How to enable Exadata writeback Flashcache on cell storage ? (WriteThrough to WriteBack)

Steps to enabling the Flashcache mode:

This can be done in rolling as well as non-rolloing manner.

First check flashcache mode with below command on all cell servers with the use of dcli utility on DB node. It can be check on cell each server also with cellcli utility.

dbnode1#dcli -l root -g cellgroup "cellcli -e list cell detail" | grep "flashCacheMode"

10.156.110.10: flashCacheMode:          WriteThrough
10.156.110.11: flashCacheMode:          WriteThrough
10.156.110.12: flashCacheMode:          WriteThrough
10.156.110.13: flashCacheMode:          WriteThrough
10.156.110.14: flashCacheMode:          WriteThrough
10.156.110.15: flashCacheMode:          WriteThrough
10.156.110.16: flashCacheMode:          WriteThrough

Step-1
Also we can find flashcache mode in each cell by executing below command:

cellcli>list cell detail

flashCacheMode: WriteThrough     --->Currently flashCacheMode configured as WriteThrough

Step-2
Now drop flashcache on each cell server: (If you are following rolling manner then do one by one on each cell server)

cellcli> drop flashcache

Step-3
Be sure asmdeactivationoutcome is YES before disabling grid disk

CellCLI> list griddisk attributes name,asmmodestatus,asmdeactivationoutcome

Step-4

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• What is cell disk ?
• What is grid disk ?
• What is IORM ?
• What are the ways to migrate on Exadata ?
• Procedure to drop cell disk on Exadata.
• What is cellsrv and how it works ?
• Use of cellsrv service on Exadata storage cell.
• What is iDB protocol ?
• What is the purpose to use Exacheck tool ?
• What is the oswatcher and how it works ?
• What is RS services and how it works ?
• How to enable HCC on database table ?
• How many networks are available on Exadata ?
• How we can integrate OEM12c with Exadata ?
• What are the ways to install OEM12c agent on Exadata ?
• Which cell services are running on Exadata storage cell ?
• Purpose of MS(management service) on storage cell.
• How cell storage software backup happens ?
• Which OS supports by Exadata ?
• How to power off Exadata Machine ?
• How to do maintainance on Cell Storage and DB server?
• What is writet-through caching mode ?
• What is Write-back caching mode ?
• Explain the procedure to drop the Cell storage ?
• How to replace physical storage disk on cell storage ?

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