1NDCTL-START-SCRUB(1)             ndctl Manual             NDCTL-START-SCRUB(1)
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NAME

6       ndctl-start-scrub - start an Address Range Scrub (ARS) operation
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SYNOPSIS

9       ndctl start-scrub [<bus-id> <bus-id2> ... <bus-idN>] [<options>]
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DESCRIPTION

12       NVDIMM Address Range Scrub is a capability provided by platform
13       firmware that allows for the discovery of memory errors by system
14       software. It enables system software to pre-emptively avoid accesses
15       that could lead to uncorrectable memory error handling events, and it
16       otherwise allows memory errors to be enumerated.
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18       The kernel provides a sysfs file (scrub) that when written with the
19       string "1\n" initiates an ARS operation. The ndctl start-scrub
20       operation starts an ARS, across all specified buses, and the kernel in
21       turn proceeds to scrub every persistent memory address region on the
22       specified buses.
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EXAMPLE

25       Start a scrub on all nvdimm buses in the system. The json listing
26       report only includes the buses that support ARS operations.
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28           # ndctl start-scrub
29           [
30             {
31               "provider":"nfit_test.1",
32               "dev":"ndbus3",
33               "scrub_state":"active"
34             },
35             {
36               "provider":"nfit_test.0",
37               "dev":"ndbus2",
38               "scrub_state":"active"
39             }
40           ]
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42       When specifying an individual bus, or if there is only one bus in the
43       system, the command reports whether ARS support is available.
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45           # ndctl start-scrub e820
46           error starting scrub: Operation not supported
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OPTIONS

49       -v, --verbose
50           Emit debug messages for the ARS start process
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53       Copyright (c) 2016 - 2019, Intel Corporation. License GPLv2: GNU GPL
54       version 2 <http://gnu.org/licenses/gpl.html>. This  is  free  software:
55       you  are  free  to change and redistribute it. There is NO WARRANTY, to
56       the extent permitted by law.
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SEE ALSO

59       ndctl-wait-scrub(1), ACPI <http://www.uefi.org/sites/default/files/
60       resources/ACPI%206_2_A_Sept29.pdf>  6.2  Specification Section 9.20.7.2
61       Address Range Scrubbing (ARS) Overview"
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65ndctl                             2019-05-10              NDCTL-START-SCRUB(1)
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