Connect SAN to ESX host

first create the lun on the san with the needed settings (disksize, raid model and lun id).
Add the lun and the vmware host in the same zone. (This make sure only esx machines have access to the lun to avoid possible problems)
In ESX host to a rescan disks. The new lun will show up and you can format it.
From now the lun is accesseble for storing vm's or other data.

Thanks hanccocka, much appreciated. Can you also list for iSCSI SAN as well. Many thanks

upto 5 steps I am fine, however you did not describe about LUN creating and how we will then connect ESX host to data store etc..

8. Assign WWNN (HBA A and HBA B) to Volume A (LUN 1)
9. Rescan Storage Adaptors on ESX
10. Add Storage and Create VMFS datastore and label.

Fibre Channel COnfiguration Guide for VMware vSphere 4.1
http://www.vmware.com/pdf/vsphere4/r41/vsp_41_san_cfg.pdf

iSCSI Configuration Guide
http://www.vmware.com/pdf/vsphere4/r41/vsp_41_iscsi_san_cfg.pdf

There's more configuration on ESXi to complete with iSCSI, these articles I've written on IE, walk you through the steps with screenshots.

Did not know, EE also has VMware Articles? Checkout my EE Articles

HOW TO: Enable Jumbo Frames on a VMware vSphere Hypervisor (ESXi 5.0) host server using the VMware vSphere Client

HOW TO: Add an iSCSI Software Adaptor and Create an iSCSI Multipath Network in VMware vSphere Hypervisor ESXi 4.1

HOW TO: Add an iSCSI Software Adaptor and Create an iSCSI Multipath Network in VMware vSphere Hypervisor ESXi 5.0

Highlevel for iSCSI

1. Create iSCSI Networks as above in EE Articles.
2. Add IP Address of SAN
3. Add iSCSI Initiator Name to SAN LUNs on SAN and Map LUN IDs.
4.. Rescan Storage Adaptors on ESX
5.. Add Storage and Create VMFS datastore and label

4 & 5 are the same for both FC and iSCSI

I do not know what SAN you have, all SANs are different, when creating and presenting LUNs. This is high level, not a how to!

1. Create a LUN or Volume on a SAN.
2. Map LUN or Volume to HBA WWNN.

After you have presented and Mapped a HBA to LUN on the SAN.

Re-scan of Storage Adaptors on the ESX Server, the LUN will appear.

you then select Add Storage and Follow the Wizard.

All described in detail in the PDFs above.

>(zone switches)

Should be step 5a after connecting cables, zoning at your step 2 requires typing the WWN manually rather than picking from a list.