BTRFS server stoppped

Description

Overview:We are running a Linux server with a Btrfs filesystem configured with multiple subvolumes and EFI-based boot. Recently, after a reboot, the server is failing to bring up network services—no network connectivity (no ping, no SSH access), and web services are not starting.
Current Situation:- The server’s root and Btrfs subvolumes are intact and accessible when booting into rescue mode.- Disk integrity and subvolume structure have been verified and appear healthy.- Network services do not start on normal boot, preventing remote access.- We have initiated a KVM console session to monitor boot-time behavior and gather logs.
What We Need:- An expert Linux system administrator with proven experience managing Btrfs-based servers and EFI boot environments.- Expertise diagnosing and resolving network initialization failures during system boot on such configurations.- Ability to analyze system boot logs, service statuses, and network configuration files (e.g., systemd-networkd, Netplan, NetworkManager).- Experience working with rescue environments, chrooting, and manual mounting of Btrfs subvolumes.- Capacity to develop, improve, and execute scripts for diagnostics and repair of complex boot and networking issues.
Responsibilities:- Analyze existing server configuration and logs to identify root causes of network failure at boot.- Verify and, if necessary, correct mounting procedures for Btrfs subvolumes during boot.- Validate and repair EFI bootloader configuration and files.- Inspect and troubleshoot network service configurations and startup procedures.
Ideal Admin:- Strong background in Linux system administration with deep knowledge of Btrfs filesystems.- Experience managing UEFI/EFI boot systems and GRUB bootloader configurations.- Familiarity with network configuration systems: systemd-networkd, Netplan, NetworkManager, or classic networking scripts.- Skilled in using rescue environments, chroot, and manual filesystem management.- Excellent problem-solving skills and ability to work independently with minimal supervisio