diff options
author | Paul Mackerras <paulus@samba.org> | 2007-05-10 21:08:37 +1000 |
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committer | Paul Mackerras <paulus@samba.org> | 2007-05-10 21:08:37 +1000 |
commit | 2ecf042ef530dd0943e41d84b6344f507941af3e (patch) | |
tree | 73100361dd74e3f80f14c7c81ba4675948983f44 /Documentation/device-mapper/delay.txt | |
parent | 32a56ebb24f23da1bbaf24292acf85b6c04526ab (diff) | |
parent | de5603748af8bf7deac403e6ba92887f8d18e812 (diff) |
Merge branch 'linux-2.6'
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 00000000000..15adc55359e --- /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 +]] |