NEX-8460 make sd_io_time a per-disk tunable and set it appropriately for virtual disks
Reviewed by: Dan Fields <dan.fields@nexenta.com>
Reviewed by: Roman Strashkin <roman.strashkin@nexenta.com>
NEX-14507 slow-io detector should be disabled for virtual disks
Reviewed by: Dan Fields <dan.fields@nexenta.com>
Reviewed by: Cynthia Eastham <cynthia.eastham@nexenta.com>
Reviewed by: Rick McNeal <rick.mcneal@nexenta.com>
OS-14 sd attach should not issue potentially slow scsi commands (ddi-forceattach=1)

*** 19,28 ****
--- 19,29 ----
  # CDDL HEADER END
  #
  
  #
  # Copyright (c) 1991, 2010, Oracle and/or its affiliates. All rights reserved.
+ # Copyright 2017 Nexenta Systems, Inc.
  #
  
  name="sd" class="scsi" target=0 lun=0;
  name="sd" class="scsi" target=1 lun=0;
  name="sd" class="scsi" target=2 lun=0;
*** 48,52 ****
--- 49,63 ----
  
  #
  # Associate the driver with devid resolution.
  #
  ddi-devid-registrant=1;
+ 
+ #
+ # Force attach to avoid timing problems with deferred attach
+ # and tools like format(1M).
+ #
+ ddi-forceattach=1;
+ 
+ sd-config-list=
+         # Set appropriate timeout and disable slow-io detector
+         "VMware  Virtual disk", "io-time:180,slow-io-threshold:0";