Red Hat ENTERPRISE LINUX 4 - LVM ADMINISTRATOR Guide d'installation télécharger pdf (Page 93)

The striped Mapping Target

start

starting block in virtual device

length

length of this segment

#stripes

number of stripes for the virtual device

chunk_size

number of sectors written to each stripe before switching to the next; must be power of 2 at least

as big as the kernel page size

device

block device, referenced by the device name in the filesystem or by the major and minor numbers

in the format major:minor.

offset

starting offset of the mapping on the device

The following example shows a striped target with three stripes and a chunk size of 128:

0 73728 striped 3 128 8:9 384 8:8 384 8:7 9789824

starting block in virtual device

73728

length of this segment

striped 3 128

stripe across three devices with chunk size of 128 blocks

8:9

major:minor numbers of first device

384

starting offset of the mapping on the first device

8:8

major:minor numbers of second device

384

starting offset of the mapping on the second device

8:7

major:minor numbers of third device

9789824

starting offset of the mapping on the third device

The following example shows a striped target for 2 stripes with 256 KiB chunks, with the device

parameters specified by the device names in the file system rather than by the major and minor

numbers.

1 2 ... 88 89 90 91 92 93 94 95 96 97 98 ... 131 132

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Red Hat ENTERPRISE LINUX 4 - LVM ADMINISTRATOR Guide d'installation Page 93