Flash / Data protection

From: George Leonard - Business Connexion <George.Leonard_at_bcx.co.za>
Date: Fri, 2 May 2014 05:47:20 +0000
Message-ID: <1D4E75C3-4212-4EAE-9C32-3A1F1CE05603_at_bcx.co.za>

It's friday, It's my curious day...

Sure this is written some where.

For Flash (F80 cards now) on Exadata storage servers connect to Exadata or SSC.

Can someone confirm,

For writes to a segment to write goes out to 2 or 3 storage servers (depending on the DG protection). All 2 or 3 accept the write (and acknowledges the write upstream as soon as the 1st has confirmed success), and then pushes ASYNC it down to the physical disk.

Reads: only one copy of data is read, from disk, and buffered in the closest/in same storage server Flash or is all copies of the blocks read in the 2 or 3 storage servers and the blocks are buffered in all 3 storage server flash cards?

Yours Sincerely

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George Leonard
Oracle Engineered System Specialist

Mobile: +27.82 655 2466
eMail: george.leonard_at_bcx.co.za<mailto:george.leonard_at_oracle.com> Web: http://www.bcx.com<mailto:george.leonard_at_oracle.com>

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Received on Fri May 02 2014 - 07:47:20 CEST