Re: Veritas Quickio and DB_BLOCK

From: Gaja Krishna Vaidyanatha <oraperfman_at_yahoo.com>
Date: Thu, 04 Oct 2001 18:40:47 -0700
Message-ID: <F001.003A2C7B.20011004185017@fatcity.com>

Hi George,

I wanted to make sure that the information I was giving you was as accurate and current as possible. This prompted me to have one of my guys to check it out in the Veritas Documentation, before I sent out the note. The documentation for version 3.3, clearly states that the default logical blocksize for Veritas is 1024 bytes. Your take about the automatic scale-up for very large files may also be true.

Regardless, I think the point I was trying to drive home is simple - You need to ensure "equality" of db_block_size and the filesystem block size. The default value may change across releases and that is not something that we have control over or should depend on. And I am very glad to hear that your environment adheres to that. Good for you!!!

Cheers,

Gaja

George Schlossnagle <george_at_omniti.com> wrote:
> > I/O tuning fundamentals require us to ensure that
> the
> > filesystem blocksize = db_block_size. The default
> > filesystem blocks size in Veritas is 1K and it is
> more
> > than likely that almost every Veritas filesystem
> that
> > is out there is in fact created with an 1K block
> size.
> > This is true even though we are talking about
> Quick
> > I/O which works on a Veritas-simulated raw device.
>
> I don't believe this is true. I believe Veritas
> automatically scales it's
> default block size depending on the size of the
> partitiion you create,
> either 1k, 2k, 4k or 8k depending on the creation
> size. I would also like
> to chip in that I run 8k block size and create all
> my file systems with 8k
> block size specified. I may just be the exception.
>
>
>
> --
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> http://www.orafaq.com
> --
> Author: George Schlossnagle
> INET: george_at_omniti.com
>
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Gaja Krishna Vaidyanatha
Director, Storage Management Products,
Quest Software, Inc.
Co-author - Oracle Performance Tuning 101 http://www.osborne.com/database_erp/0072131454/0072131454.shtml

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Author: Gaja Krishna Vaidyanatha
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Received on Thu Oct 04 2001 - 20:40:47 CDT

Re: Veritas Quickio and DB_BLOCK_SIZE