![]() | Sun System Handbook - ISO 4.1 October 2012 Internal/Partner Edition | ||
|
|
![]() |
||||||||||||
Solution Type Problem Resolution Sure Solution 1010855.1 : Sun Storage 3310/3320/3510/3511 Arrays: Identifying and Resolving an Incorrect "Controller Unique Identifier"
PreviouslyPublishedAs 214991 Applies to:Sun Storage 3310 Array - Version Not Applicable and laterSun Storage 3320 SCSI Array - Version Not Applicable and later Sun Storage 3510 FC Array - Version Not Applicable and later Sun Storage 3511 SATA Array - Version Not Applicable and later All Platforms Symptoms{SYMPTOM} 1. Multiple arrays will exhibit the same Ethernet or MAC address. This document will explain why this problem happens, and includes steps to resolve it. Changes{CHANGE} The CUI is by default generated from the chassis serial number. On a working array, if this CUI is changed, both the MAC address as well as the worldwide names will change thereby causing problems at the host end. For smooth operation of the array, we must ensure that the CUI always remains the same after any maintenance activity. Cause{CAUSE} Explanation for the above two issues:1. Multiple arrays will exhibit the same Ethernet or MAC address. This problem may happen when we use the cloning feature of these type of arrays where we can duplicate the NVRAM settings from one array to another. We can save the NVRAM or the configuration details from one array and use this to create the same configuration on the other array. By doing this, we also duplicate the CUI and the MAC address. Hence we could have more than one array with the same MAC address. 2. The unique worldwide names may change resulting in change of DIDs (device ids) which are used for SunCluster configurations. All the controller FRUs that come from Logistics have their controller unique identifier field set to "0" . When a new controller is used as a replacement FRU, it inherits the "unique identifier" from the primary controller, in the case of a dual controller configuration, or the chassis serial number becomes the controller unique identifier, in the case of a single controller or scenarios where the primary controller is also having problems. The bottom line is that during a controller replacement or cloning, we must ensure that the CUI is set to the same value as the array chassis serial number. Failing to do so will result in either multiple arrays having the same Ethernet address, or the worldwide names of the logical drives will change. Solution
ResolutionIf one of these problems occurs, perform the following steps to resolve this issue :
NOTE 1: If the midplane is replaced, then the controller unique identifier will change and in this case, if we are running SunCluster, then we would have to manually recreate the DIDs for SunCluster to work normally. NOTE 2: A non-zero value should be specified only if the chassis has been replaced but the original CUI has to be retained: for example, in a SunCluster configuration to maintain the same DIDs. This practice is not recommended as it can lead to problems and confusion in the future. On the next available outage, the DIDs must be manually fixed for the Cluster to work normally.
Attachments This solution has no attachment |
||||||||||||
|