Configuration: Device Mapper Multipath for Linux 183NOTE: To ensure data integrity protection, reboot a Linux host server attached toan MD3200i Series storage array using the procedure given below.Linux Host Server Reboot Best PracticesIts is recommended that you follow the procedures shown below whenrebooting your Linux host server using Device Mapper multipathing with anMD3200i Series storage array.1 Unmount all Device Mapper multipath device nodes mounted on theserver# umount 2 Stop the Device Mapper multipath service# /etc/init.d/multipathd stop3 Flush the Device Mapper multipath maps list to remove any old ormodified mappings# multipath –FNOTE: The boot operating system drive may have an entry with the DeviceMapper multipathing table. This is not affected by the multipath –Fcommand. However, using #multipath –ll should not show anymultipathing devices with model “MD3200i” or “MD3200i”.4 Log out of all iSCSI sessions from the host server to the storage array# iscsiadm –m node --logoutImportant Information About Special PartitionsWhen using Device Mapper with the MD3200i Series array, all physical disksare assigned a disk device node. This includes a special device type used forin-band management of the MD3200i Series array, known as the Access Diskor Universal Xport device.CAUTION: Certain commands, such as lsscsi, displays one or more instances ofUniversal Xport devices. These device nodes must never be accessed, mounted, orused in any way. Doing so could cause loss of communication to the storage arrayand possibly cause serious damage to the storage array, potential making datastored on the array inaccessible.
