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