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Asset ID: 1-79-1996332.1
Update Date:2018-01-08
Keywords:
Solution Type  Predictive Self-Healing Sure

Solution  1996332.1 :   Oracle ZFS Storage Appliance: Actions to Perform for DEGRADED Drive Status  

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Describes action that should be performed for a DEGRADED drive

In this Document
Purpose
Scope
Details

Applies to:

Sun ZFS Storage 7320 - Version All Versions and later
Sun ZFS Storage 7420 - Version All Versions and later
Sun ZFS Storage 7120 - Version All Versions and later
Oracle ZFS Storage ZS3-4 - Version All Versions and later
Oracle ZFS Storage ZS3-2 - Version All Versions and later
7000 Appliance OS (Fishworks)

Purpose

This document is intended to provide the right actions to perform in case of DEGRADED status on a drive

Scope

Several actions can be considered while a DEGRADED status is observed on a drive. 

Details

A DEGRADED status on a drive is purely an indication to the user that 'something is wrong'. The vdev continues to operate as normal as far as I/O is concerned. 

FMA will activate a spare for this drive if one is available.

 

On systems running 2013.1.x firmware, a DEGRADED drive should simply be physically replaced.

 

Drive status should not be cleared with the CLI/BUI markrepaired function without investigation.

 

The CLI allows the administrator to do this:

s7120-ftlauder-a:> maintenance problems select problem-000 markrepaired
Marking a problem repaired indicates that an administrator has fixed the underlying
problem and restored any affected components to their normal state. This is typically
only performed by Oracle service personnel or a documented Oracle repair procedure.

Are you sure you want to mark this problem repaired?

Are you sure? (Y/N) Y
Problem "75d0c5d4-a8d8-4b82-ee6d-adf1f457cad5" has been marked repaired.

 

If the user uses "markrepaired", and if the reopen of the device succeeds, the drive may come up with an ONLINE status, though the reason why it was degraded has disappeared, and some counters of errors reached are reset. 

Therefore, all sorts of bad behaviour may occur for this drive, potentially causing bad consequences on the ZFS pool, for instance - slowness or data corruption.

Marking errors repaired should not be done without investigation.

 

If there is some belief that the drive is not really DEGRADED, and should not have been marked that way, the customer must involve Oracle Support and have a Support Representative analyze the situation of this drive.

The Support representative will request a support bundle and after analysis may provide a bug number and explanation why the drive was marked as DEGRADED and then ask for the problem to be marked "repaired" as shown above.

In other cases, the errors generated by FMA on the appliance should not be marked repaired.

 


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