1 ======
2 dm-ebs
3 ======
4
5
6 This target is similar to the linear target ex
7 a smaller logical block size on a device with
8 size. Its main purpose is to provide emulatio
9 devices that do not provide this emulation (i.
10
11 Supported emulated logical block sizes 512, 10
12
13 Underlying block size can be set to > 4K to te
14
15
16 Table parameters
17 ----------------
18 <dev path> <offset> <emulated sectors> [<und
19
20 Mandatory parameters:
21
22 <dev path>:
23 Full pathname to the underlying block-
24 or a "major:minor" device-number.
25 <offset>:
26 Starting sector within the device;
27 has to be a multiple of <emulated sect
28 <emulated sectors>:
29 Number of sectors defining the logical
30 1, 2, 4, 8 sectors of 512 bytes suppor
31
32 Optional parameter:
33
34 <underlying sectors>:
35 Number of sectors defining the logical
36 2^N supported, e.g. 8 = emulate 8 sect
37 If not provided, the logical block siz
38
39
40 Examples:
41
42 Emulate 1 sector = 512 bytes logical block siz
43 offset 1024 sectors with underlying devices bl
44
45 ebs /dev/sda 1024 1
46
47 Emulate 2 sector = 1KiB logical block size on
48 offset 128 sectors, enforce 2KiB underlying de
49 This presumes 2KiB logical blocksize on /dev/s
50
51 ebs /dev/sda 128 2 4
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