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Re: Raw usage in Solaris

From: Praveen Tummala <praveen.tummala_at_teleatlas.com>
Date: Wed, 15 May 2002 09:43:01 GMT
Message-ID: <3CE22D9A.95ECAC81@teleatlas.com>

Praveen Tummala wrote:

> Nuno Souto wrote:
>
> > yong321_at_yahoo.com (Yong Huang) wrote in message news:<b3cb12d6.0205140906.1379e652_at_posting.google.com>...
> >
> > > You don't need Veritas or SDS to use raw. In fact, if you do, that's
> > > not called raw any more. To allow oracle to read from the raw device,
> > > run chown oracle:dba [thedevice] as root.
> >
> > Thanks.
> >
> > That's what I thought. So I went to /dev/rdsk and did that for the
> > "cxtydzsw" that I wanted to use. It silently finished, but no change
> > whatsoever to the ownership when I checked with "ls -al".
>
> 1. man chown
> 2. because "cxtydzsw" is a soft link to the original device, use -h and -R options of chown to change the
> permissions

ooops...it should be to change the "ownership"

>
>
> >
> >
> > Then I went to Sun Solaris support site and dug for raw devices.
> > Found a reco to use SDS or VxV in order to set this, as Solaris
> > will silently ignore the ownership change unless there is an LVM
> > of some sort in place.
>
> Wrong.
>
> Regards,
> Praveen.
>
> >
> >
> > "format" doesn't allow ownership changes, all it does is manage
> > the partitions and/or format/label the disk.
> >
> > > Direct I/O may speed up or slow down db file read depending on whether
> > > the file is sequentially read (at OS or filesystem level). Filesystem
> > > page cache helps a lot by prefetch if the read is sequential. But
> > > using direct I/O allows you to give the memory that otherwise would be
> > > part of page cache to Oracle buffer cache, which manages Oracle data
> > > caching more intelligently. Read Steve Adams' Ixora News - March 2002
> > > newsletter.
> >
> > I'm aware of all this, chief. Been using raw since V6 Oracle,
> > many moons ago. It's in configuring Solaris without an LVM that
> > I have the problem, not in using raw itself.
Received on Wed May 15 2002 - 04:43:01 CDT

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