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ORACLE RAC ASM disk question
Post 302168354 by robotronic on Monday 18th of February 2008 05:22:25 AM
02-18-2008
There's an oracle metalink note (368840.1) explaining that, but isn't very detailed:
Oracle's mysteries 
Quote:
"... information for the partitions and other data is contained in a special structure stored within the first 512 bytes of the disk, on the first cylinders. This structure is called VTOC (Volume Table of Contents). Actions like re-writting the VTOC will cause loosing the disk.
The output displayed above is a typical configuration, where slice 0 was formatted using the hole disk. When using ASM and during the disk discovery, the previous configuration is the cause for missing disks or disks not been discovered. The reason seems to be that having partitions that start at cylinder 0, the complete partition is interpreted as the VTOC area which is not used as a regular partition of the disk."
The output displayed above is a typical configuration, where slice 0 was formatted using the hole disk. When using ASM and during the disk discovery, the previous configuration is the cause for missing disks or disks not been discovered. The reason seems to be that having partitions that start at cylinder 0, the complete partition is interpreted as the VTOC area which is not used as a regular partition of the disk."
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