ASM Storage Concept - ASM DiskGroup - ASM Disks - Allocation Units (AU) - ASM Files - Extend Mgmt
AU:
ASM disks are divided into allocation units
Unit of allocating storage to a file
One megabyte in size
Small enough not to be hot
Large enough for efficient sequential access
Many allocation units in a single file
ASM disk block mapping
AU = 1MB
blocksize = 4k
Note:
50 MB space reservation for 255 ASM files.
ASM File:
datafile (segments, extents - these are logical obj.)
- ASM file (asmfile extents)
- AUs on disk
EXTENT MAP: Extents per file
ALLOCATION TABLE: AUs per disk
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