Friday, November 19, 2010

H.A. Slot Calculation in 4x

How to calculate h.a. slots in a cluster:

Start with the number of esx/esxi hosts. In this example, there are 3 esxi hosts.
You can see that in the "Total hosts in cluster" line. The next line shows you all three hosts are currently running.

Now look at the number of virtual machines running. In this case the number is 6. This is easy to see and notice that you see that value twice (Used slots and Total powered on vms in cluster).

Look at the size of the memory and cpu reservations of all of the machines and document the highest one. If no reservations are present, the defaults are 256mhzs and 0mbs of ram. This has been changed in 5x (nowadays 32mhz and 0mb plus overhead). In this case, notice the 345MB.

Now if you have 3 hosts, each would have 78. The idea here is one of them would go down. That would leave us with 156 (78 x 2). If you subtract 6 (the running vms), that leaves you 150.

Thursday, November 18, 2010

How to increase the memory allocated to the service console

Increasing the memory allocated to the service console in ESX 4X from 300mb to 800mb requires editing of two files. The files are esx.conf in the /etc/vmware directory and grub.conf in the /boot/grub directory. 800mb is the maximum allowed. The swap partition should be changed as well from 600mb (twice the ram allocated to the service console by default) to 1600mb maximum.

# vi /etc/vmware/esx.conf

# vi /boot/grub/grub.conf

Just a few VMware ESX commands

The power of the command line interface

ESX 4X Commands to make life easier:

Dealing with physical nics:
esxcfg-nics -l                                                                                                              
List available network cards
esxcfg-nics -s 100 -d full vmnic2                                                                           
Set card to full duplex, 100mbits
esxcfg-nics -a vmnic2                                                                                              
Set card to autonegociate

Dealing with virtual switches:
esxcfg-vswitch -l                                                                                                          
list all available virtual switches
esxcfg-vswitch -a vSwitch1                                                                                       
create a new virtual switch
esxcfg-vswitch -A "My VMs" vSwitch1                                                                  
add a port group to a vswitch
esxcfg-vswitch -L vmnic1 vSwitch1                                                                         
associate a nic to a switch
esxcfg-vswitch -U vmnic1 vSwitch1                                                                         
remove a nic from a switch
esxcfg-vswitch -d vSwitch1                                                                                         
remove a virtual switch

Dealing with routing:
esxcfg-route -l                                                                                                                
list the routing table
set the gateway
esxcfg-route -a default                                                              
add a gateway

Dealing with the nfs server:
esxcfg-nas -l                                                                                                                    
list nfs mounts
esxcfg-nas -a -o -s /test01 nfs01                                                                  
mount /test01 from an nfs server r/w and label the datastore nfs01
esxcfg-nas -a -o -s /test02 nfs02 -y
mount a second nfs share read only
 esxcfg-nas -d nfs01
unmount the nfs01 datastore
Dealing with the firewall:
esxcfg-firewall -q                                                                                                           
query the firewall
esxcfg-firewall -e ntpClient                                                                                          
enable ntp service
esxcfg-firewall -d ntpClient                                                                                          
disable ntp service
esxcfg-firewall -allowIncoming                                                                                   
open all incoming ports
esxcfg-firewall -blockIncoming                                                                                   
block all incoming ports
esxcfg-firewall -allowOutgoing                                                                                   
open all outgoing ports
esxcfg-firewall -blockOutgoing                                                                                   
block all outgoing ports

Dealing with storage:
find newly added storag/rescan hbas

Dealing with the service console:
esxcfg-vswif -i -n vswif0                                                  
set the ip address of the service console
esxcfg-vswif -a vswif0 -p “Service Console” -i -n       
add a service console

Dealing with vmkernel ports:
esxcfg-vmknic -a “VM Kernel” -i -n                            
add the vmkernel nic and give ip

Dealing with iSCSI:

esxcfg-swiscsi -q

query the software initiator
esxcfg-swiscsi -e
enable the software initiator
esxcfg-swiscsi -d 
disable the software initiator

Dealing with the esxcli command:
esxcli swiscsi nic add -n vmk0 -d vmhba35
bind the vmkernel port to a particular hba
esxcli swiscsi nic list -d vmhba35
list bindings
esxcli nmp psp list
list available multipathing options