1. nbd (debian)¶

На сервере¶

apt-get install qemu-utils не ниже 2.1

qemu-nbd -p 2000 -b 192.168.122.101 -f raw /dev/ssd6/hermes-storage &

На клиенте¶

nbd-client 192.168.122.101 2000 /dev/nbd0

Negotiation: ..size = 716800MB
bs=1024, sz=751619276800 bytes

vi /etc/lvm/lvm.conf

filter = [ "a|^/dev/[hs]d[a-f][0-9]$|", "a|^/dev/nbd[0-9]+$|", "r/.*/" ]

pvcreate /dev/nbd0

nbd (gentoo)¶

На сервере¶

lvcreate -L 210g -n temp-space vg-name
qemu-nbd -p 51621 -b 172.31.53.254 -f raw /dev/vg-name/temp-space &

На клиенте¶

modprobe nbd
modprobe raid1
echo 1 > /sys/module/raid1/parameters/max_queued_requests
# 30000 == 30Мбайт/сек ~ 300Мбит/сек
echo 30000 > /proc/sys/dev/raid/speed_limit_max
busybox nbd-client 172.31.53.254 51621 /dev/nbd0
# sed -i '/filter = /s:"r|/dev/nbd.*|", ::' /etc/lvm/lvm.conf
pvcreate /dev/nbd0
vgextend data /dev/nbd0
lvconvert -m1 --type raid1 data/static /dev/nbd0
lvs

  LV     VG      Attr       LSize   Pool Origin Data%  Move Log Cpy%Sync Convert
  static data    rwi-aor--- 200.00g                                 0.15     

После завершения синхронизации¶

https://redmine.ekb-info.ru/projects/gnu-linux/wiki/Lvm-mirroring