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Title

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1		-Commands
	1	+Linux General Documentation

Parent

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1		-Documentation.Miscellaneous.Linux.WebHome
	1	+iXPath Documentation.WebHome

Content

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17	17	down
18	18	{{/code}}
19	19
20		-== Test disk speed ==
21		-
22		-dd command allows to copy all or parts of a disk by bytes block without impact from content structure of the disk.
23		-
24		-(% class="box infomessage" %)
25		-(((
26		-Do not use dd to duplicate a disk. Prefer ddrescue command
27		-)))
28		-
29		-Command structure
30		-
31		-(% class="box" %)
32		-(((
33		-dd if=<source> of=<target> bs=<block size> count=<number of blocks> oflag=<flag>
34		-)))
35		-
36		-oflag: 'dsync' to use synchronized I/O for data
37		-
38		-(% class="box warningmessage" %)
39		-(((
40		-Use dd command with caution as it can cause severe dammage to the system
41		-)))
42		-
43		- {{code language="shell"}}root@v2-dvp-sandbox-ixp-ubu-91:/home/ixp_adm# dd if=/dev/zero of=/tmp/test2.img bs=512 count=1000 oflag=dsync
44		-1000+0 records in
45		-1000+0 records out
46		-512000 bytes (512 kB, 500 KiB) copied, 1.22846 s, 417 kB/s{{/code}}
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