[dm-devel] [PATCH v2] multipath-tools: add basic info on how to use multipath-tools with NVMe devices

[Xose Vazquez Perez]

Cc: Martin Wilck <mwilck at suse.com>
Cc: Benjamin Marzinski <bmarzins at redhat.com>
Cc: Christophe Varoqui <christophe.varoqui at opensvc.com>
Cc: DM-DEVEL ML <dm-devel at redhat.com>
Signed-off-by: Xose Vazquez Perez <xose.vazquez at gmail.com>
---
 README.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/README.md b/README.md
index 2322082c..b05b1332 100644
--- a/README.md
+++ b/README.md
@@ -174,3 +174,19 @@ To enable ALUA, the following options should be changed:
 
 - Huawei OceanStor:
    "Host Access Mode" should be changed to "Asymmetric".
+
+
+NVMe
+====
+To use Device Mapper/multipath-tools with NVMe devices,
+if the Native NVMe Multipath subsystem is enabled
+( "Y" in `/sys/module/nvme_core/parameters/multipath` ),
+it has to be disabled:
+
+`echo "options nvme_core multipath=N" > /etc/modprobe.d/01-nvme_core-mp.conf`,
+regenerate the initramfs (`dracut -f` or `update-initramfs`) and reboot.
+
+Check that it is disabled(N) with:
+`cat /sys/module/nvme_core/parameters/multipath`
+or
+`systool -m nvme_core -A multipath`
-- 
2.37.1