Re: Raw usage in Solaris

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

>
>
> 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 - 04:40:08 CDT