Re: [Exadata] How do you use FlashDisk ?

  • From: Frits Hoogland <frits.hoogland@xxxxxxxxx>
  • To: kerry.osborne@xxxxxxxxxxx
  • Date: Sat, 19 Mar 2011 10:45:40 +0100

I have the same opinion as kerry (use all as flashcache). Flash makes OLTP 
perform (or: mimic the SAN cache of a regular setup). And flash is rather 
limited in size, so if you configure flash as a diskgroup,  you have to put in 
extra work to choose the objects to put in the flash diskgroup, and even more 
important: administer those, because most database objects change over time. 

Frits Hoogland
mailto: frits.hoogland@xxxxxxxxx
cell: +31-6-53569942

On Mar 19, 2011, at 10:19 AM, Kerry Osborne wrote:

> Hi Surachart,
> The biggest concern for me would be taking space away that could be used as 
> Flash Cache, which is critical for OLTP type work loads. Keep in mind that 
> you'll be duplicating blocks 2x or 3x depending on redundancy setting of the 
> grid disk (normal or high). My going in position would be to use all of the 
> space as Flash Cache. I would only consider creating a grid disk for very 
> high write objects and only if I could demonstrate a real improvement via 
> testing.
> Kerry Osborne
> Enkitec
> blog:
> On Mar 19, 2011, at 3:34 AM, Surachart Opun wrote:
>> On Exadata, You will have flashdisks. Idea to use them:
>> A. Make them for Exadata Smart Flashcache
>> B. Use them for Grid Disk for ASM Disk Group, and store some database files.
>> C. Use both A and B in Database System 
>> I just curious, What should I concern, if use Flash Disks to be Grid Disks.
>> What is you idea to use Flashdisk? However, Database System supports both 
>> OLTP and DSS.
>> Thank You
>> Surachart Opun
>> Oracle ACE, Contributor (Oracle User Group in Thailand)
>> skye: surachart_op

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