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Fix: 512GB Disk Not Recognized - Azure VM

Problem

  • Azure shows 512GB disk
  • System shows only 8.8GB (100% full)
  • The partition/LVM hasn't been extended to use the full disk

Step 1: Check Current Disk Status

Run these commands to see what's happening:

# Check actual disk size (should show 512GB)
lsblk

# Check partition table
sudo fdisk -l /dev/sda  # or /dev/nvme0n1 depending on your setup

# Check LVM status
sudo pvs
sudo vgs
sudo lvs

# Check current filesystem
df -h

Step 2: Identify the Disk Device

For Azure VMs, it's usually:

  • Standard VMs: /dev/sda or /dev/sdb
  • NVMe VMs: /dev/nvme0n1 or /dev/nvme1n1

Check with:

lsblk -o NAME,SIZE,TYPE,MOUNTPOINT

Step 3: Extend the Partition (If Needed)

For Standard Disk (/dev/sda):

# Check current partition
sudo fdisk -l /dev/sda

# Use growpart to extend partition (usually partition 3 for LVM)
sudo growpart /dev/sda 3

# If growpart not available, install it:
sudo dnf install cloud-utils-growpart

For NVMe Disk (/dev/nvme0n1):

# Check current partition
sudo fdisk -l /dev/nvme0n1

# Extend partition (usually partition 3)
sudo growpart /dev/nvme0n1 3

Step 4: Resize Physical Volume

After extending the partition, resize the LVM physical volume:

# For standard disk
sudo pvresize /dev/sda3

# OR for NVMe
sudo pvresize /dev/nvme0n1p3

Step 5: Extend Logical Volume

# Extend to use all available space
sudo lvextend -l +100%FREE /dev/mapper/rocky-lvroot

Step 6: Resize Filesystem

# For xfs (most common on Rocky Linux)
sudo xfs_growfs /

# OR for ext4
sudo resize2fs /dev/mapper/rocky-lvroot

Step 7: Verify

# Should now show ~512GB available
df -h

# Verify LVM
sudo vgs
sudo lvs

Complete Command Sequence

# 1. Check disk
lsblk
sudo fdisk -l /dev/sda  # or /dev/nvme0n1

# 2. Install growpart if needed
sudo dnf install -y cloud-utils-growpart

# 3. Extend partition (adjust device and partition number)
sudo growpart /dev/sda 3  # or /dev/nvme0n1 3

# 4. Resize physical volume
sudo pvresize /dev/sda3  # or /dev/nvme0n1p3

# 5. Extend logical volume
sudo lvextend -l +100%FREE /dev/mapper/rocky-lvroot

# 6. Resize filesystem
sudo xfs_growfs /  # or resize2fs for ext4

# 7. Verify
df -h

Troubleshooting

If growpart fails:

# Check partition number
sudo fdisk -l /dev/sda | grep -E "^/dev"

# Manually extend using fdisk (advanced - be careful!)
# This requires deleting and recreating the partition
# Only do this if you know what you're doing

If pvresize fails:

# Check if physical volume exists
sudo pvs

# Check partition type
sudo blkid /dev/sda3

If you see "device is busy":

# Unmount if possible (usually can't for root)
# Or reboot after extending partition, then continue with pvresize

After Fixing: Free Up Space

Even after expanding, you should still clean up:

# Clean logs
sudo journalctl --vacuum-time=7d

# Clean package cache
sudo dnf clean all

# Restart PostgreSQL
sudo systemctl restart postgresql