ASM file extents and striping types
Hi,
I learned about variable file extents. It says that in a disk for file extent# 0-19999 the extent size=AU_SIZE. and for extent# 20000-39999 it is = 4*AU_SIZE and so on. But I could not understand how the larger files can be kept in larger file system (extent# 20000+) in a disk. I suppose there is no striping. Thus there should be only single disk. Then how can be the file content distribution?
Now for a Fine grained striping what I understood is, if AU_SIZE=1MB, then the extent is divided into 128k of small chunks for extent# 0-19999. That single extent is distributed into 8 disks (8*128=1024KB). If it is true then how the file contents are distributed when there are only 3 disks in a disk group?
I learned about variable file extents. It says that in a disk for file extent# 0-19999 the extent size=AU_SIZE. and for extent# 20000-39999 it is = 4*AU_SIZE and so on. But I could not understand how the larger files can be kept in larger file system (extent# 20000+) in a disk. I suppose there is no striping. Thus there should be only single disk. Then how can be the file content distribution?
Now for a Fine grained striping what I understood is, if AU_SIZE=1MB, then the extent is divided into 128k of small chunks for extent# 0-19999. That single extent is distributed into 8 disks (8*128=1024KB). If it is true then how the file contents are distributed when there are only 3 disks in a disk group?
0