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DISK_ASYNCH_IO=TRUE, FILESYSTEMIO_OPTIONS=SETALL but v$iostat.file=ASYNC_OFF [message #684370]

Fri, 21 May 2021 13:50

burkinaone
Messages: 11
Registered: October 2020

Junior Member

Hello.
DB is Oracle 19.3 on RHEL 7.9
ASM

I have this:
DISK_ASYNCH_IO=TRUE
FILESYSTEMIO_OPTIONS=SETALL

But when I run this query, I get ASYNC_OFF for all the rows:
SELECT d.name,
i.asynch_io
FROM v$datafile d,
v$iostat_file i
WHERE d.file# = i.file_no
AND i.filetype_name = 'Data File';

Trying to find out why.
Thanks for your responses.

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Re: DISK_ASYNCH_IO=TRUE, FILESYSTEMIO_OPTIONS=SETALL but v$iostat.file=ASYNC_OFF [message #684377 is a reply to message #684370]

Sat, 22 May 2021 01:16

John Watson
Messages: 8976
Registered: January 2010
Location: Global Village

Senior Member

Those parameters are not relevant when using ASM.

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Re: DISK_ASYNCH_IO=TRUE, FILESYSTEMIO_OPTIONS=SETALL but v$iostat.file=ASYNC_OFF [message #684380 is a reply to message #684377]

Sat, 22 May 2021 20:35

burkinaone
Messages: 11
Registered: October 2020

Junior Member

My questions are:
1. Does having ASYNC_OFF when running this query mean IOs are nor async for these file?

2. What should I change at ASM level or DB level to have ASYNC_ON for these parameters?

Thanks for your replies.

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Re: DISK_ASYNCH_IO=TRUE, FILESYSTEMIO_OPTIONS=SETALL but v$iostat.file=ASYNC_OFF [message #684384 is a reply to message #684380]

Sun, 23 May 2021 06:55

EdStevens
Messages: 1376
Registered: September 2013

Senior Member

burkinaone wrote on Sat, 22 May 2021 20:35

My questions are:
1. Does having ASYNC_OFF when running this query mean IOs are nor async for these file?

2. What should I change at ASM level or DB level to have ASYNC_ON for these parameters?

Thanks for your replies.

What part of "not relevant when using ASM." are you having difficulty with?

ASM Inherently Performs Asynchronous I/O Regardless of filesystemio_options Parameter (Doc ID 751463.1)

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Re: DISK_ASYNCH_IO=TRUE, FILESYSTEMIO_OPTIONS=SETALL but v$iostat.file=ASYNC_OFF [message #684389 is a reply to message #684384]

Sun, 23 May 2021 12:39

burkinaone
Messages: 11
Registered: October 2020

Junior Member

I have 2 databases on ASM with the same parameters (DISK_ASYNCH_IO=TRUE, FILESYSTEMIO_OPTIONS=SETALL).
One has ASYNC_ON, the other has ASYNC_OFF. I am trying to understand what makes this difference.
If you are not felling unswering you just don't answer.

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Re: DISK_ASYNCH_IO=TRUE, FILESYSTEMIO_OPTIONS=SETALL but v$iostat.file=ASYNC_OFF [message #684391 is a reply to message #684389]

Sun, 23 May 2021 13:34

burkinaone
Messages: 11
Registered: October 2020

Junior Member

If you don't know the answer, just don't reply. Is it that complicated?

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Re: DISK_ASYNCH_IO=TRUE, FILESYSTEMIO_OPTIONS=SETALL but v$iostat.file=ASYNC_OFF [message #684392 is a reply to message #684391]

Sun, 23 May 2021 14:10

Michel Cadot
Messages: 68757
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

A priori, if he gave you the link to the official answer from Oracle, he does know the answer which is the best and definitive answer, imho, and it could be fair to thank him instead of being rude.
It does not seem to me this kind of behavior will lead to some other help for you in the future.

[Updated on: Sun, 23 May 2021 14:11]

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Re: DISK_ASYNCH_IO=TRUE, FILESYSTEMIO_OPTIONS=SETALL but v$iostat.file=ASYNC_OFF [message #684401 is a reply to message #684392]

Tue, 25 May 2021 09:13

burkinaone
Messages: 11
Registered: October 2020

Junior Member

I found it is bug 30594167. Knowledge doesn't make noise.

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