Troubleshooting iSCSI Mount Issues

If you encounter issues while setting up and mounting the iSCSI disk, follow these steps to troubleshoot and resolve them.

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1. Verify the Filesystem

Ensure the partition has the correct filesystem (ext4).

sudo blkid /dev/sdb1

• Output should include TYPE="ext4".

• If the filesystem is missing or incorrect, reformat the partition:

sudo mkfs.ext4 /dev/sdb1

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2. Verify the /etc/fstab Entry

Check the /etc/fstab file for errors.

sudo vi /etc/fstab

Ensure the entry looks like this:

/dev/sdb1 /docker/ubuntu_remote/ ext4 defaults,_netdev 0 0

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3. Reload systemd

Reload systemd to ensure it recognizes any changes made to /etc/fstab.

sudo systemctl daemon-reload

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4. Remount All Filesystems

Test the mount by remounting all filesystems.

sudo mount -a

If it fails, proceed to check logs for more information.

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5. Check dmesg for Errors

Inspect the kernel log to identify why the mount failed.

dmesg | tail

Look for messages indicating a "bad superblock," incorrect filesystem type, or other issues.

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6. Manually Mount for Testing

Attempt a manual mount to verify the configuration and filesystem.

sudo mount -t ext4 /dev/sdb1 /docker/ubuntu_remote/

• If this works, the issue is likely in /etc/fstab or systemd.

• If it fails, double-check the filesystem and partitioning.

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7. Verify the Disk and Partition

Recheck the disk structure and ensure the partition exists.

sudo fdisk -l

If issues persist after these steps, repeat the relevant setup steps or consult additional documentation for Synology DSM or Ubuntu iSCSI tools.