Asset ID:	1-71-1008482.1
Update Date:	2010-07-22
Keywords:

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Solution Type  Technical Instruction Sure

Solution  1008482.1 :   L180 - Impact of Drive Address Resequencing in Sun StorageTek L700/L180 with Veritas NetBackup  


PreviouslyPublishedAs
211595

Description
Impact of Drive Address Resequencing in Sun StorageTek L700/L180 with Veritas NetBackup
When the L700/L180 Library is powered on and an attached drive fails to initialize and does not communicate with the Library Controller the sequential addressing of the attached drives will change.

Steps to Follow
Impact of Drive Address Resequencing in Sun StorageTek L700/L180 with Veritas NetBackup
When the L700/L180 Library is powered on and an attached drive fails to initialize and does not communicate with the Library Controller the sequential addressing of the attached drives will change.
Example: Original drive 0, did not initialize properly and lost communication with the Library Controller; the original drive 1 will now became drive 0 and the remaining drives addresses will increment by one.

The Dynamic WWN assignments will not be impacted and does not get overridden by the resequencing of the drive addresses. Recommend customers bind the port on the switch to drive's Dynamic WWN.
Binding the switch port to the Dynamic WWN provides more flexibility in the host addressing options and greatly reduces host configuration impact of drive initialization errors and configuration changes in the advent of replacing a failed drive.

If the customer's configuration does not have a switch between the host and drive, and the drive addresses are resequenced it may be necessary to issue a "re-discover" command from NBU to re-address the drives.

There is also an "auto_path_correction" option in NBU but we have found inconsistent results when used with Solaris operating systems. This option seems to be more consistent when used with Linux and Window operating systems under NBU 7.0.

Product
Sun StorageTek L180 Tape Library
Sun StorageTek L700 Tape Library

Internal Comments
Oracle Review 1/28/10, Glen Foley

Sun StorageTek L180 Tape Library, L180, L700, CRCM Drive Address Resequencing Veritas NetBackup NBU
Previously Published As
90624

Change History
Date: 2007-09-26
User Name: 71396
Action: Approved
Comment: Performed final review of article.

Updated trademarking.

Publishing.
Version: 4
Date: 2007-09-20
User Name: 25646
Action: Approved
Comment: This document is part of the CRC Migration effort and does not require the standard technical review process.
Version: 0
Date: 2007-09-18
User Name: T210396
Action: Approved
Comment: resending to orest for tech review
Version: 0
Date: 2007-09-18
User Name: T210396
Action: Rejected
Comment: returning to draft stage
Version: 0
Date: 2007-09-18
User Name: T210396
Action: Accept
Comment:
Version: 0
Date: 2007-09-18
User Name: T210396
Action: Approved
Comment: sending to orest for tech review
Version: 0
Date: 2007-09-18
User Name: T210396
Action: Add Comment
Comment: This document is part of the CRC Migration effort and does not need the standard technical review.
Version: 0
Date: 2007-09-18
User Name: T210396
Action: Created
Comment:
Version: 0

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