[Ocfs2-users] OCFS2 Block / Clustersize with Oracle 10gR2

[Alexei_Roudnev]

I think, that direct comparation is useless. Raw IO on file should be the
same on file system and on raw device,
in any good clustered implementation (aside of block size - if you use
read/write size much bigger than file system block size,
raw will work faster).

But it all changes in real application world - depending on the application,
results can be very different.

So, it is interesting to compare:

- Oracle RAC cluster on raw, on ASM and on OCFS, using the same SAN system;
- Oracle standalone database on ext3 FS, OCFSv2 (on single node) and on raw
device.
- Application such as main system (dont share files but share directories)
- Application which dont share directories.


----- Original Message ----- 
From: "Brian Long" <brilong at cisco.com>
To: "Sunil Mushran" <Sunil.Mushran at oracle.com>
Cc: <ocfs2-users at oss.oracle.com>
Sent: Wednesday, November 15, 2006 9:59 AM
Subject: Re: [Ocfs2-users] OCFS2 Block / Clustersize with Oracle 10gR2


> When measuring performance between raw and OCFS2 using Enterprise
> Manager and taking half-hour snapshots, are physical reads/writes per
> second directly comparable or should we only be looking at "db block
> changes", "session logical reads", etc?
>
> I've got iostat data and graphs of the storage when doing raw and OCFS2
> IO tests.  I've also got Enterprise Manager screen shots if they provide
> any value.
>
> Besides switching to Swingbench, how can we verify we are truly getting
> the same "IO" between raw and OCFS2 if the physical reads/writes are not
> in the same ball-park.
>
> In fact, when the DBA disabled async IO on the database on OCFS2, the
> IO/sec did not decrease at all.
>
> Thanks for helping.
>
> /Brian/
> -- 
>        Brian Long                             |       |
>        IT Infrastructure                  . | | | . | | | .
>        Data Center Systems                    '       '
>        Cisco Enterprise Linux                 C I S C O
>
>
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