RE: raw device
- From: "Kerber, Andrew W." <Andrew.Kerber@xxxxxxx>
- To: "Dan Norris" <dannorris@xxxxxxxxxxxxx>, oracle.rdbms@xxxxxxxxx, "ORACLE-L" <oracle-l@xxxxxxxxxxxxx>
- Date: Thu, 5 Jul 2007 08:47:28 -0500
I agree with you. Any performance you may think you gain by use of raw
devices is hard to measure, and offset by the additional administrative
problems associated with raw devices. However, I just want to have a
better idea of how they need to be set up and managed, at the very least
so I can argue the merits with the Unix types.
-----Original Message-----
From: Dan Norris [mailto:dannorris@xxxxxxxxxxxxx]
Sent: Thursday, July 05, 2007 8:37 AM
To: Kerber, Andrew W.; oracle.rdbms@xxxxxxxxx; ORACLE-L
Subject: Re: raw device
I have yet to find a situation where RAW was that compelling that I'd
use it instead of a cooked filesystem. I think that part of the reason
you don't find a lot of documentation about it is because not that much
exists. IMHO, that's because of supply and demand--that is, there's
little demand for such a thing because there isn't much use of RAW
devices these days, at least in Oracle environments. RAW devices are
more common in Sybase environments from what I've seen.
In short, my advice for managing RAW devices is to use them to create a
filesystem on and then mount that :).
Just for curiousity, I searched ML for "raw devices performance" and
found some interesting items:
29676.1: Making the decision to use raw devices (an article by Cary
Millsap from 1992)
236679.1: Comparing performance between RAW IO vs OCFS vs ext2/3
These are both a little dated, but interesting anyway.
Dan
----- Original Message ----
From: "Kerber, Andrew W." <Andrew.Kerber@xxxxxxx>
To: oracle.rdbms@xxxxxxxxx; ORACLE-L <oracle-l@xxxxxxxxxxxxx>
Sent: Thursday, July 5, 2007 8:12:43 AM
Subject: RE: raw device
I am also looking for some good device on raw device administration,
both in Oracle and and outside of Oracle.
Having come up on the Oracle developer side of the DBA business, I have
been looking for some good documentation on Raw device administration in
general. I have used raw devices in the past, but I have always just
let the Unix admin hand us the slices, and we set up softlinks to them
as we need. I think its time I learned a little more about how to set
them up.
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Sinardy Xing
Sent: Thursday, July 05, 2007 2:54 AM
To: ORACLE-L
Subject: raw device
Hi guys,
Any good link about Oracle + Non RAC + raw device administration?
thanks
--
regards,
Sinardy
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