Why are you not fond of XFS and/or LVM? What would be the great
advantage of ASM? You have 2 GB RAM too much? I am trying to avoid ASM
whenever I can. And so is Oracle. New ODA and Exadata boxes come with
Oracle data files on ACFS file system. Personally, I think that ASM is a
pain in the neck or lower and shouldn't be used unless the database is RAC.
Regards
On 10/30/18 5:38 PM, Andrew Kerber wrote:
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 <mailto: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
<mailto:contact@xxxxxxxx>> wrote:
>
> Hello Dimitre,
> what is the problem with direct I/O? You should never run an
Oracle database through page cache anyway :)
>
> I would go with tweaked XFS (e.g. "nobarrier" as this
information is usually not passed through correctly with VMDKs on
VMFS, etc.) if it is just one single instance in this VM.
>
> Best Regards
> Stefan Koehler
>
> Independent Oracle performance consultant and researcher
> Website: http://www.soocs.de
> Twitter: @OracleSK
>
>> "Radoulov, Dimitre" <cichomitiko@xxxxxxxxx
<mailto:cichomitiko@xxxxxxxxx>> hat am 30. Oktober 2018 um 19:12
geschrieben:
>>
>> 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 synchronous, right?
>>
>> And if I understand correctly Note 1987437.1, on Linux you
cannot enable async I/O without turning on direct I/O too.
>>
>> Regards
>> Dimitre
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--
Andrew W. Kerber
'If at first you dont succeed, dont take up skydiving.'
