Multipath 3 device-mapper-multipathing-introduction Introduction 3 device-mapper-multipathing-configuration Configuration 3 device-mapper-multipathing-setup Setup 3 device-mapper-multipathing-usage-debug fit the format of this document): cat /proc/cmdline BOOT_IMAGE=/vmlinuz-3.2.0-17-server root=/dev/mapper/PreciseS-root ro crashkernel=384M-2G:64M,2G-:128M The crashkernel parameter has the following syntax: kdump kexec command: /sbin/kexec -p --command-line="BOOT_IMAGE=/vmlinuz-4.4.0-10-generic root=/dev/mapper/VividS--vg- root ro debug break=init console=ttyS0,115200 irqpoll maxcpus=1 nousb systemd.unit=kdump-tools

from this file. # /dev/mapper/rhel-root / xfs defaults 0 0 UUID=812b1f7c-8b5b-43da-8c06-b9999e0fe48b /boot xfs defaults 0 0 /dev/mapper/rhel-swap this file. # /dev/mapper/rhel-root / xfs defaults 0 0 UUID=812b1f7c-8b5b-43da-8c06-b9999e0fe48b /boot xfs defaults 0 0 /dev/mapper/rhel-swap 984M 18M 966M 2% /run tmpfs 984M 0 984M 0% /sys/fs/cgroup /dev/mapper/rhel-root 17G 3.9G 14G 23% / /dev/sda1 1014M 152M 863M 15% /boot /dev/sdb2

................................................................................... 75 1. Device Mapper Multipathing ................................................................................... fit the format of this document: cat /proc/cmdline BOOT_IMAGE=/vmlinuz-3.2.0-17-server root=/dev/mapper/PreciseS-root ro crashkernel=384M-2G:64M,2G-:128M The crashkernel parameter has the following kexec command: /sbin/kexec -p --command-line="BOOT_IMAGE=/vmlinuz-4.4.0-10-generic root=/dev/ mapper/VividS--vg-root ro debug break=init console=ttyS0,115200 irqpoll maxcpus=1 nousb systemd.unit=kdump-tools

[root@study ~]# df 13. Filesystem 1K-blocks Used Available Use% Mounted on 14. /dev/mapper/centos-root 10475520 3409408 7066112 33% / 15. devtmpfs 627700 0 4% /run 18. tmpfs 637568 0 637568 0% /sys/fs/cgroup 19. /dev/mapper/centos-home 5232640 67720 5164920 2% /home 20. /dev/vda2 1038336 133704 范例二：将容量结果以易读的容量格式显示出来 [root@study ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 10G 3.3G 6.8G 33% / devtmpfs 613M 0 613M 0% /dev tmpfs

列出来！ [root@study ~]# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/centos-root 10475520 3409408 7066112 33% / devtmpfs 627700 0 627700 612884 4% /run tmpfs 637568 0 637568 0% /sys/fs/cgroup /dev/mapper/centos-home 5232640 67720 5164920 2% /home /dev/vda2 1038336 133704 904632 范例二：将容量结果以易读的容量格式显示出来 [root@study ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/centos-root 10G 3.3G 6.8G 33% / devtmpfs 613M 0 613M 0% /dev tmpfs

for common network information operations (GNOME) nmap V:26, I:202 4498 test::low- level network mapper / port scanner (Nmap, console) tcpdump V:17, I:178 1340 test::low- level network traffic analyzer physical harddisks. LVM requires the following. • device-mapper support in the Linux kernel (default for Debian kernels) • the userspace device-mapper support library (libdevmapper* package) • the userspace done by using the device mapper devices created by kpartx(8) from the kpartx package as follows. # kpartx -a -v disk.img ... # mkdir -p /mnt/loop0p2 # mount -t ext4 /dev/mapper/loop0p2 /mnt/loop0p2 ..

allgemeine Netzwerkinformations-Operationen (GNOME) nmap V:25, I:199 4498 test::low- level Netzwerk-Mapper/Port-Scanner (Nmap, konsolen-basiert) tcpdump V:17, I:175 1340 test::low- level Netzwerkverkehr-Analysator erfordert folgendes: • device-mapper-Unterstützung im Linux-Kernel (Standardeinstellung für Debian-Kernel); • die Userspace-Bibliothek zur Unterstützung von device-mapper (libdevmapper*-Paket); • die /dev/loop0 Alternativ können Sie ähnliche Funktionalitäten auch erreichen, indem Sie wie hier die device-mapper-Geräte nutzen, die von kpartx(8) aus dem kpartx-Paket erzeugt werden: # kpartx -a -v disk.img add

richiede quanto segue. • la gestione di device-mapper nel kernel Linux (predefinita per i kernel Debian) • la libreria per la gestione di device-mapper in spazio utente (pacchetto libdevmapper*) • gli losetup -d /dev/loop0 In alternativa, un risultato simile può essere ottenuto utilizzando i device mapper creati da kpartx(8), contenuto nel pacchetto kpartx, nel modo seguente. # kpartx -a -v disk.img /dev/loop0p15 8192 262143 253952 124M EFI System Partition table entries are not in disk order. # ls -l /dev/mapper/ total 0 crw------- 1 root root 10, 236 Apr 2 22:45 control lrwxrwxrwx 1 root root 7 Apr 2 23:19

físicos. O LVM requer o seguinte. • suporte a device-mapper no kernel Linux (predefinido para os kernels Debian) • a biblioteca de suporte a device-mapper no espaço de utilizador (pacote (libdevmapper*) losetup -d /dev/loop0 Alternativamente, podem-se fazer efeitos semelhantes ao usar os aparelhos device mapper criados pelo kpartx(8) do pacote kpartx como a seguir. # kpartx -a -v disk.img add map loop0p1 (253:0): /dev/loop0p15 8192 262143 253952 124M EFI System Partition table entries are not in disk order. # ls -l /dev/mapper/ total 0 crw------- 1 root root 10, 236 Apr 2 22:45 control lrwxrwxrwx 1 root root 7 Apr 2 23:19

suit : — la prise en charge de device-mapper dans le noyau Linux (présent par défaut sur les noyaux Debian) ; — la bibliothèque de prise en charge de device-mapper en espace utilisateur (paquet libdevmapper*) En remplacement, des effets similaires peuvent être obtenus en utilisant les périphériques device mapper créés par kpartx(8) du paquet kpartx de la manière suivante : # kpartx -a -v disk.img add map loop0p1 /dev/loop0p15 8192 262143 253952 124M EFI System Partition table entries are not in disk order. # ls -l /dev/mapper/ total 0 crw------- 1 root root 10, 236 Apr 2 22:45 control lrwxrwxrwx 1 root root 7 Apr 2 23:19