ndctl wait-scrub [<bus-id> <bus-id2> ... <bus-idN>] [<options>]
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.
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.
.ft C
# ndctl wait-scrub
[
{
"provider":"nfit_test.1",
"dev":"ndbus3",
"scrub_state":"idle"
},
{
"provider":"nfit_test.0",
"dev":"ndbus2",
"scrub_state":"idle"
}
]
.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 wait-scrub e820 error waiting for scrub completion: Operation not supported .ft
-v, --verbose
Copyright © 2016 - 2020, Intel Corporation. License GPLv2: GNU GPL version 2 m[blue]http://gnu.org/licenses/gpl.htmlm[]. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.
ndctl-start-scrub(1), m[blue]ACPI 6.2 Specification Section 9.20.7.2 Address Range Scrubbing (ARS) Overviewm[][1]