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All disk drives have been placed in WriteThrough caching mode. RAID log shows "NVCache device failed, cannot support data retention" (Doc ID 2780629.1)

Last updated on JUNE 04, 2021

Applies to:

Exadata X5-2 Hardware - Version All Versions to All Versions [Release All Releases]
Exadata X4-8 Hardware - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

CellCLI> list alerthistory

critical "All disk drives have been placed in WriteThrough caching mode. Disk write performance may be reduced. The flash drives are not affected. Battery Serial Number : 31217 Battery Type : cvpm02 Battery Temperature : 36 C Pack Energy : 237 Joule Ambient Temperature : 29 C"

Supercap status is optimal:

BBU/Supercap check

------------------------
BatteryType: CVPM02
Battery State: Optimal

Cache policy is WT (WriteThrough):

opt/MegaRAID/storcli/storcli64 /c0/vall show
Controller = 0
Status = Success
Description = None

Virtual Drives :
==============

-------------------------------------------------------------
DG/VD TYPE State Access Consist Cache Cac sCC Size Name
-------------------------------------------------------------
0/0 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
1/1 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
2/2 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
3/3 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
11/4 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
4/5 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
5/6 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
6/7 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
7/8 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
10/9 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
8/10 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
9/11 RAID0 Optl RW Yes NRWTD - ON 7.151 TB

 

Attempted was made to change policy to WB (WriteBack):

/opt/MegaRAID/storcli/storcli64 /c0/vall set wrcache=WB
Controller = 0
Status = Success
Description = None

Detailed Status :
===============

---------------------------------------
VD Property Value Status ErrMsg ErrCd
---------------------------------------
0 wrCache WB Success - 0
1 wrCache WB Success - 0
2 wrCache WB Success - 0
3 wrCache WB Success - 0
4 wrCache WB Success - 0
5 wrCache WB Success - 0
6 wrCache WB Success - 0
7 wrCache WB Success - 0

 

However, it still remains as WT (WriteThrough):

/opt/MegaRAID/storcli/storcli64 /c0/vall show
Controller = 0
Status = Success
Description = None

Virtual Drives :
==============

-------------------------------------------------------------
DG/VD TYPE State Access Consist Cache Cac sCC Size Name
-------------------------------------------------------------
0/0 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
1/1 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
2/2 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
3/3 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
11/4 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
4/5 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
5/6 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
6/7 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
7/8 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
10/9 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
8/10 RAID0 Optl RW Yes NRWTD - ON 7.151 TB
9/11 RAID0 Optl RW Yes NRWTD - ON 7.151 TB

Changes

 None

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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