vSphere 4

To adjust the queue depth for an HBA:

1. Verify which HBA module is currently loaded by entering one of the following commands on the service console:
   
   For QLogic:
   
   vmkload_mod -l | grep qla2xxx
   
   For Emulex:
   
   vmkload_mod -l | grep lpfcdd
    
2. Run one of the following commands. The examples show the QLogic qla2300_707 and Emulex lpfcdd_7xx modules. Use the appropriate module based on the outcome of the previous step.
   
   For QLogic:
   
   vicfg-module -s ql2xmaxqdepth=64 qla2300_707
   
   For Emulex:
   
   vicfg-module -s lpfc0_lun_queue_depth=16 lpfcdd_7xx
   
   In this case, the HBAs represented by ql2x and lpfc0 will have their LUN queue depths set to 64.
    
3. Reboot your host.

ESX 3.0/3.5

To set the queue depth for a QLogic HBA

1. Log in to the service console as root.
    
2. Verify which QLogic HBA module is currently loaded:
   
   vmkload_mod -l | grep qla2300
   
   Depending on the model of the HBA, the module can be one of the following:
   
   qla2300_707 (ESX 3.0.x)
   qla2300_707_vmw (ESX 3.5)
    
3. Run the following commands.
   
   esxcfg-module -s ql2xmaxqdepth=64 qla2300_707
   esxcfg-boot –b
   
   The HBA represented by ql2x will have its LUN queue depth set to 64.
   
   The example shows the qla2300_707 module. Use the appropriate module based on the outcome of Step 2.
    
4. Reboot.

To change the queue depth of an Emulex HBA

1. Log on to the service console as root.
    
2. Verify which Emulex HBA module is currently loaded:
   
   vmkload_mod -l | grep lpfcdd
   
   Depending on the model of the HBA, the module can be one of the following:
   
   lpfcdd_7xx
   lpfcdd_732
    
3. For a single instance of an Emulex HBA on the system, run the following commands. The example shows the lpfcdd_7xx module. Use the appropriate module based on the outcome of Step 2.
   
   esxcfg-module -s lpfc0_lun_queue_depth=16 lpfcdd_7xx
   esxcfg-boot –b
   
   In this case, the HBA represented by lpfc0 will have its LUN queue depth set to 16.
    
4. For multiple instances of an Emulex HBA being present on the system, run the following commands:
   
   esxcfg-module -s "lpfc0_lun_queue_depth=16 lpfc1_lun_queue_depth=16" lpfcdd_7xx
   esxcfg-boot –b
   
   In this case, both HBAs lpfc0 and lpfc1 will have their LUN queue depths set to 16.
    
5. Reboot.

ESX 2.x

1. Edit the file /etc/vmware/hwconfig and locate the line for the QLogic adapter. It looks similar to this:

   device.3.12.0.name = "QLogic Corp QLA2312/2340 (rev 02)"

   Take note of the string of three numbers between device and name.
    
2. Continuing in /etc/vmware/hwconfig, add one of the following lines to the end of the file:
    
   1. For ESX Server 2.0, add this line:
      
      device.vmnix.3.12.0.options = "ql2xmaxqdepth=nn"
       
   2. For ESX Server 2.1 and later versions, add this line:
      
      device.esx.3.12.0.options = "ql2xmaxqdepth=nn"
      
      In the example, 3.12.0 is the string of numbers taken from the QLogic line located in the previous step, and nn is the desired queue depth maximum. Be sure to save your changes.
      
      Note: The second character in ql2xmaxqdepth is a lowercase "L".
       
3. Reboot the server.