Provided by: ndctl_63-1.3_amd64 bug

NAME

       ndctl-wait-scrub - wait for an Address Range Scrub (ARS) operation to complete

SYNOPSIS

       ndctl wait-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 POLL(2) capable sysfs file (scrub) to indicate the state of ARS. The
       scrub file maintains a running count of ARS runs that have taken place. While a current
       run is in progress a + character is emitted along with the current count. The ndctl
       wait-scrub operation waits for scrub, across all specified buses, to indicate not
       in-progress at least once.

EXAMPLE

       Wait for scrub on all nvdimm buses in the system. The json listing report at the end only
       includes the buses that support ARS operations.

           # ndctl wait-scrub
           [
             {
               "provider":"nfit_test.1",
               "dev":"ndbus3",
               "scrub_state":"idle"
             },
             {
               "provider":"nfit_test.0",
               "dev":"ndbus2",
               "scrub_state":"idle"
             }
           ]

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

           # ndctl wait-scrub e820
           error waiting for scrub completion: Operation not supported

OPTIONS

       -v, --verbose
           Emit debug messages for the ARS wait 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-start-scrub(1), ACPI
       <http://www.uefi.org/sites/default/files/resources/ACPI%206_2_A_Sept29.pdf> 6.2
       Specification Section 9.20.7.2 Address Range Scrubbing (ARS) Overview"