Enabling New Flash Cache Compression on Exadata Cells

The flash cards F40 and F80 support flash cache compression and uncompressed tables for example can reach a 4 times compression ratio.

To enable compression follow these steps:

1-Flush all the flash cache in cell

 CellCLI> alter flashcache all flush

2-Drop the flashcache

CellCLI> drop flashcache all

3-Drop all flash log

  CellCLI> dorp flashlog all

4-Drop all cell flash cache disks

  CellCLI> drop celldisk all flashdisk

5-On Cell that you want to enable flash cache compression run:

CellCLI> alter cell flashCacheCompress = TRUE

6-Create cell disk with flash disks

  CellCLI> create celldisk all flashdisk

7-Create flash log

  CellCLI> create flashlog all

8-Finally create flashcache

  CellCLI> create flashcache all

Best Regards,
Paulo Portugal

ps: for X3 run
CellCLI> alter cell flashCacheCompX3Support = TRUE