems.
      • re-installing guest OS from scratch - errors remain
      • with or without VMware tools installed - errors remain
      • Set everything up under FreeBSD 9.x instead of FreeBSD 10 - same story
      • these errors are definitely not related to "heavy io" - the machine in question is acting as a DHCP and caching DNS-server
      • errors appear repeatedly but not related to a specific time of the day

       

      Even worse: if these errors appear several times in a row the VM completely crashes and has to be "power-cycled" manually

       

      Thanks much in advance for any clue,

      -vmejo

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