Server Maintenance | Updated January 2026
fsck (file system check) scans and repairs Linux filesystems. It is used to fix corrupted filesystems after unexpected shutdowns, disk errors, or file system inconsistencies.
Server Admin Only
fsck requires root access and unmounted filesystems
This is a server-level operation. Shared hosting customers cannot and do not need to run fsck. If you suspect filesystem issues on your account, open a support ticket.
01. Common Usage
# Check a filesystem (dry run, no changes)
fsck -n /dev/sda1
# Check and auto-repair
fsck -y /dev/sda1
# Force check even if filesystem seems clean
fsck -f /dev/sda1
# Check specific filesystem type
fsck.ext4 /dev/sda1Critical
Never run fsck on a mounted filesystem. This can cause catastrophic data loss. The filesystem must be unmounted first, or run fsck from a rescue/recovery environment. For the root filesystem, boot into single-user mode or a rescue disk.
02. Key Options
- -n - No changes (read-only check)
- -y - Auto-answer yes to all repair prompts
- -f - Force check even if clean
- -p - Auto-repair safe problems without prompting
- -C - Show progress bar
Filesystem Issues?
Open a Support TicketQuick Recap
- fsck checks and repairs Linux filesystems
- Never run on mounted filesystems
- -n for dry run, -y for auto-repair
- Boot into rescue mode for root filesystem checks
- Shared hosting: Contact support for filesystem issues
Server administration · Last updated March 2026 · Browse all Server Maintenance articles
