Professional Services - NAS Diagnostic Services Synology (Remote)

Common Synology Issues/Problems

 
Storage Creation and Repair

• How do I repair a storage pool with a drive that was accidentally removed?
• The "Repair" option cannot be selected. What can I do?
• What can I do if the storage pool or volume creation process fails?
• Why can't I repair a volume with a new hard drive with the same capacity?
• Why does it take a long time to repair a storage pool?

Storage Capacity and Expansion

• Can I create a new RAID array if other arrays in the storage pool do not meet their maximum number of drives?
• How do I calculate the largest storage configuration for my Synology NAS?
• How do I expand the storage pool or volume capacity?
• I added new drives to my one-drive SHR, but the available capacity didn't increase. What can I do?
• I added new drives to my Synology NAS, but the available capacity didn't increase. What can I do?
• I replaced drives with larger ones, but the available capacity didn't increase. What can I do?
• The "Add Drive" option cannot be selected. What can I do?
• What is the maximum single volume size of my Synology NAS?
• Which Synology NAS model can I use with Synology Expansion Units?

Storage Consumption and Release

• How can I free up the space consumed by snapshots?
• How do I configure Snapshot Replication while ensuring effective data deduplication?
• How do I know when a drive in my Synology device is full?
• My volume is running out of available space for metadata. What can I do?
• Storage Manager shows my storage usage is higher than expected. What can I do?
• The storage space in Synology Drive Server is nearly full. What can I do?
• Why can’t I use the full capacity of my two installed drives?
• Why does my hard drive size appear smaller on Synology NAS?
• I deleted files, but it does not free up the storage space. What can I do?

RAID Related

• How can I check the structure of Synology RAID 10?
• How long does it take to expand or repair a storage pool, or change its RAID type?
• How many drives do I need to create RAID group?
• I can't switch between RAID 1 and SHR. What can I do?
• Storage Manager says my storage pool is "without data protection." What does this mean?
• The "Change RAID Type" option cannot be selected. What can I do?
• What is a RAID group?
• What is Synology Hybrid RAID (SHR)?
• What is the RAID implementation for Btrfs File System on Synology NAS?
• Which models have limited support for Synology Hybrid RAID (SHR)?
• Which Synology NAS/IP SAN models support the RAID Group?
• Which Synology server models support RAID F1?

File System Related

• How do I enable File self-healing on DSM?
• How do I change an ext4 volume to a Btrfs volume?
• What can I do if I receive the message, "The system found excessive and uncorrectable metadata errors"?
• What should I do if checksum mismatch errors occur?
• What should I do if file system errors occur?
• Which file system should I use to create a volume?
• Which Synology NAS models support the Btrfs file system?

Volume Crash Related

• Storage Manager shows the system partition cannot be accessed or is damaged. What can I do?
• What can I do if one of my volumes crashed?
• What can I do to prevent volumes from crashing?
• What causes a volume to crash?
• My volume has become read-only. What can I do?

Data Migration Related

• Can I reduce the number of drives in an existing storage pool or replace the drives with smaller capacity ones?
• Can I shrink a volume on my Synology NAS?
• How do I merge two storage pools or volumes?
• How do I move my data from one volume to another on the same Synology NAS?

HDD Related

• Drive errors occurred, but I am not sure if they resulted from the drives or the drive slots. How do I check?
• How do I choose a suitable HDD for my Synology NAS/IP SAN?
• How do I recover data from a Synology NAS that is no longer accessible?
• How do I securely erase data on a drive?
• How do I identify the drives on my Synology NAS?
• I received my monthly drive health report. Is there anything I should check for?
• Some of my drives are not showing up in a Storage Manager wizard. Why is that?
• The allocation status of my SAS drives read: "Not supported by the current DSM version." What does this mean, and what can I do?
• There is an increase in my drive's bad sector count. What can I do?
• There is an increase in my drive's drive re-identification count. What can I do?
• Storage Manager shows my drive as Incompatible or Unverified. What does it mean and what can I do? (DSM 7.0 and above)
• Storage Manager shows my drive as Incompatible or Unverified. What does it mean and what can I do? (DSM 6.2.4 and above)
• What are drive partitions?
• What are PMR and SMR hard disk drives?
• What can I do if a drive is in "Warning," "Critical," or other abnormal statuses?
• What is S.M.A.R.T., and how do I use it to check my drive's health?
• What is the maximum storage capacity of a single drive supported by my Synology device?
• What should I do if my drive slots are disabled?
• What should I do if my Synology NAS cannot recognize the installed drives?
• My drive allocation status is shown as "Not Initialized." What does this mean?
• Why is the S.M.A.R.T test stuck at 90%?

SSD Related

• Frequently asked questions about using Synology SSD cache
• Which Synology NAS models support using M.2 SSDs to create storage pools?
• Can I use multiple SSDs to create an SSD cache?
• Does SSD cache use drive trays?
• How do I change the SSD cache type?
• How do I install an SSD into my Synology NAS for the best SSD cache performance?
• How do I repair a degraded or crashed SSD cache in a Synology High Availability cluster?
• Important considerations when creating SSD cache
• My SSD cache size is insufficient. What can I do?
• My Synology NAS doesn’t recognize my SSD. What should I do?
• Should I pin all Btrfs metadata to an SSD cache?
• Should I use M.2 SATA SSDs or M.2 NVMe SSDs for my Synology NAS?
• What is the minimum recommended size for my SSD cache?
• What should I do when a read-write SSD cache degrades?
• Which Synology NAS models support SSD cache?
• Why can't I use Storage Manager to run the S.M.A.R.T. test on my SSDs?