1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
'\" t
.\" Title: nvme-compare
.\" Author: [FIXME: author] [see http://www.docbook.org/tdg5/en/html/author]
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\" Date: 08/05/2024
.\" Manual: NVMe Manual
.\" Source: NVMe
.\" Language: English
.\"
.TH "NVME\-COMPARE" "1" "08/05/2024" "NVMe" "NVMe Manual"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
nvme-compare \- Send an NVMe Compare command, provide results
.SH "SYNOPSIS"
.sp
.nf
\fInvme\-compare\fR <device> [\-\-start\-block=<slba> | \-s <slba>]
[\-\-block\-count=<nlb> | \-c <nlb>]
[\-\-data\-size=<size> | \-z <size>]
[\-\-metadata\-size=<metasize> | \-y <metasize>]
[\-\-ref\-tag=<reftag> | \-r <reftag>]
[\-\-data=<data\-file> | \-d <data\-file>]
[\-\-metadata=<meta> | \-M <meta>]
[\-\-prinfo=<prinfo> | \-p <prinfo>]
[\-\-app\-tag\-mask=<appmask> | \-m <appmask>]
[\-\-app\-tag=<apptag> | \-a <apptag>]
[\-\-limited\-retry | \-l]
[\-\-force\-unit\-access | \-f]
[\-\-dir\-type=<type> | \-T <type>]
[\-\-dir\-spec=<spec> | \-S <spec>]
[\-\-dsm=<dsm> | \-D <dsm>]
[\-\-show\-command | \-V]
[\-\-dry\-run | \-w]
[\-\-latency | \-t]
[\-\-storage\-tag<storage\-tag> | \-g <storage\-tag>]
[\-\-storage\-tag\-check | \-C]
[\-\-force]
[\-\-output\-format=<fmt> | \-o <fmt>] [\-\-verbose | \-v]
[\-\-timeout=<timeout>]
.fi
.SH "DESCRIPTION"
.sp
The Compare command reads the logical blocks specified by the command from the medium and compares the data read to a comparison data buffer transferred as part of the command\&. If the data read from the controller and the comparison data buffer are equivalent with no miscompares, then the command completes successfully\&. If there is any miscompare, the command completes with an error of Compare Failure\&. If metadata is provided, then a comparison is also performed for the metadata\&.
.SH "OPTIONS"
.PP
\-s <slba>, \-\-start\-block=<slba>
.RS 4
64\-bit address of the first block to access\&.
.RE
.PP
\-c <nlb>, \-\-block\-count=<nlb>
.RS 4
Number of blocks to be accessed (zero\-based)\&.
.RE
.PP
\-z <size>, \-\-data\-size=<size>
.RS 4
Size of data to be compared in bytes\&.
.RE
.PP
\-y <metasize>, \-\-metadata\-size=<metasize>
.RS 4
Size of metadata to be transferred in bytes\&.
.RE
.PP
\-r <reftag>, \-\-ref\-tag=<reftag>
.RS 4
Reference Tag for Protection Information
.RE
.PP
\-d <data\-file>, \-\-data=<data\-file>
.RS 4
Data file\&.
.RE
.PP
\-M <meta>, \-\-metadata=<meta>
.RS 4
Metadata file\&.
.RE
.PP
\-p <prinfo>, \-\-prinfo=<prinfo>
.RS 4
Protection Information and check field\&.
.TS
allbox tab(:);
lt lt
lt lt
lt lt
lt lt
lt lt
lt lt.
T{
Bit
T}:T{
Description
T}
T{
3
T}:T{
PRACT: Protection Information Action\&. When set to 1, PI is stripped/inserted on read/write when the block format\(cqs metadata size is 8\&. When set to 0, metadata is passes\&.
T}
T{
2:0
T}:T{
PRCHK: Protection Information Check:
T}
T{
2
T}:T{
Set to 1 enables checking the guard tag
T}
T{
1
T}:T{
Set to 1 enables checking the application tag
T}
T{
0
T}:T{
Set to 1 enables checking the reference tag
T}
.TE
.sp 1
.RE
.PP
\-m <appmask>, \-\-app\-tag\-mask=<appmask>
.RS 4
App Tag Mask for Protection Information
.RE
.PP
\-a <apptag>, \-\-app\-tag=<apptag>
.RS 4
App Tag for Protection Information
.RE
.PP
\-l, \-\-limited\-retry
.RS 4
Number of limited attempts to media\&.
.RE
.PP
\-f, \-\-force\-unit\-access
.RS 4
FUA option to guarantee that data is stored to media\&.
.RE
.PP
\-T <type>, \-\-dir\-type=<type>
.RS 4
Optional directive type\&. The nvme\-cli only enforces the value be in the defined range for the directive type, though the NVMe specification (1\&.3a) defines only one directive, 01h, for write stream identifiers\&.
.RE
.PP
\-S <spec>, \-\-dir\-spec=<spec>
.RS 4
Optional field for directive specifics\&. When used with write streams, this value is defined to be the write stream identifier\&. The nvme\-cli will not validate the stream requested is within the controller\(cqs capabilities\&.
.RE
.PP
\-D <dsm>, \-\-dsm=<dsm>
.RS 4
The optional data set management attributes for this command\&. The argument for this is the least significant 8 bits of the DSM field in a write command; the most significant 16 bits of the field come from the directive specific field, if used\&. This may be used to set attributes for the LBAs being written, like access frequency, type, latency, among other things, as well as yet to be defined types\&. Please consult the NVMe specification for detailed breakdown of how to use this field\&.
.RE
.PP
\-V, \-\-show\-cmd
.RS 4
Print out the command to be sent\&.
.RE
.PP
\-w, \-\-dry\-run
.RS 4
Do not actually send the command\&. If want to use \-\-dry\-run option, \-\-show\-cmd option
\fImust\fR
be set\&. Otherwise \-\-dry\-run option will be
\fIignored\fR\&.
.RE
.PP
\-t, \-\-latency
.RS 4
Print out the latency the IOCTL took (in us)\&.
.RE
.PP
\-g <storage\-tag>, \-\-storage\-tag=<storage\-tag>
.RS 4
Variable Sized Expected Logical Block Storage Tag(ELBST)\&.
.RE
.PP
\-C, \-\-storage\-tag\-check
.RS 4
This flag enables Storage Tag field checking as part of end\-to\-end data protection processing\&.
.RE
.PP
\-\-force
.RS 4
Ignore namespace is currently busy and performed the operation even though\&.
.RE
.PP
\-o <fmt>, \-\-output\-format=<fmt>
.RS 4
Set the reporting format to
\fInormal\fR,
\fIjson\fR
or
\fIbinary\fR\&. Only one output format can be used at a time\&.
.RE
.PP
\-v, \-\-verbose
.RS 4
Increase the information detail in the output\&.
.RE
.PP
\-\-timeout=<timeout>
.RS 4
Override default timeout value\&. In milliseconds\&.
.RE
.SH "EXAMPLES"
.sp
No examples yet\&.
.SH "NVME"
.sp
Part of the nvme\-user suite
|
