HP (Hewlett-Packard) QR516B Manuale Utente
VMware ESX Release 3.5 Update 4 through ESX 4.x and ESXi 5.0
As of VMware ESX release 3.5 update 4, and including ESX 4.0 GA and ESX 4.1 (with all ESX
4.x updates) , and ESXi 5.0 (with all updates), an algorithm has been added that allows ESX to
respond to Queue Full and Busy SCSI messages from the storage array. The Queue Full or Busy
response by ESX is to back off of I/O for a period of time, thus helping to prevent overdriving of
the HP 3PAR StoreServ Storage ports. This feature should be enabled as part of an ESX - HP 3PAR
StoreServ Storage deployment.
4.x updates) , and ESXi 5.0 (with all updates), an algorithm has been added that allows ESX to
respond to Queue Full and Busy SCSI messages from the storage array. The Queue Full or Busy
response by ESX is to back off of I/O for a period of time, thus helping to prevent overdriving of
the HP 3PAR StoreServ Storage ports. This feature should be enabled as part of an ESX - HP 3PAR
StoreServ Storage deployment.
The Queue Full and Busy LUN-throttling algorithm is disabled by default. To enable the algorithm,
complete the following steps:
complete the following steps:
1.
From the VI/vSphere client, select the ESX host. In the Configuration tab, select Advanced
Settings for software, and then select Disk.
Settings for software, and then select Disk.
2.
Scroll to find and adjust the following HP-recommended settings:
QFullSampleSize = 32
QFullThreshold = 4
With the algorithm enabled, no additional I/O throttling scheme on ESX 3.5 update 4 and newer
ESX release is necessary. Consult the additional information regarding the ESX Queue Full/Busy
response algorithm found in KB 1008113, which is available on the VMware Knowledge Base
website:
ESX release is necessary. Consult the additional information regarding the ESX Queue Full/Busy
response algorithm found in KB 1008113, which is available on the VMware Knowledge Base
website:
VMware ESXi Release 5.1
The Advanced Settings parameters QFullSampleSize and QFullSampleSize are required to enable
the adaptive queue-depth algorithm.
the adaptive queue-depth algorithm.
In ESXi releases earlier than ESXi 5.1, these parameters are set globally; that is, they are set on
all devices seen by the ESXi host. In VMware ESXi 5.1, however, these parameters are set in a
more granular fashion, on a per-device basis.
all devices seen by the ESXi host. In VMware ESXi 5.1, however, these parameters are set in a
more granular fashion, on a per-device basis.
VMware patch ESXi510-201212001, dated 12/20/2012 (KB 2035775), restores the ability to
set the values of these parameters globally. The patch is available on the VMware Knowledge
Base website:
set the values of these parameters globally. The patch is available on the VMware Knowledge
Base website:
To set the parameters globally, install the patch and follow the instructions in
.
You can also use the esxcli command to set these values on a per-device basis. If both options
(the esxcli and the advanced parameters) are used, the per-device values take precedence.
(the esxcli and the advanced parameters) are used, the per-device values take precedence.
To set QFullSampleSize and QFullThreshold on a per-device level, issue the following
esxcli
esxcli
command:
# esxcli storage core device set --device device_name -q Q -s S
The settings do not require a reboot to take effect and are persistent across reboots.
You can retrieve the values for a device by using the corresponding list command:
# esxcli storage core device list
The command supports an optional --device parameter:
#
esxcli storage core device list --device device_name
48
Configuring the Host for a Fibre Channel Connection