Thank you all for the valuable input!
what is the problem with direct I/O? You should never run an Oracledatabase through page cache anyway :)
Most places with growing databases and heavy duty environments on vmware
use ASM. Some use XFS or similar and LVM, though I am not fond of those.
On Tue, Oct 30, 2018 at 4:34 PM Leng <lkaing@xxxxxxxxx> wrote:
Asm is great when you plan correctly. If you don’t it’s very painful. Eg.
If you have different sized disks asm will be forever rebalancing, and
failing as there is not enough space on the odd disk. So you need to vacate
the diskgroup to rebuild it. (Yes, you know... not my fault, the previous
consultant did it...) If there’s an asm bug you may have to take an outage
on the Asm to apply the patch.
Normal disk operations like dd to asm is almost impossible. Trying to
find that corrupted data block on the asm disk takes great asm expertise
from a great oracle support engineer.
Those were some up of my worst asm nightmares. It was only 2 years ago. I
have since moved on...
Cheers,
Leng
On 31 Oct 2018, at 7:20 am, Stefan Koehler <contact@xxxxxxxx> wrote:database through page cache anyway :)
Hello Dimitre,
what is the problem with direct I/O? You should never run an Oracle
usually not passed through correctly with VMDKs on VMFS, etc.) if it is
I would go with tweaked XFS (e.g. "nobarrier" as this information is
just one single instance in this VM.
um 19:12 geschrieben:
Best Regards
Stefan Koehler
Independent Oracle performance consultant and researcher
Website: http://www.soocs.de
Twitter: @OracleSK
"Radoulov, Dimitre" <cichomitiko@xxxxxxxxx> hat am 30. Oktober 2018
synchronous, right?
Thank you Chris, Matthew and Niall,
so the question is if performancewise ASM is worth it.
With the default Oracle database settings the I/O on XFS would be
enable async I/O without turning on direct I/O too.
And if I understand correctly Note 1987437.1, on Linux you cannot
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Regards
Dimitre
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