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IDS Forum

Re: Cooked files vs. raw partitions

Posted By: Martin Fuerderer
Date: Tuesday, 23 March 2004, at 9:47 a.m.

In Response To: Cooked files vs. raw partitions (BRIAN MCLAUGHLIN)

Hi,

generally speaking, raw devices are the preferred choice - as
everybody else who responded so far has already said.

However, performance of raw devices and cooked files might
vary rather widely, depending on several factors like:
- operating system and version of it,
- file system in use for cooked files,
- disk storage hardware (including controllers),
- (software) driver availability for the respective hardware,
- kernel asynchoneous I/O (KAIO) availability.

E.g. consider Linux :
- there are now several file system types to choose from, some
performing very well for IDS using cooked files (e.g. ext2), some
rather badly (e.g. reiserfs) and some may be mediocre (e.g. xfs
or jfs ?),
- there is raw device support, but KAIO is only now beginning to
be supported by Linux distributions (kernel 2.6),
- so you might find that a "fast filesystem" for cooked files might be
better performing than raw devices without KAIO.

Once more this shows that reaping the last 10 % of possible
performance increase will also cost the most effort. In this case
mostly for determining which combination of parameters for the
above factors will be best for your scenario/environment ...

So to the T-shirt print "forever raw" I would add (in smaller print):
"most of the time" ... ;)

Regards,
Martin
--
Martin Fuerderer
IBM Informix Development Munich
Data Management Solutions




"BRIAN MCLAU...." <bmclaugh@georgefox.edu>
Sent by: forum.subscriber@iiug.org
22.03.2004 20:58

To
ids@iiug.org
cc

Subject
Cooked files vs. raw partitions [2705]






We're preparing to update our application software which requires some
database structure changes. Our plan is to copy our current database, and
let the vendor update the copy. This brings up the question of
cooked-files vs. raw-partitions.

When we first installed IDS, Informix' recommendation was to use raw disk
partitions. When I took a couple classes from Informix, I seem to recall
that they changed their recommendation to cooked files.

What is the general consensus on this amongst users?

Thanks,

Brian McLaughlin
Administrative Computing
George Fox University
(503) 554-2587



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