Re: Row Devices and Chunk offset

> 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 ? This is documented in the DSA Administrator's Guide. In the chapter on Managing Disk Space (chapter 15 in 7.1 version), there is discussion on allocating raw space, with a subtopic "Do You Need to Specify an Offset?". Because not all operating systems require an offset, and because you can use raw or cooked space (and cooked shouldn't require an offset for any system overhead), the Informix tools do not reserve any offset unless you specify one. Mark Collins mcollins@us.dhl.com The problem lies in how easily and dangerously we forget that manipulating things is not the same as understanding them.