We found that some newbies always ask strange questions about RAID;
Please note: # NASPi-Gemini 2.5 is a hardware RAID. It supports RAID at the hardware level and does not require any software configuration. This has nothing to do with software.# Although NASPi-Gemini 2.5 also supports hardware RAID, BUT we recommend that you use '''software RAID''', even if which will bring a certain degree of ease of maintenance later on. Software RAID comes from the NAS software you use, such as OMV does not support RAID settings;
==Features==
* Compatible with all Raspberry Pi operating systems <span style="color:red;">(If the OS (such as Home Assistant) does not allow the installation of external scripts, then the software safe shutdown and automatic adjust fan speed functions are not supported;)</span>
==How to Power NASPi Gemini 2.5==
<span class="tb_red ">Warning about power supply:</span>
# Don't use that adjustable voltage power supply.
===for X882 V2.0===
* Power via DC5521 Jack of X882 V2.0, <span style="color:red;">6-18Vdc +/-5% , ≥4A</span>,
* Refer to the following diagram:
[[File:X882-V2.0-How_to_Power1.jpg|700px|How to Power NASPi Gemini V2.0]]
===Some tutorials===
*[[How to View/Partition/Format/Mount HDD/SSD]]
*[https://raspberrytips.com/format-mount-usb-drive/ How to Format and Mount a USB drive on Raspberry Pi]
* How to How to migrate Raspberry Pi SD card to a USB SSD: https://www.youtube.com/watch?v=AenM-JrG098
* [https://www.jmicron.com/file/download/1033/JMS561_Product+Brief.pdf Chip Document]
A: If there is HDD error, there will be red led for the red marked part LED. [[File:Hdd.png|thumb|none|HDD error]]
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<summary>Q1: Why only one SSD/HDD is recognized?</summary>
A: You found only SSD/HDD if you select the RAID0/RAID1 mode.
Please '''exit the RAID mode''' and check again after '''entering the PM mode(clear raid mode)'''.
More details please refer to '''Set CLEAR RAID mode''' of [[NASPi_Gemini_2.5#How_to_configure_RAID|How to configure RAID]]
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<summary>Q2: What to do if HDD/SSD is not recognized?</summary>
A: Please refer to [[How to View/Partition/Format/Mount HDD/SSD]]
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<summary>Q3: What is the thickness of a 2.5" HDD/SSD that can be accommodated for NASPi Gemini 2.5?</summary>
A: NASPi Gemini 2.5 support Max <span style="color:red;">16mm</span> thickness 2.5" HDD/SSD; The thickness of 2.5" HDD/SSD on the market is generally 7mm, 9.5mm, 12.5 and 15mm，so you can choose the SSD/HDD according to your requirement.
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<summary>Q4: Does raid inside of openmediavault function with NASPi-Gemini 2.5?</summary>
A: NASPi-Gemini 2.5 support hardware RAID mode, please refer to above Raid_Setting, or you can set it to PM mode then let openmediavault control RAID setting.
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<summary>Q5: What are the HDDs requirement when use RAID mode?</summary>
A: Strongly recommend to use the same brand and capacity HDDs when use RAID Mode.
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<summary>Q6: What to do if meet I/O error?</summary>
AQ9: First please check if you use the USB Type-C power adapter, if yes, please change to use DC power adapter topower via DC jack of X882 to testRAID issue with OMV. The USB Type-C PSU maybe not enough to power the dual HDD/SSD.</details>
<details>A: The RAID mode is not tested with OMV OS. The OMV also supports software RAID, you can set the X882 to PM mode and test the software RAID of OMV.<summary>Q7: Why only one SSD/HHD If you want to test the hardware RAID of X882, it can be recognized?</summary>connectted to WINDOWS PC for testing.
AQ10: You choose the RAID1 mode, because it is How to replace a hardware RAID, so OS recognize only one bad HDD/SDD.</details>?
<details><summary>Q8: How to know if First of all, it depends on whether you use '''software RAID''' or '''hardware RAID'''. If you use software RAID, there will be corresponding functional modules in the NAS software to assist you in replacing the hard drive. After the HDD errors?</summary>replacement is completed, the NAS software will automatically synchronize the data to the new hard drive.
AIf you use '''hardware RAID''', you can refer to the following steps:# '''Confirm the faulty hard disk''': If there is the HHD1 or HDD2 LED lights up red, it means that the HDD feedback S.M.A.R.T read error, there will be red led for it is recommended to replace it # '''Back up important data''': It is recommended to connect to a Windows computer and back up important files directly through COPY. # '''Purchase a new hard drive''': To ensure compatibility and performance consistency, it is recommended to purchase a hard drive of the same model and capacity as the red marked part LEDoriginal hard drive. [[File# '''Shut down the NAS system''': to avoid data corruption or other unexpected situations during the replacement process # '''Start the NAS system''':HddAfter startup, the RAID controller will automatically detect the new hard drive and start the data synchronization and reconstruction process.png|thumb|none|HDD error]]This process may take some time, depending on the size of the </details>hard drive and the load on the system.
</html>PS: Although GEMINI also supports hardware RAID, we recommend that you use software RAID, which will bring certain convenience to later maintenance. The function of software RAID comes from the NAS software you use such as OMV.