Re: ACFS for Database Files
- From: Marcin Przepiorowski <pioro1@xxxxxxxxx>
- To: Jared Still <jkstill@xxxxxxxxx>
- Date: Mon, 15 Dec 2014 15:31:47 +0000
Hi,
I would like to know one thing - if this is fully POSIX compliant - what
about files locks ? For most of POSIX file systems only one process can
write simultaneously to one file.James Morle had a great presentation on
Tech 14 about storage replication and potential performance issues related
to POSIX file systems.
IIRC Kevin Closson was promoting XFS as a system which can write in more
one thread to single file -
http://kevinclosson.net/2012/03/06/yes-file-systems-still-need-to-support-concurrent-writes-yet-another-look-at-xfs-versus-ext4/
If anyone (Martin ?) is going to do performance test of ACFS can you
include same test like Kevin did ?
regards,
Marcin
On Sun, Dec 14, 2014 at 5:12 PM, Jared Still <jkstill@xxxxxxxxx> wrote:
>
> ACFS is a volume on top of ASM.
>
> No reason for rebal, etc, to not work.
>
> As for being premature, that doesn't seem to be the case.
>
> ACFS is a fully POSIX compliant FS - there is an excellent discussion on
> linked in about it.
>
> Can't find it just at this moment...
>
> Jared
>
>
> On Friday, December 12, 2014, <rajendra.pande@xxxxxxx> wrote:
>
>> Interesting thought… I did think about this a bit
>>
>> Thought 1 – I doubt that ACFS in its pure form will be what will end up
>> for DB files. It will have to be some form of ASM which is what sort of
>> even cloudFS ends up using.
>>
>> I am also unsure if ACFS by itself will provide for all the bells and
>> whistles including rebalancing, data distribution across disks etc that ASM
>> does.
>>
>> Till that happens it seems premature to use ACFS directly for DB files
>>
>>
>>
>> Maybe I misunderstand the question
>>
>>
>>
>> *From:* oracle-l-bounce@xxxxxxxxxxxxx [mailto:
>> oracle-l-bounce@xxxxxxxxxxxxx] *On Behalf Of *Niall Litchfield
>> *Sent:* Friday, December 12, 2014 9:47 AM
>> *To:* ORACLE-L
>> *Subject:* ACFS for Database Files
>>
>>
>>
>> One of the things I'm mulling over right now is the use of ACFS to host
>> database files - it seems likely that this is where database files will end
>> up in some future database version. One of the things I'm interested in is
>> how many others are considering the same move. I've therefore created a
>> simple survey (2 questions, 1 optional) and would be grateful if you could
>> take a few seconds to fill it in. https://www.surveymonkey.com/r/TFRPTP5
>> As per usual when I've got a reasonable number of responses I'll share the
>> results.
>>
>>
>>
>> --
>>
>> Niall Litchfield
>> Oracle DBA
>> http://www.orawin.info
>>
>
>
> --
> Jared Still
> Certifiable Oracle DBA and Part Time Perl Evangelist
> Principal Consultant at Pythian
> Pythian Blog http://www.pythian.com/blog/author/still/
> Oracle Blog: http://jkstill.blogspot.com
> Home Page: http://jaredstill.com
>
>
--
Marcin Przepiorowski
http://oracleprof.blogspot.com
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