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1-22 IBM Informix OnLine Database Server Administrator’s Guide
Root Dbspace Configuration Guidelines
ROOTPATH
The ROOTPATH parameter specifies the pathname of the initial chunk of the
root dbspace. ROOTPATH is stored in the OnLine reserved pages as a chunk
name.
Informix recommends that, instead of entering the actual device name for the
initial chunk, you define
ROOTPATH as a pathname that is a link to the root
dbspace initial chunk. The link enables you to quickly replace the disk where
the chunk is located. The convenience becomes important if you need to
restore your OnLine data. The restore process requires that all chunks that
were accessible at the time of the last archive are accessible when you
perform the restore. The link means that you can replace a failed device with
another device and link the new device pathname to ROOTPATH. You do not
need to wait for the original device to be repaired.
For now, select a link pathname as the chunk pathname for ROOTPATH.You
will determine the actual chunk pathname for the root dbspace when you
allocate disk space. (Refer to page 1-40.) Since the number of chunks
managed by OnLine is affected by the length of the chunk names, select a
short pathname. The default value of ROOTPATH is the link pathname
/dev/online_root.
ROOTOFFSET
ROOTOFFSET specifies the offset into the disk partition or into the device to
reach the initial chunk. Leave this worksheet field blank until you allocate
OnLine disk space. (Refer to page 1-40.) The default value of ROOTOFFSET is
0 KB.