Re: Cook device vs Raw device
This is a multi-part message in MIME format. --------------51680D1268E0AE028317D600 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Veritas offer a product - certified for Oracle, however, works just as well from Informix which allows cooked disk chunks to be used and returns raw disk performance. The product is Storage Edition with its Quick I/O database accelerator. The base file system must be VxFS, however, the offers ease of management when using cooked chunks. The quick I/O database accelator achieves the significant performance improvement by presenting a regular file to Informix as a raw character device. This bypasses traditional UNIX file system overhead of single writer locks and double buffering - lowering CPU overhead. Worth a look. Colin Paul watson wrote: > > All things being equal Raw should be 20%(ish) faster. Parameters ... whats the platform, what is the OS, what and where are the disks, what sort of volume management are you using, > > Paul Watson > WF Software Ltd > Tel: +44 1436 674729 > Fax: +44 1436 678729 > www.wfsoftware.com/informix > # If you broke it, hide the evidence > > >>> "Matthew Tan" <tankc@singnet.com.sg> 09/14/99 10:37AM >>> > Currently our database data is stored in cooked chunks. Informix did state > that using raw device is preferably but due to time contraints(other data > was present which required repartitioning the drives) we decided to use > cooked chunks. > > I am wondering, how much slower? Any parameters to set/change when using > cooked chunks to improve the speed ? > > Thanks in advance ! > > ********************************************************************** > This email and any files transmitted with it are confidential and > intended solely for the use of the individual or entity to whom they > are addressed. If you have received this email in error please notify > the system manager. > > This footnote also confirms that this email message has been swept by > MIMEsweeper for the presence of computer viruses. > > www.mimesweeper.com > ********************************************************************** -- --------------51680D1268E0AE028317D600 Content-Type: text/x-vcard; charset=us-ascii; name="ctaberma.vcf" Content-Transfer-Encoding: 7bit Content-Description: Card for Colin Taberman Content-Disposition: attachment; filename="ctaberma.vcf" begin:vcard n:Taberman;Colin tel;cell:+44 (0)370 401 550 tel;fax:+44 (0)870 706 1015 tel;work:+44 (0)181 607 4244 x-mozilla-html:FALSE url:www.dhl.com org:DHL Systems Limited;Europe & Africa DataCentre Rationalisation Project version:2.1 email;internet:ctaberma@lhr-sys.dhl.com title:Technical Migration Consultant adr;quoted-printable:;;Kings House=0D=0AGreat West Road;Brentford;Middlesex;TW8 9AU;UK fn:Colin Taberman end:vcard --------------51680D1268E0AE028317D600--