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- dm-delay
- ========
- Device-Mapper's "delay" target delays reads and/or writes
- and maps them to different devices.
- Parameters:
- <device> <offset> <delay> [<write_device> <write_offset> <write_delay>]
- With separate write parameters, the first set is only used for reads.
- Offsets are specified in sectors.
- Delays are specified in milliseconds.
- Example scripts
- ===============
- [[
- #!/bin/sh
- # Create device delaying rw operation for 500ms
- echo "0 `blockdev --getsize $1` delay $1 0 500" | dmsetup create delayed
- ]]
- [[
- #!/bin/sh
- # Create device delaying only write operation for 500ms and
- # splitting reads and writes to different devices $1 $2
- echo "0 `blockdev --getsize $1` delay $1 0 0 $2 0 500" | dmsetup create delayed
- ]]
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