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Q1: 
Someone often use the term ESXi Patch 1 (or Patch 2). 
I suppose he meant Update 1 (or Update 2), right? 
 
Q2: 
Is Build 623860 an Update 1 or Update 2 and is this 
build referring to ESXi or to vCenter ? 
 
Q3: 
Any impact if I update from 1 to 2: any downtime to 
ESXi host (or I can vMotion VMs in it to another host) 
or downtime to vCenter only? 
 
Q4: 
Pls provide links/steps to update from Update 1 to 2 
 
Q5: 
I've recently applied an FC HBA driver into a customer's 
ESXi 5.0 Update 2 (as EMC requested me to do it so that 
it's supported for their VMAX SAN). &nbsp;If I upgrade from 
this version to ESXi 5.1b, will the driver get overwritten? 
Also provide steps on how to upgrade from this version 
to ESXi 5.1b
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Q1:
Someone often use the term ESXi Patch 1 (or Patch 2).
I suppose he meant Update 1 (or Update 2), right?

Q2:
Is Build 623860 an Update 1 or Update 2 and is this
build referring to ESXi or to vCenter ?

Q3:
Any impact if I update from 1 to 2: any downtime to
ESXi host (or I can vMotion VMs in it to another host)
or downtime to vCenter only?

Q4:
Pls provide links/steps to update from Update 1 to 2

Q5:
I've recently applied an FC HBA driver into a customer's
ESXi 5.0 Update 2 (as EMC requested me to do it so that
it's supported for their VMAX SAN).  If I upgrade from
this version to ESXi 5.1b, will the driver get overwritten?
Also provide steps on how to upgrade from this version
to ESXi 5.1b

ESXi Build 623860 : is it Patch/Update 1 or 2 and how to upgrade it

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.

VMware

Virtualization is the act of creating a virtual (rather than actual) version of something, including (but not limited to) a virtual computer hardware platform, operating system (OS), storage device, or computer network resources. Virtualization is usually the creation of a system that executes separate from the underlying hardware resources, or the creation of an entire desktop for systems located elsewhere, similar to thin clients.

Virtualization

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media used to retain digital data. In addition to local storage devices like CD and DVD readers, hard drives and flash drives, solid state drives can hold enormous amounts of data in a very small device. Cloud services and other new forms of remote storage also add to the capacity of devices and their ability to access more data without building additional data storage into a device.