Linux Disk Yonetimi: LVM ve RAID

LVM Nedir

Logical Volume Manager. Fiziksel diskleri soyutlayarak esnek, yeniden boyutlandirilabilir disk alanlari saglar.

LVM Kurulumu

# Fiziksel disk hazirla
pvcreate /dev/sdb /dev/sdc
pvdisplay

# Volume Group olustur
vgcreate vg-data /dev/sdb /dev/sdc
vgdisplay

# Logical Volume olustur
lvcreate -L 100G -n lv-veri vg-data
lvcreate -l 100%FREE -n lv-yedek vg-data

# Formatlama ve mount
mkfs.ext4 /dev/vg-data/lv-veri
mkdir /veri
mount /dev/vg-data/lv-veri /veri

# /etc/fstab'a ekle
/dev/vg-data/lv-veri /veri ext4 defaults 0 2

LV Buyutme

# 50GB buyut
lvextend -L +50G /dev/vg-data/lv-veri
resize2fs /dev/vg-data/lv-veri  # ext4 icin

# Tum bosalani kullan
lvextend -l +100%FREE /dev/vg-data/lv-veri
resize2fs /dev/vg-data/lv-veri

Yazilimsal RAID (mdadm)

sudo apt install mdadm -y

# RAID 1 (yansima) - 2 disk
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc

# RAID 5 - minimum 3 disk
mdadm --create /dev/md1 --level=5 --raid-devices=3 /dev/sdb /dev/sdc /dev/sdd

# Durum
cat /proc/mdstat
mdadm --detail /dev/md0

# mdadm.conf kaydet
mdadm --detail --scan >> /etc/mdadm/mdadm.conf
update-initramfs -u

LVM + RAID Kombinasyonu

# Once RAID olustur
mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb /dev/sdc

# RAID uzerine LVM kur
pvcreate /dev/md0
vgcreate vg-guvenli /dev/md0
lvcreate -l 100%FREE -n lv-data vg-guvenli

LVM + RAID kombinasyonu hem esneklik hem de veri guvenligi saglar.