Re: SAME !!! ( Veritas & SUN) who has experiences with stripe unit size > 1 MB

On Sat, 8 Feb 2003 15:27:48 +0100, "vob" <ga_at_aol.com> wrote:

There is a good book on this name "Oracle and Unix Performance" by Alomari.

I usually set high stripe size of 256x4=1m for Datawarehouse since I do lot of scans. Strize size * stripe width (number of devices striped) gives you a stripe depth. Solaris can do a maxio size of 1m as of 2.8. vio_max (IIRC) has to be set to 2048 in /etc/system for Veritas to do 1 meg I/O's. Your init.ora read i/o count may need adjusted based on your db_block_size.

For OLTP, I usally set at 128k or 64k. IIRC, Volume Manager defaults to 128k.
>Hi,
>
>is it possible with Solaris 8 and Veritas 3.5 to have a stripe unit size > 1
>MB
>and also max I/O Size > 1 MB
>
>I thought it might helpfull to implement SAME today with bigger stripe
>units than 1 MB , if it is also possible to increase the I/O max size
>of Solaris and Veritas 3.5
>
>We work with stripping over 10- 12 spindels , but the read /write rate per
>disk
>during sequential I/O is much smaller than on a single disk.
>
>So increasing the stripe units might help .
>
>Than on the Oracle Side the Extent size will an multiple of Max/IO Size ,
>but
>is it possible on solaris to have bigger multiblock read than 1 MB with
>Oracle 9.2 ?
>
>
>
>
Received on Sat Feb 08 2003 - 10:56:43 CST