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?

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  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?

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    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?

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      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?

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        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?

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          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%?

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            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?

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