MinIO supports hot-swapping failed drives with new healthy drives. MinIO detects and heals those drives without requiring any node or deployment-level restart. MinIO healing occurs only on the replaced drive(s) and does not typically impact deployment performance.
MinIO healing ensures consistency and correctness of all data restored onto the drive. Do not attempt to manually recover or migrate data from the failed drive onto the new healthy drive.
The following steps provide a more detailed walkthrough of drive replacement.
These steps assume a MinIO deployment where each node manages drives using
/etc/fstab with per-drive labels as per the
Unmount each failed drive using
umount. For example, the following
command unmounts the drive at
Remove the failed drive(s) from the node hardware and replace it with known healthy drive(s). Replacement drives must meet the following requirements:
XFS formatted and empty.
Same drive type (e.g. HDD, SSD, NVMe).
Equal or greater performance.
Equal or greater capacity.
Using a replacement drive with greater capacity does not increase the total cluster storage. MinIO uses the smallest drive’s capacity as the ceiling for all drives in the Server Pool.
The following command formats a drive as XFS and assigns it a label to match the failed drive.
mkfs.xfs /dev/sdb -L DRIVE1
MinIO strongly recommends using label-based mounting to ensure consistent drive order that persists through system restarts.
/etc/fstab file and update as needed such that the entry for
the failed drive points to the newly formatted replacement.
If using label-based drive assignment, ensure that each label points to the correct newly formatted drive.
If using UUID-based drive assignment, update the UUID for each point based on the newly formatted drive. You can use
lsblkto view drive UUIDs.
For example, consider
$ cat /etc/fstab # <file system> <mount point> <type> <options> <dump> <pass> LABEL=DRIVE1 /mnt/drive1 xfs defaults,noatime 0 2 LABEL=DRIVE2 /mnt/drive2 xfs defaults,noatime 0 2 LABEL=DRIVE3 /mnt/drive3 xfs defaults,noatime 0 2 LABEL=DRIVE4 /mnt/drive4 xfs defaults,noatime 0 2
Cloud environment instances which depend on mounted external storage may encounter boot failure if one or more of the remote file mounts return errors or failure.
For example, an AWS ECS instances with mounted persistent EBS volumes may fail to boot with the standard
/etc/fstab configuration if one or more EBS volumes fail to mount.
You can set the
nofail option to silence error reporting at boot and allow the instance to boot with one or more mount issues.
You should not use this option on systems which have locally attached disks, as silencing drive errors prevents both MinIO and the OS from responding to those errors in a normal fashion.
Given the previous example command, no changes are required to
fstab since the replacement drive at
/mnt/drive1 uses the same
DRIVE1 as the failed drive.
mount -a to remount the drives unmounted at the beginning of this
The command should result in remounting of all of the replaced drives.
mc admin console command or
journalctl -u minio for
systemd-managed installations to monitor the server log output after
remounting drives. The output should include messages identifying each formatted
and empty drive.
mc admin heal to monitor the overall healing status on the
deployment. MinIO aggressively heals replaced drive(s) to ensure rapid recovery
from the degraded state.
Monitor the cluster for any further drive failures. Some drive batches may fail in close proximity to each other. Deployments seeing higher than expected drive failure rates should schedule dedicated maintenance around replacing the known bad batch. Consider using MinIO SUBNET to coordinate with MinIO engineering around guidance for any such operations.