offset - informix chunk


 
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# 1  
Old 01-27-2003
offset - informix chunk

Hello all,

I am trying to add chunks to my informix dataspace. I have one dataspace ( the rootdbs ) and the new chunk is a raw device. Precisely slice1 on my new external harddisk.

The question is, what should be the offset value. The document says, the offset is used by the engine to identify the beginning of the file. Can I give some arbitary value, so that it skips the initial blocks ( like 300 ). Or is there any logical method to identify the best offset ?

The informix version is 5.1 and platform is Sun OS 5.5.1

Thanks in advance.
# 2  
Old 01-27-2003
With SunOS you can use the format command to slice a disk up any way that you want. Ideally, you should create a slice that belongs to Informix alone and then use an offset of zero since Informix can use the entire slice.

If you couldn't define your own slices, you might need, as one example, to have one area serve as both swap and an informix chunk. If the area was, say, 2 gigs, you might define a 1 gig swap area. Then informix would use the same area with an offset of 1 gig.

The only problem you might encounter is the disk label itself. You don't want to overwrite that. If your slice 1 starts on cylinder zero, you must tell informix to skip the first sector so that you don't clobber the label. I would move slice 1 off of cylinder zero and still use an Informix offset of zero. If you really must start the slice on cylinder zero, then use an offset of 512 to preserve the label.
 
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