Re: raw devices - general questions

David Williams wrote: [clip] > Sort of Informix can not access any part of the drive beyond the 2 > gigabyte limit. This is because it uses the lseek() system call which > only allow you to move to a postion up to 2 gigabytes into the drive. > > Therefore you need to use a Logical Volume Manager (LVM) to split the > drive into what appears to be 2 x 2Gb) drives. Rather than one entry > in /dev for the drive you will have two entrys in /dev one for each > Logical Volume. > > Also be aware that if you are using ICL's Logical Volume Manager you > will need to disable Informix Online's Kernel Asynchronous I/O feature > by setting the environment variable KAIOOFF to 1 before you start > Online 7.13. If not you will probably get data corruption (we got the > Unix root partition (/) corrupted so bad it was not recoverable and we > had to restore the complete machine from backups). This happen to us > 4 times before Informix admiteed a problem... > > PS No part of this posting may be used by Oracle marketing people. > I'm not having Oracle quote my Usenet posting as they have done to > other people. Copyright David Williams 1996. > > -- > David Williams Am I missing something here? Why not just use the format command to partition the disk into (3) partitions. The first one is a single track to reserve space for the disk lable data, the other (2) split up the rest, into just under 2GB each. Create (2) chuncks, each of which references the raw device file for each partition (slices). The offsets will be zero for each. I havn't tried it, but I would think it should work.