Re: Row Devices and Chunk offset

Omni Hotels Reservation Center wrote: > > Phillipe, > I can confirm this. We run AIX and when we initially set up we had to use > the same offset. The information came from the Informix engineer who > helped us configure. However, I have not seen documentation to back up > what she said. Since the configuration has never caused a problem, I have > always used the offset since. > Dave Thacker > Omni Hotels Reservation Center > > Philippe Meylan <Meylan@steria.ch> wrote in article > <622h0a$1sa@cssun.mathcs.emory.edu>... > > We are using INFORMIX 7.1x and our chunks are located on row devices. IBM > > > inform us that an offset of 512 bytes is required between the base of the > > > row device and the beginning of the chunk. This area should be used by > AIX > > for system management. > > > > My question : > > > > This requirement is undocumented and the ONINIT tools doesn't reserve any > > > offset when creating a new chunk. It's this requirement justified and can > > > be applied on any platform ? Has Informix a document explaining that The requirement is sstem dependent and actually probably unneccessary unless the device is also being used for filesystems at other offsets or is part of a software stripe set. Other OS's make similar requirements, on Ultrix it was the last 2K of the drive/device unless the drive was on a stripe set then the first 2K was also forbidden. Informix cannot keep track of all of the vendors' various ideosycroses (SP?). Art S. Kagel