NAME

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

SYNOPSIS

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

DESCRIPTION

       NVDIMM Address Range Scrub is a capability provided by platform firmware that allows for the discovery of
       memory errors by system software. It enables system software to pre-emptively avoid accesses that could
       lead to uncorrectable memory error handling events, and it otherwise allows memory errors to be
       enumerated.

       The kernel provides a sysfs file (scrub) that when written with the string "1\n" initiates an ARS
       operation. The ndctl start-scrub operation starts an ARS, across all specified buses, and the kernel in
       turn proceeds to scrub every persistent memory address region on the specified buses.

EXAMPLE

       Start a scrub on all nvdimm buses in the system. The json listing report only includes the buses that
       support ARS operations.

           .ft C
           # ndctl start-scrub
           [
             {
               "provider":"nfit_test.1",
               "dev":"ndbus3",
               "scrub_state":"active"
             },
             {
               "provider":"nfit_test.0",
               "dev":"ndbus2",
               "scrub_state":"active"
             }
           ]
           .ft

       When specifying an individual bus, or if there is only one bus in the system, the command reports whether
       ARS support is available.

           .ft C
           # ndctl start-scrub e820
           error starting scrub: Operation not supported
           .ft

OPTIONS

       -v, --verbose
           Emit debug messages for the ARS start process

COPYRIGHT

       Copyright (c) 2016 - 2018, Intel Corporation. License GPLv2: GNU GPL version 2
       http://gnu.org/licenses/gpl.html. This is free software: you are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO

       ndctl-wait-scrub(1), ACPI 6.2 Specification Section 9.20.7.2 Address Range Scrubbing (ARS) Overview[1]

NOTES

        1. ACPI 6.2 Specification Section 9.20.7.2 Address Range Scrubbing (ARS) Overview
           http://www.uefi.org/sites/default/files/resources/ACPI%206_2_A_Sept29.pdf

ndctl 61.2+                                        08/01/2018                               NDCTL-START-SCRUB(1)