Linux Raw Device

Posted in 1999

Vikram Mittal — 4 Jun 1999 04:07:48 GMT — source: Informix-list mailing list archive (1991-1998)

Anyone know what Informix' plans are regarding support raw devices under Linux ? Until then it seems that the Linux platform ois not practical for me since we are limited to cooked devices and therfore no control over page size etc.

↪ replying to Vikram Mittal

Jonathan Leffler — Thu, 03 Jun 1999 22:08:20 -0700 — source: Informix-list mailing list archive (1991-1998)

Vikram Mittal wrote: > Anyone know what Informix' plans are regarding support raw devices > under Linux? Until then it seems that the Linux platform is not > practical for me since we are limited to cooked devices and therefore > no control over page size etc. Linux raw devices still go through the kernel buffer pool, yielding no significant performance benefit over cooked files, which also go through the kernel buffer pool. Roughly speaking, Informix will start supporting raw devices on Linux when Linux supports Unix-style raw devices on Linux. There are experimental versions of the Linux kernel with real raw device support in them; there are none in the versions released by the Linux distributors (AFAIK). -- Jonathan Leffler (jleffler@informix.com, jleffler@earthlink.net) Guardian of DBD::Informix v0.60 -- see http://www.perl.com/CPAN #include <disclaimer.h>

↪ replying to Jonathan Leffler

Colonel Panic — 5 Jun 1999 00:28:06 -0500 — source: Informix-list mailing list archive (1991-1998)

In article <37575F44.253A@earthlink.net>, Jonathan Leffler <jleffler@earthlink.net> wrote: >Vikram Mittal wrote: >> Anyone know what Informix' plans are regarding support raw devices >> under Linux? Until then it seems that the Linux platform is not >> practical for me since we are limited to cooked devices and therefore >> no control over page size etc. > >Linux raw devices still go through the kernel buffer pool, yielding no >significant performance benefit over cooked files, which also go >through the kernel buffer pool. > >Roughly speaking, Informix will start supporting raw devices on >Linux when Linux supports Unix-style raw devices on Linux. > >There are experimental versions of the Linux kernel with real raw >device support in them; there are none in the versions released by >the Linux distributors (AFAIK). Not yet, anyway. One to-be-proposed-standard method is in the works now that supposedly Linus has bought-off on... news to follow in the next couple of months or so. -- Alan Denney yosemite at accesscom.com The Early Bird gets the worm, but the Second Mouse gets the cheese.