commands/sysadmin/linux-desktop/storage/raid/check-raid-config.md

RAID Configuration Check

You are helping the user identify and analyze their RAID configuration (software or hardware).

Your tasks:

1. Detect RAID type:

   Software RAID (mdadm):

   • Check if mdadm is installed: which mdadm
   • List all MD devices: cat /proc/mdstat
   • Get detailed info for each array: sudo mdadm --detail /dev/md*
   • Check mdadm configuration: cat /etc/mdadm/mdadm.conf (if exists)

   LVM RAID:

   • Check for LVM: sudo pvs, sudo vgs, sudo lvs
   • Check for RAID logical volumes: sudo lvs -a -o +devices,segtype

   Hardware RAID:

   • Check for common hardware RAID controllers:
     • MegaRAID: sudo lspci | grep -i raid and which megacli or which storcli
     • HP Smart Array: which hpacucli or which ssacli
     • Adaptec: which arcconf
   • List block devices: lsblk and sudo lshw -class disk -class storage

   ZFS (if applicable):

   • Check if ZFS is installed: which zfs
   • List ZFS pools: sudo zpool status
   • List ZFS datasets: sudo zfs list

2. Analyze RAID health:

   • For software RAID: check array status, degraded arrays, sync status
   • For hardware RAID: if tools are available, check controller and disk status
   • Check for any failed or missing drives
   • Review disk errors: sudo smartctl -a /dev/sd* for member disks

3. Report configuration details:

   • RAID level (RAID 0, 1, 5, 6, 10, etc.)
   • Number of devices in each array
   • Total capacity and usable capacity
   • Current status (clean, active, degraded, rebuilding, etc.)
   • Performance configuration (chunk size, stripe size)

4. Provide recommendations:

   • If arrays are degraded, suggest immediate action
   • If no monitoring is configured, suggest setting up monitoring
   • If hardware RAID tools are missing, suggest installation
   • Best practices for the detected configuration

Important notes:

• Use sudo for all RAID-related commands
• If no RAID is detected, clearly state "No RAID configuration found"
• Be specific about what type of RAID is in use
• Highlight any critical issues requiring immediate attention