Richard Elling wrote:
On Sep 24, 2009, at 10:17 AM, Tim Cook wrote:
On Thu, Sep 24, 2009 at 12:10 PM, Richard Elling
<richard.ell...@gmail.com> wrote:
On Sep 24, 2009, at 12:20 AM, James Andrewartha wrote:
I'm surprised no-one else has posted about this - part of the Sun
Oracle Exadata v2 is the Sun Flash Accelerator F20 PCIe card, with 48
or 96 GB of SLC, a built-in SAS controller and a super-capacitor for
cache protection.
http://www.sun.com/storage/disk_systems/sss/f20/specs.xml
At the Exadata-2 announcement, Larry kept saying that it wasn't a
disk. But there
was little else of a technical nature said, though John did have one
to show.
RAC doesn't work with ZFS directly, so the details of the
configuration should prove
interesting.
-- richard
Exadata 2 is built on Linux from what I read, so I'm not entirely
sure how it would leverage ZFS, period. I hope I heard wrong or the
whole announcement feels like a bit of a joke to me.
It is not clear to me. They speak of "storage servers" which would be
needed to
implement the shared storage. These are described as Sun Fire X4275
loaded
with the FlashFire cards. I am not aware of a production-ready Linux
file system
which implements a hybrid storage pool. I could easily envision these
as being
OpenStorage appliances.
-- richard
Well, I'm not an expert on this at all, but what was said IIRC is that
it is using ASM with the whole lot running on OEL.
These aren't just plain storage servers either. The storage servers are
provided with enough details of the DB search being performed to do an
initial filtering of the data so the data returned to the DB servers for
them to work on is only typically 10% of the raw data they would
conventionally have to process (and that's before taking compression
into account).
I haven't seen anything which says exactly how the flash cache is used
(as in, is it ASM or the database which decides what goes in flash?).
ASM certainly has the smarts to do this level of tuning for conventional
disk layout, and just like ZFS, it puts hot data on the outer edge of a
disk and uses slower parts of disks for less performant data (things
like backups), so it certainly could decide what goes into flash.
--
Andrew
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