Dynamic capacity expansion over asynchronous remote volume mirroring results in failed drives and failed volumes

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Dynamic capacity expansion over asynchronous remote volume mirroring results in failed drives and failed volumes

Applies to

E-Series Controller Firmware 8.xx
SANtricity

E5500 running prior to 08.25.14.00 firmware.
• E5600 running prior to 08.25.14.00, or prior to 08.30.40.00 firmware, or 08.40.00.00 firmware.
• E5700 running 08.40.00.00 firmware.

Issue

When performing one of the following reconfigure operations on a volume group containing ARVM mirrors with PI enabled and a controller that supports multicore, the reconfigure operation can result in PI Reftag errors that lead to failed drives, failed volumes and failed reconfigure operations. Due to the volume failure during reconfiguration, the only way to recover is to delete the volume group. The data cannot be recovered by recreating the configuration.

Affected Reconfigure Operations:

Dynamic Capacity Expansion (DCE)
Dynamic Volume Expansion (DVE)
Dynamic Segment Sizing (DSS)
Dynamic RAID Migration (DRM)
Defrag

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The following conditions must exist:

The system is running one of the platforms and affected releases listed in the Environment section (Multiple Core platform's only)
Volume Groups contain ARVM mirrors with PI enabled
A DCE, DVE, DSS, DRM, or Defrag reconfigure operation occurs on a Volume Group with PI enabled and ARVM mirrors
Traditional Volumes (DDP is not affected)

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How to correct ACP partial connectivity and Single Path HA on a FAS22xx platform

Applies to

FAS2000 series

Description

This article describes the procedure that should be followed to correct Alternate Control Path (ACP) partial connectivity and Single Path HA on a FAS22xx platform.

The following output is displayed:

NetApp Release 8.1 7-Mode: Thu Mar 29 13:56:17 PDT 2012 System ID: 1789379212 (ncdra00016n1); partner ID: 1789383578 (ncdra00016n2) System Serial Number: 600000139685 (ncdra00016n1) System Rev: B1 System Storage Configuration: Single-Path HA System ACP Connectivity: Partial Connectivity

Note: Without any external disk shelves, the FAS22XX series controller has only one path to the disks on the internal shelf, and there is no connection to the ACP lock-wrench port e0P.

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Troubleshooting Workflow: cluster join failure

Applies to

Clustered Data ONTAP 8.2

Issue

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Cluster join failure

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How to troubleshoot MetroCluster check cluster errors

Applies to

MetroCluster
metrocluster check
Cluster errors

Description

MetroCluster check reports errors on the cluster object:

ClusterA::> metrocluster check show Last Checked On: mm/dd/yyyy hh:mm:ss Component Result ------------------- --------- nodes ok lifs ok config-replication ok aggregates ok clusters warning 5 entries were displayed.

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What is the recommended Fillword setting for using 8GBps Brocade switches?

Applies to

Brocade 8GBps Switches
Brocade 300
Brocade 5100

Question(s) and Answer(s)

What are Fillwords in a fibre channel environment and what does NetApp recommend they be set at?

What is the recommended Fillword setting for using 8GBps Brocade switches?

Fillwords are 4-byte words without a special task. A port sends them when it does not have to send something else. They are used to maintain the synchronization of the link.

The recommended Fillword setting is 3.

E ports and ISL ports may require different settings depending on xWDM vendors. Contact the vendors in both of these situations.

The available Fillword values are as follows:

0 | -idle-idle Sets IDLE mode in the Link Init and IDLE as the fill word (default).
1 | -arbff-arbff Sets ARB(ff) in the Link Init and ARB(ff) as the fill word.
2 | -idlef-arbff Sets IDLE mode in the Link Init and ARB(ff) as the fill word.
3 | -aa-then-ia Attempts hardware arbff-arbff (mode 1) first. If the attempt fails to go into active state, this command executes software idle-arb (mode 2). Mode 3 is the preferable to modes 1 and 2 as it captures more cases.

The difference is that '3' attempts '1' and then '2'.

Note :

Changing fillword is a disruptive event as the port will bounce when this change is made.
Some third-party storage vendors might require different Fillwords for their storage than
E ports and ISL ports may require different settings depending on xWDM vendors. Contact the vendors in both of these situations.

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How to identify a device by its World Wide Name (WWN) or MAC address?

Applies to

ONTAP

Description

The Organizationally Unique Identifier (OUI) is built into all MAC addresses and World Wide Node and Port names. The naming format used will determine which part of the name is the OUI.

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