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--- tech:notes_multipath_i_o_mpio [2025/03/24 15:06] – créée - modification externe 127.0.0.1
+++ tech:notes_multipath_i_o_mpio [2026/06/07 19:12] (Version actuelle) – modification externe 127.0.0.1
@@ Ligne 1: / Ligne 1: @@
+<!DOCTYPE markdown>
+{{tag>Brouillon SAN Disque Réseau}}
+# Notes Multipath I/O MPIO
+Voir :
+* [[https://en.wikipedia.org/wiki/Multipath_I/O|Multipath I/O (MPIO)]]
+* https://pve.proxmox.com/wiki/ISCSI_Multipath
+* https://www.suse.com/documentation/sles-12/stor_admin/data/sec_multipath_lvm.html
+* https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/DM_Multipath/mpio_setup.html
+* http://www.netexpertise.eu/en/systems/linux/multipathed-iscsi-san-disks-on-linux.html
+* http://linux.dell.com/files/whitepapers/iSCSI_Multipathing_in_Ubuntu_Server.pdf
+Conf GNU/Linux:
+* https://support.purestorage.com/Solutions/Linux/Linux_Reference/Linux_Recommended_Settings
+* https://support.purestorage.com/Solutions/Linux/Installing_and_Configuring/Configuring_Linux_Host_for_iSCSI_with_FlashArray
+* https://storageconsortium.de/content/sites/default/files/downloads/purestorage_WP_Oracle_Best_Practices.pdf
+* https://pure-storage-openstack-docs.readthedocs.io/en/wallaby/swift/section_swift-partitioning.html
+## Si LVM
+~~~bash
+sed -i -e "s/use_lvmetad \= 1/use_lvmetad \= 0/g" /etc/lvm/lvm.conf
+systemctl stop lvm2-lvmetad.service
+systemctl stop lvm2-lvmetad.socket
+#mkinitrd -f /boot/initrd-$(uname -r).img $(uname -r)
+dracut -H -f /boot/initramfs-$(uname -r).img  $(uname -r)
+yum install device-mapper-multipath
+#dracut -f --add-drivers multipath
+~~~
+// Voir gdisk et parted pour GPT //
+~~~
+# fdisk /dev/sdc
+t
+e (LVM Linux)
+w
+~~~
+Création PV, VG, LV => voir LVM
+## Suite
+~~~bash
+multipath -ll
+modprobe dm_multipath
+/sbin/mpathconf
+systemctl start multipathd
+~~~
+`/etc/multipath.conf`
+~~~c
+defaults {
+        user_friendly_names yes
+        find_multipaths yes
+}
+~~~
+Autre conf possible
+~~~
+# /lib/udev/scsi_id -g -u -d /dev/disk/by-path/*iscsi*
+14945540000000000ed34fecd6b19c9dac92c6a5ccdddce57
+~~~
+`/etc/multipath.conf`
+~~~c
+blacklist {
+        wwid .*
+}
+blacklist_exceptions {
+        wwid "14945540000000000ed34fecd6b19c9dac92c6a5ccdddce57"
+}
+~~~
+~~~bash
+multipath -r
+multipath -ll
+~~~
+## Autres
+~~~bash
+dracut -f --add-drivers multipath
+~~~
+~~~bash
+multipath -F
+multipath -v2
+multipath -r
+~~~
+### Exemple
+~~~bash
+multipath -ll
+multipathd show paths
+~~~
+/etc/multipath.conf
+~~~
+more /sys/class/fc_host/host?/port_state
+::::::::::::::
+/sys/class/fc_host/host2/port_state
+::::::::::::::
+Online
+::::::::::::::
+/sys/class/fc_host/host3/port_state
+::::::::::::::
+Online
+~~~
+~~~
+blacklist {
+        devnode "^(ram|raw|loop|fd|dm-|sr|scd|st)[0-9]*"
+        devnode "^hd[a-z]"
+        devnode "^fio[a-z]"
+        devnode "^dcssblk[0-9]*"
+        device {
+                vendor "DGC"
+                product "LUNZ"
+        }
+        device {
+                vendor "IBM"
+                product "S/390.*"
+        }
+        # don't count normal SATA devices as multipaths
+        device {
+                vendor  "ATA"
+        }
+        # don't count 3ware devices as multipaths
+        device {
+                vendor  "3ware"
+                }
+        device {
+                vendor  "AMCC"
+        }
+                # nor highpoint devices
+blacklist {
+        devnode "^(ram|raw|loop|fd|dm-|sr|scd|st)[0-9]*"
+        devnode "^hd[a-z]"
+        devnode "^fio[a-z]"
+        devnode "^dcssblk[0-9]*"
+        device {
+                vendor "DGC"
+                product "LUNZ"
+        }
+        device {
+                vendor "IBM"
+                product "S/390.*"
+        }
+        # don't count normal SATA devices as multipaths
+        device {
+                vendor  "ATA"
+        }
+        # don't count 3ware devices as multipaths
+        device {
+                vendor  "3ware"
+                }
+        device {
+                vendor  "AMCC"
+        }
+                # nor highpoint devices
+        device {
+                vendor  "HPT"
+        }
+~~~