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author | Fathi Boudra <fathi.boudra@linaro.org> | 2013-04-28 09:33:08 +0300 |
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committer | Fathi Boudra <fathi.boudra@linaro.org> | 2013-04-28 09:33:08 +0300 |
commit | 3b4bd47f8f4ed3aaf7c81c9b5d2d37ad79fadf4a (patch) | |
tree | b9996006addfd7ae70a39672b76843b49aebc189 /Documentation/device-mapper/delay.txt |
Imported Upstream version 3.9.0HEADupstream/3.9.0upstreammaster
Diffstat (limited to 'Documentation/device-mapper/delay.txt')
-rw-r--r-- | Documentation/device-mapper/delay.txt | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/Documentation/device-mapper/delay.txt b/Documentation/device-mapper/delay.txt new file mode 100644 index 00000000..15adc553 --- /dev/null +++ b/Documentation/device-mapper/delay.txt @@ -0,0 +1,26 @@ +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. +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 +]] |