From: mwilck@suse.com
To: Christophe Varoqui <christophe.varoqui@opensvc.com>,
Benjamin Marzinski <bmarzins@redhat.com>
Cc: dm-devel@lists.linux.dev, Martin Wilck <mwilck@suse.com>,
Xose Vazquez Perez <xose.vazquez@gmail.com>
Subject: [PATCH v2 13/14] README.md: Extend the section about NVMe
Date: Thu, 26 Oct 2023 19:41:52 +0200 [thread overview]
Message-ID: <20231026174153.1133-14-mwilck@suse.com> (raw)
In-Reply-To: <20231026174153.1133-1-mwilck@suse.com>
From: Martin Wilck <mwilck@suse.com>
Signed-off-by: Martin Wilck <mwilck@suse.com>
Cc: Xose Vazquez Perez <xose.vazquez@gmail.com>
---
README.md | 30 ++++++++++++++++++++----------
1 file changed, 20 insertions(+), 10 deletions(-)
diff --git a/README.md b/README.md
index b2ed1f2..2fb423b 100644
--- a/README.md
+++ b/README.md
@@ -273,15 +273,25 @@ To enable ALUA, the following options should be changed:
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.
+Using dm-multipath with NVMe
+----------------------------
-Check that it is disabled(N) with:
-`cat /sys/module/nvme_core/parameters/multipath`
-or
-`systool -m nvme_core -A multipath`
+NVMe multipath is natively supported by the Linux kernel. If for some reason
+you prefer using device mapper multipath with NVMe devices,
+you need to disable native multipathing first:
+
+ echo "options nvme_core multipath=N" > /etc/modprobe.d/01-nvme_core-mp.conf
+
+Afterwards, regenerate the initramfs (`dracut -f` or `update-initramfs`) and reboot.
+
+Using multipath-tools with native NVMe multipath
+------------------------------------------------
+
+If native NVMe multipathing is enabled, you can still use multipath-tools
+for displaying the topology and some other information about native NVMe
+multipath setups. This feature is disabled by default. To enable it, set
+`enable_foreign nvme` in the `defaults` section of `multipath.conf`.
+Commands like `multipath -ll` will then display information about NVMe
+native multipath. This support is read-only; modifying the native multipath
+configuration is not supported.
--
2.42.0
next prev parent reply other threads:[~2023-10-26 17:42 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-26 17:41 [PATCH v2 00/14] multipath: aio, systemd, and documentation improvements mwilck
2023-10-26 17:41 ` [PATCH v2 01/14] libmultipath: reduce log level of directio messages mwilck
2023-10-26 17:41 ` [PATCH v2 02/14] libmultipath: directio: don't reset ct->running after io_cancel() mwilck
2023-10-27 18:54 ` Benjamin Marzinski
2023-10-26 17:41 ` [PATCH v2 03/14] libmultipath: directio: fix error handling mwilck
2023-10-27 18:54 ` Benjamin Marzinski
2023-10-26 17:41 ` [PATCH v2 04/14] libmultipath: io_err_stat: don't free aio memory before completion mwilck
2023-10-27 18:55 ` Benjamin Marzinski
2023-10-26 17:41 ` [PATCH v2 05/14] libmultipath: io_err_stat: call io_destroy() inside free_io_err_pathvec() mwilck
2023-10-27 18:55 ` Benjamin Marzinski
2023-10-26 17:41 ` [PATCH v2 06/14] libmultipath: io_err_stat: use higher number of aio slots mwilck
2023-10-27 18:56 ` Benjamin Marzinski
2023-10-26 17:41 ` [PATCH v2 07/14] libmultipath: io_err_stat: fix error handling mwilck
2023-10-27 19:09 ` Benjamin Marzinski
2023-10-26 17:41 ` [PATCH v2 08/14] multipathd.service: require modprobe@dm_multipath.service if available mwilck
2023-10-27 19:09 ` Benjamin Marzinski
2023-10-27 20:05 ` Benjamin Marzinski
2023-10-30 11:45 ` Martin Wilck
2023-10-26 17:41 ` [PATCH v2 09/14] libmpathutil: remove systemd_service_enabled() mwilck
2023-10-26 17:41 ` [PATCH v2 10/14] multipath.conf.5: fix typo mwilck
2023-10-27 19:10 ` Benjamin Marzinski
2023-10-26 17:41 ` [PATCH v2 11/14] Makefile.inc, README.md: fix docs for prefix in split-usr case mwilck
2023-10-27 19:27 ` Benjamin Marzinski
2023-10-26 17:41 ` [PATCH v2 12/14] README.md: update mailing list and contributing information mwilck
2023-10-27 19:29 ` Benjamin Marzinski
2023-10-30 11:41 ` Martin Wilck
2023-10-26 17:41 ` mwilck [this message]
2023-10-27 19:34 ` [PATCH v2 13/14] README.md: Extend the section about NVMe Benjamin Marzinski
2023-10-26 17:41 ` [PATCH v2 14/14] README.md: fix formatting of Changelog section mwilck
2023-10-27 19:35 ` Benjamin Marzinski
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20231026174153.1133-14-mwilck@suse.com \
--to=mwilck@suse.com \
--cc=bmarzins@redhat.com \
--cc=christophe.varoqui@opensvc.com \
--cc=dm-devel@lists.linux.dev \
--cc=xose.vazquez@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.