readlvcopy Command
Purpose
Reads a specific mirror copy of a logical volume.
Syntax
readlvcopy -d device [ -c copy | -C copy | -b | -p mirrorpool ] [ -n number_of_blocks ] [ -o outfile ] [ -s skip] [ -S seek ]
Description
Flags
| Item | Description |
|---|---|
| -d device | Logical volume special device file to be read from |
| -c copy | Requested mirror copy to read from. Valid values are 1, 2, or 3 for the first, second, or third copy of the data. Data is read even if the logical partition has been marked stale. The default is the first copy of the data. |
| -C copy | Requested mirror copy to read from. Valid values are 1, 2, or 3 for the first, second, or third copy of the data. Stale logical partitions are not read. |
| -b | Read mirror copy marked as online backup. |
| -n number_of_blocks | Number of 128K blocks to read |
| -o outfile | Destination file. The default is stdout |
| -p mirrorpool |
Read from the copy of the data that is associated to the specified mirror pool. Data is read even if the logical partition has been marked stale. The default is the first copy of the data. If the specified mirror pool does not exist in the volume group, the readlvcopy command fails. |
| -s skip | Number of 128K blocks to skip into device. |
| -S seek | Number of 128K blocks to seek into outfile |
Example
To read the first 128 KB block of data from the copy, which is associated with the mp1
mirror pool, of the device /dev/rlv00, run the following
command:
readlvcopy -d /dev/rlv00 -p mp1 -n 1