Applicable Products
QuTS hero, QES
Background
WORM (write once read many) technology ensures that once data is written, its state remains unchanged. The data cannot be deleted or modified, effectively locking the data state. WORM is primarily used for long-term data preservation or compliance applications, as well as for cybersecurity protection against ransomware encryption.
One of the WORM settings you can configure is the WORM retention period. This period determines how long WORM applies to the files and folders in a WORM shared folder.
Details
A WORM retention period is not based on system time, but instead based on the uptime of the storage pool that contains the WORM shared folder.
Each storage pool has its own WORM clock that determines when a WORM retention period ends. The following situations may pause the WORM clock:
- Shutting down the system
- Restarting the system
- Detaching the storage pool
- Detaching a disk in the storage pool
- Detaching the enclosure that contains the storage pool
- Locking the storage pool if the pool is an SED secure storage pool
- Updating the NAS firmware
- When the number of abnormal disks in the storage pool's RAID group exceeds the RAID group's disk failure tolerance
When any of the above events occurs, the WORM clock automatically pauses. The WORM clock only resumes when the interrupting event ends or returns to a normal state. However, due to the pause, the WORM retention period would end up finishing later than the specified duration.
Note
The system time does not affect the WORM clock. Changing the system time will not lengthen or shorten the retention period.
Example
- A WORM shared folder is created with the retention period set to 3 days (72 hours).
- A file is added to the WORM shared folder on Monday 18:00.
- If there are no events that cause the WORM clock to pause, the WORM retention period for the file would be expected to end after 72 hours on Thursday 18:00.
- The NAS shuts down on Tuesday 01:00.
- The NAS starts up on Tuesday 06:00.
- The WORM clock resumes.
- The last 5 hours are not counted as part of the WORM retention period for the file.
- No further events cause the WORM clock to pause.
- The WORM retention period for the file ends on Thursday 23:00.
- The file can now be modified or deleted.
- The end time is 77 hours after Monday 18:00 when the file was added to the WORM shared folder.
- The 77 hours include:
- 72 hours that the WORM clock counted when the NAS was running
- 5 hours that the WORM clock paused when the NAS was shut down
WORM Limitations
- WORM can only be enabled during shared folder creation.
- WORM cannot be enabled or disabled after shared folder creation.
- WORM settings cannot be modified after shared folder creation, except for the following:
- The WORM retention period can only be modified after shared folder creation if the WORM type is set to "Enterprise".
- When cloning from a snapshot of a WORM shared folder, WORM will be disabled in the new shared folder.
The WORM settings of the original shared folder are not cloned to the new shared folder.
Further Reading
適用產品
QuTS hero , QES
背景
WORM（一次寫入多次讀取）技術確保資料一旦寫入，其狀態保持不變。資料不能被刪除或修改，有效地鎖定資料狀態。WORM主要用於長期資料儲存或合規應用，以及防止勒索軟體加密的網路安全保護。
您可以配置的WORM設定之一是WORM保留期。此期間決定WORM適用於WORM共享資料夾中的檔案和資料夾的時間長度。
詳細資訊
WORM保留期不是基於系統時間，而是基於包含WORM共享文件夾的儲存空間池的運行時間。
每個儲存空間池都有自己的WORM時鐘，決定WORM保留期何時結束。以下情況可能會暫停WORM時鐘：
- 關閉系統
- 重新啟動系統
- 卸載儲存空間池
- 卸載儲存空間池中的磁碟
- 卸載包含儲存空間池的機箱
- 如果池是SED安全儲存空間池，則鎖定儲存空間池
- 更新NAS韌體
- 當儲存空間池的RAID組中的異常磁碟數量超過RAID組的磁碟故障容限時
當發生上述任何事件時，WORM時鐘會自動暫停。WORM時鐘僅在中斷事件結束或恢復正常狀態時才會繼續。然而，由於暫停，WORM保留期將比指定的持續時間結束得更晚。
注意
系統時間不會影響WORM時鐘。更改系統時間不會延長或縮短保留期。
示例
- 建立一個WORM共享資料夾，保留期設定為3天（72小時）。
- 在星期一18:00將檔案新增到WORM共享資料夾中。
- 如果沒有導致WORM時鐘暫停的事件，該檔案的WORM保留期預計在72小時後的星期四18:00結束。
- NAS 於星期二 01:00 關閉。
- NAS 於星期二 06:00 啟動。
- WORM 時鐘繼續。
- 最後 5 小時不計入檔案的 WORM 保留期。
- 沒有其他事件會導致 WORM 時鐘暫停。
- 檔案的 WORM 保留期於星期四 23:00 結束。
- 現在可以修改或刪除檔案。
- 結束時間是檔案新增到 WORM 共享資料夾後的星期一 18:00 的 77 小時。
- 這 77 小時包括：
- NAS 執行時 WORM 時鐘計算的 72 小時
- NAS 關閉時 WORM 時鐘暫停的 5 小時
WORM 限制
- WORM 只能在建立共享資料夾時啟用。
- 共享資料夾建立後不能啟用或禁用 WORM。
- 共享資料夾建立後不能修改 WORM 設定，除了以下情況：
- 如果 WORM 型別設定為“企業”，則只能在共享資料夾建立後修改 WORM 保留期。
- 從 WORM 共享文件夾的快照克隆時，WORM 將在新共享文件夾中禁用。
原始共享資料夾的 WORM 設定不會克隆到新共享資料夾。
進一步閱讀
