Stupid & Funny from Around the World :Continued

[Bratva]

What is a LUN, and why do we need one?

A LUN (Logical Unit Number) is a unique identifier given to separate devices, or logical units, so they can be accessed by a SCSI, iSCSI or Fibre Channel protocol. LUNs are key to disk array configuration because disks are typically defined in sets of RAID groups to protect against failure; however, those RAID groups can't be presented to the host. By assigning LUNs, all or a portion of a RAID group's capacity can be presented to the host as individual, mountable volumes.

For IT pros, implementing LUN storage involves a number of decisions, such as the number of LUNs to be created, what size they will be and what hardware the LUNs will live on. Additionally, techniques such as LUN masking and LUN zoning can be used to dictate which hosts have access to which LUNs.

http://searchstorage.techtarget.com/answer/What-is-a-LUN-and-why-do-we-need-one

 

[friendly_troll96]

What is a LUN, and why do we need one?

A LUN (Logical Unit Number) is a unique identifier given to separate devices, or logical units, so they can be accessed by a SCSI, iSCSI or Fibre Channel protocol. LUNs are key to disk array configuration because disks are typically defined in sets of RAID groups to protect against failure; however, those RAID groups can't be presented to the host. By assigning LUNs, all or a portion of a RAID group's capacity can be presented to the host as individual, mountable volumes.

For IT pros, implementing LUN storage involves a number of decisions, such as the number of LUNs to be created, what size they will be and what hardware the LUNs will live on. Additionally, techniques such as LUN masking and LUN zoning can be used to dictate which hosts have access to which LUNs.

http://searchstorage.techtarget.com/answer/What-is-a-LUN-and-why-do-we-need-one

what's lun masking?

 

[Bratva]

what's lun masking?

Logical Unit Number Masking or LUN masking is an authorization process that makes a Logical Unit Number available to some hosts and unavailable to other hosts. LUN Masking is a level of security that makes a LUN available to only selected hosts and unavailable to all others.

In the Example below we have taken a small subset of servers that are accessing one storage device. The SAN is presenting four LUNs to the server on the right side (with the red arrows) but it is only presenting two LUNs to the server on the left (with the green arrows).

 

[friendly_troll96]

Logical Unit Number Masking or LUN masking is an authorization process that makes a Logical Unit Number available to some hosts and unavailable to other hosts. LUN Masking is a level of security that makes a LUN available to only selected hosts and unavailable to all others.

In the Example below we have taken a small subset of servers that are accessing one storage device. The SAN is presenting four LUNs to the server on the right side (with the red arrows) but it is only presenting two LUNs to the server on the left (with the green arrows).

Okay. Can you get rid of your lun?

 

[Bratva]

Okay. Can you get rid of your lun?

Of-course

Detaching Devices and Removing a LUN

Before you can remove a LUN, you must detach the corresponding device by using the vSphere Client or the esxcli storage core device set command. Detaching a device brings a device offline. Detaching a device does not impact path states. If the LUN is still visible, the path state is not set to dead.

https://pubs.vmware.com/vsphere-50/...cli.examples.doc_50/cli_manage_files.5.6.html

 

[friendly_troll96]

Of-course

Detaching Devices and Removing a LUN

Before you can remove a LUN, you must detach the corresponding device by using the vSphere Client or the esxcli storage core device set command. Detaching a device brings a device offline. Detaching a device does not impact path states. If the LUN is still visible, the path state is not set to dead.

https://pubs.vmware.com/vsphere-50/index.jsp?topic=/com.vmware.vcli.examples.doc_50/cli_manage_files.5.6.html

Thank you. That was so helpful.
Can you get another lun when you already have one? Where will the additional lun go?

 

[HRK]

View attachment 438908

Well it is indeed a disgraceful act ..... why the Biryani was ignored its not atheist

 

[MastanKhan]

Thank you. That was so helpful.
Can you get another lun when you already have one? Where will the additional lun go?

Hi,

Seems like you are enjoying this conversation---.

 

[friendly_troll96]

Hi,

Seems like you are enjoying this conversation---.

Not exactly the convo, but the mental image of mods' face when they'll try to find excuse to delete my replies.

 

[Thorough Pro]

I love this guy, one of my favourites now that Louis CK is accused of sexual harassment

 

[Bratva]

Thank you. That was so helpful.
Can you get another lun when you already have one? Where will the additional lun go?

refer to this

Logical Unit Number Masking or LUN masking is an authorization process that makes a Logical Unit Number available to some hosts and unavailable to other hosts. LUN Masking is a level of security that makes a LUN available to only selected hosts and unavailable to all others.

In the Example below we have taken a small subset of servers that are accessing one storage device. The SAN is presenting four LUNs to the server on the right side (with the red arrows) but it is only presenting two LUNs to the server on the left (with the green arrows).

 

[friendly_troll96]

refer to this

available to only selected hosts and unavailable to all others.

that's not fair.
Can a host get to choose the lun they want?

 

[Bratva]

that's not fair.
Can a host get to choose the lun they want?

Nope. Need permission to access sensitive places.

 

[friendly_troll96]

Nope. Need permission to access sensitive places.

 

[Soumitra]