RanjnaAggarwal
VMware Employee
VMware Employee

Canonical Name in Storage device Naming Convention

Who Assigns the Canonical Name in Storage device Naming Convention? Storage Vendor or ESXi?

Regards, Ranjna Aggarwal
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3 Replies
Gkeerthy
Expert
Expert

generally the storage naming convention called as Canonical Name, but there are differnt types and who assigns that name depend upon the ARRAY

if the array is not InterNational Committee for Information Technology Standards (T10).then for those arrays it is not mandatoy that... it will give a unique id in the form which ESX understands..

the different ways the esx labels the LUN is

ESX 3.X

  • vmhba<Adapter>:<Target>:<LUN> or vmhba<Adapter>:<Target>:<LUN>:<Partition>
  • vml.<VML> or vml.<VML>:<Partition>
  • /dev/sd<Device Letter> or /dev/sd<Device Letter><Partition>
  • <UUID>

There are 6 different ways ESX use to label storage.

ESX 4.X

  • naa.<NAA> or  naa.<NAA>:<Partition>
  • eui.<EUI> or eui.<EUI>:<Partition>
  • mpx.vmhba<Adapter>:C<Channel>:T<Target>:L<LUN> ormpx.vmhba<Adapter>:C<Channel>:T<Target>:L<LUN>:<Partition>
  • vml.<VML> or vml.<VML>:<Partition>
  • vmhba<Adapter>:C<Channel>:T<Target>:L<LUN>
  • /dev/sd<Device Letter> or /dev/sd<Device Letter><Partition> (ESX only, not for ESXi)
  • <UUID>

ESXi 5.x

- naa.<NAA>:<Partition> or eui.<EUI>:<Partition>

- mpx.vmhba<Adapter>:C<Channel>:T<Target>:L<LUN> or mpx.vmhba<Adapter>:C<Channel>:T<Target>:L<LUN>:<Partition>

- vml.<VML> or vml.<VML>:<Partition>
- vmhba<Adapter>:C<Channel>:T<Target>:L<LUN>

- <UUID>




NAA  stands for Network Addressing Authority identifier. EUI stands for  Extended Unique Identifier. The number is guaranteed to be unique to  that LUN. The NAA or EUI identifier is the preferred method of  identifying LUNs and the number is generated by the storage  device. Since the NAA or EUI is unique to the LUN, if the LUN is  presented the same way across all ESX hosts, the NAA or EUI identifier  remains the same.

So normally the Array give the NAA id and esx just puts in he canonical name... and if the array didnt  gave then esx will generate and puts in the canonical name...

i hope this  clears the query

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admin
Immortal
Immortal

Here is a quick comparison:

StorageDeviceNaming1.png

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virtualkingraj
Contributor
Contributor

The naming convention involved in esxi HBA and storage box communication is called canonical name.

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