How To create raw devices in Red Hat 5.2
Hi, Does any one knows how to create a raw device for a Informix chunk? TIA NB
Ricardo wrote: > > Hi, > > Does any one knows how to create a raw device for a Informix chunk? > > TIA > NB Hi Ricardo, are you sure that Informix supports "raw devices" for your Linux workstation ? Far as I know there's no way to create raw devices - sure, you can try by using "mknod" but, I guess your system will tell you the same as my "SuSe" Linux. Anyhow, the I/O performs pretty good. I got a throughput of about 4MB/sec for random write operations per disk. That's much more than on other platforms. Best regards Stefan Weideneder
I asked the same question a month or so ago and put it mildly, i believe you can create raw devices.... known as special character devices.... still don't know how, yet, i've read in the release notes that the kernel doesn't raw devices buffering or none-buffering ( i can't remember ), so they said they don't support it, due to the fact that there will be no performance gains over fried (cooked) files. Does that make any sense? Therefore cooked files has the same performance as raw disk. In article <36C76008.2DF2319B@weideneder.de>, Stefan Weideneder <stefan@weideneder.de> wrote: > Ricardo wrote: > > > > Hi, > > > > Does any one knows how to create a raw device for a Informix chunk? > > > > TIA > > NB > > Hi Ricardo, > > are you sure that Informix supports "raw devices" for your > Linux workstation ? Far as I know there's no way to create > raw devices - sure, you can try by using "mknod" but, I guess > your system will tell you the same as my "SuSe" Linux. > > Anyhow, the I/O performs pretty good. I got a throughput > of about 4MB/sec for random write operations per disk. > That's much more than on other platforms. > > Best regards > > Stefan Weideneder > -----------== Posted via Deja News, The Discussion Network ==---------- http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own
In article <7a9b9f$gtg$1@nnrp1.dejanews.com>, neil_rutherford@yahoo.com wrote: I have not done much RDBMS in a while, but I know with Sybase, you can spacify a partition that has not been allocated by a filesystem. I suspect all you would have to do is have the partition created on the hard drive, and then point the database at it. The raw linux disk drivers should work, as long as Informix knows how to deal with them. Brad > I asked the same question a month or so ago and put it mildly, > i believe you can create raw devices.... known as special character > devices.... still don't know how, yet, i've read in the release > notes that the kernel doesn't raw devices buffering or none-buffering ( i > can't remember ), so they said they don't support it, due to the fact that > there will be no performance gains over fried (cooked) files. > Does that make any sense? > Therefore cooked files has the same performance as raw disk. > > In article <36C76008.2DF2319B@weideneder.de>, > Stefan Weideneder <stefan@weideneder.de> wrote: > > Ricardo wrote: > > > > > > Hi, > > > > > > Does any one knows how to create a raw device for a Informix chunk? > > > > > > TIA > > > NB > > > > Hi Ricardo, > > > > are you sure that Informix supports "raw devices" for your > > Linux workstation ? Far as I know there's no way to create > > raw devices - sure, you can try by using "mknod" but, I guess > > your system will tell you the same as my "SuSe" Linux. > > > > Anyhow, the I/O performs pretty good. I got a throughput > > of about 4MB/sec for random write operations per disk. > > That's much more than on other platforms. > > > > Best regards > > > > Stefan Weideneder > > > > -----------== Posted via Deja News, The Discussion Network ==---------- > http://www.dejanews.com/ Search, Read, Discuss, or Start Your Own