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lun mapping and masking

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Hi,

Please I like to check a thing in which I am confused.

During the creation of a LUN,i saw that there is also necessary to assign an hostid to this LUN,Is this lun mapping?What is the hostid?Is somehow the wwpn of an hba this hostid?

Other way is like below:

Then also I saw that there is necessary to map the lun to a certain port in Clariion(wwpn),who is connected to the server who need to see the new lun.This is lun mapping.right?

then on the server we could perform lun masking if we like to see only a part of the total luns mapped to a certain port in controller of Clariion.

tnx a lot,

marius

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4 Tellurium

Re: lun mapping and masking

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If you are referring to HLU (Host Lun ID) , it is the identity assigned to the LUN (which will be represented from array side by ALU - Array Lun ID) for host identification. Host will not be aware of the ALU of the LUN assigned to it and it will be using HLU.

HLU/ALU numbers

Mapping the LUN to a specific port and masking is done with Symmetrix systems. With Clariion Systems, we have to create a storage group and then add the LUNs and registered hosts to the same. This is the LUN masking in Clariion/VNX.

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4 Tellurium

Re: lun mapping and masking

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If you are referring to HLU (Host Lun ID) , it is the identity assigned to the LUN (which will be represented from array side by ALU - Array Lun ID) for host identification. Host will not be aware of the ALU of the LUN assigned to it and it will be using HLU.

HLU/ALU numbers

Mapping the LUN to a specific port and masking is done with Symmetrix systems. With Clariion Systems, we have to create a storage group and then add the LUNs and registered hosts to the same. This is the LUN masking in Clariion/VNX.

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2 Bronze

Re: lun mapping and masking

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Hi Vipin,

When we register a host,it means that we assing the wwpn(port name) of HBA as initiator to the storage?

tnx a lot,

marius

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Re: lun mapping and masking

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By definition, registration is the process of making the host known to the storage. By registering a host, you will be assigning the hostname and IP address to the host connections/HBAs.

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Re: lun mapping and masking

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Hi Vipin,

Please clarify with me things.I seen somewhere that also to register host,we could register HBA of that host in Clariion.Right?So wwpn of each port within HBA?

Is this other way to register a host which is different of registering ip and hostname(of a certain host) in storage?

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Re: lun mapping and masking

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Once the host is connected via multiple paths with storage (same HBA port via different storage ports/ multiple HBA ports etc...), it will display multiple entries in the connectivity status (even though it is from same HBA/host ). You have to register the paths,  ( HBAs- as you mentioned in the comment above). This is the process of host registration.

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Re: lun mapping and masking

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Hi Vipin,

In order to register a host(wwpn of HBA) with a storage,there is necessary to register HBAs, IP and host name?

tnx a lot,

marius

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Re: lun mapping and masking

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While registering paths (HBA / host) you have to give the Host name, IP address, failover mode, initiator type etc...

Hope How to manually register a host HBA with a CLARiiON array using Navisphere Manager and CLI 6.4?will help you in understanding the same.

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Re: lun mapping and masking

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There are a number of documents available on the support.emc.com that will explain the basic requirements for connecting a host to an array. One way to register a host is by using the EMC Server Initialization Tool (EMC Server Utility), or by installing the EMC Host Agent. These two programs are shipped with each array and you install them on your host. They will then aid in registering a host that is connected to an array.

If the array is a Unified VNX, you can go to mydocs.emc.com and create a customer installation guide based on the host and the array (VNX) that you have.

glen

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Re: lun mapping and masking

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Hi Vipin,

Tnx a lot for everything.

Only a thing now.

If a  certain port of one of the SAN controller fails,than the LUN who is seen through this port to a host,could be mapped to other port in controller,so it will be available to host after zoning.right?

give me an example of how an faulty port or an whole controller faulty is seen in storage log.

tnx a lot,

marius

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