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1 | dm-delay |
2 | ======== |
3 | |
4 | Device-Mapper's "delay" target delays reads and/or writes |
5 | and maps them to different devices. |
6 | |
7 | Parameters: |
8 | <device> <offset> <delay> [<write_device> <write_offset> <write_delay>] |
9 | |
10 | With separate write parameters, the first set is only used for reads. |
11 | Delays are specified in milliseconds. |
12 | |
13 | Example scripts |
14 | =============== |
15 | [[ |
16 | #!/bin/sh |
17 | # Create device delaying rw operation for 500ms |
18 | echo "0 `blockdev --getsize $1` delay $1 0 500" | dmsetup create delayed |
19 | ]] |
20 | |
21 | [[ |
22 | #!/bin/sh |
23 | # Create device delaying only write operation for 500ms and |
24 | # splitting reads and writes to different devices $1 $2 |
25 | echo "0 `blockdev --getsize $1` delay $1 0 0 $2 0 500" | dmsetup create delayed |
26 | ]] |
27 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
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v3.9