TLU & VLT Masking

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Be sure you have a well documented and thought out configuration so as to prevent mistakenly presenting the wrong tape drive to the wrong host over the wrong port as this can create performance and reliability problems.

TLU[edit]

For both Quantum i2000/6000's and i500's, you have to configure the I/O blades to recognize the servers that drives are to be presented to. The Masking must be setup to allow access for the servers to use the tape drives.

WARNING: Before attempting to do any masking, you should have a good understanding of SAN technologies as they relate to tape drives, and have a well thought out plan on what hosts need to see what drives threw which I/O blades and HBA ports. Be careful that you don't end up with having two devices show up on a single host for the same tape drive as this can cause problems with that tape drive.

  1. Log into the Tape libraries Management Console: i2000 is a Java interface, and i500 is a web-page
  2. For i2000 look under Setup -> Devices -> Access -> FC Host
    For i500's look under Setup -> I/O Blades -> Host Management
  3. Select the Host you wish to configure. It will generally show up as unknown, but you can identify it by the WWN of the HBA.
  4. On Both i2000 and i500 click the Modify button, and you will be able to enter a hostname and define what type of system this host is.
    You are also given the ability to designate which port this particular WWN is coming from, to help with identifying multiple ports on the same server.
    For i500 you select the host and click on the Next button.
  5. The i500 will put you back out to the main screen, were you'll now have to select Setup -> I/O Blades -> Host Mapping
    The i2000 will take you back to the FC Host screen were you can now click on LUN Mapping.
  6. LUN/Host Mapping is essentially where you designate which drives will be presented threw which I/O blade on which LUN for the specific host's port that you selected to do the mapping for.

After making changes to the LUN mapping/masking, you'll want to save the new configuration.

For both the i2000 and i500 you can find this is under Tools -> Save/Restore

The pop-up from the i2000 allows you to either Save to a file (which will also update the backup copy of the configuration on the library it's self), or just Save Rescue to save the new configuration to the backup copy.
You'll now want to close the ticket that the configuration mis-match created.

The i500 lets you pick between two options, Save or Restore, which either save or restore a backup copy of the configuration.

VTL[edit]

For this example we will use a DXi7500, but the concepts are similar for other DXi systems though the actual configuration options can be very different.

Keep in mind that best practice is to only allow a single virtual tape drive to be presented to a single server over a single path. Using SSO or other advanced features with a virtual drive is not recommended.

  1. Log-in to the DXi's web-console.
  2. Click on Configuration on the left had menu
  3. Select the VTL tab, and then the Host Access tab under it.
  4. Under Host Access select the Hosts tab.
    You may have to click on the Refresh Hosts tab to see any newly zoned severs.
  5. Enter an Alias for the WWN related to the server in question and click on Apply.
    Put the server name and other information information into the alias field so that it can easily be identified.
  6. Under Host Access click on Add to create a new group for this newly added sever.
  7. Select the correct Partition, Host and Target for the new server.
  8. Enter a Group Name the follows the naming standard of PARTITION_SERVER_TARGET.
  9. Select the appropriate virtual drives (and robotic control only if needed) to present to the new server.
    Make sure that the LUN numbers start at the number 0 and increment upwards, otherwise the server may have difficulty recognizing the LUN's.
  10. Double check your configuration, then click on Apply



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