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Which NVME was parity, which was data?

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Hey,

after a sudden USB stick death i replaced the stick, moved the licence and now i'm not sure which of the NVMEs was the data and which was the parity drive.
Both are from the same manufacturer, both have the same size, i have no screenshot from the working state.

How do i safely find out, which drive was data and which was parity?

  • Community Expert

Wierd setup you have... anyway...

just install "unassigned devices" plugin and it will show you both NVMes

One of them will be mountable, the other seems to have no valid filesystem

This will be the former parity drive.

(still dont understand why someone uses two nvme drives within an unraid array (no TRIM support!!!) and uses one as data the other for parity. The more common approach would be to create a mirrored zfs pool, but again.. it is your choice.)

  • Community Expert

If you have the special case of only 2 drives in the array (1 data + 1 parity) then they will be mirrors of each other so it does not matter. In the more general case of 1 parity and multiple data drives then the parity drive will be the one with no mountable file system.

  • Community Expert
10 hours ago, Gekko said:

Hey,

after a sudden USB stick death i replaced the stick, moved the licence and now i'm not sure which of the NVMEs was the data and which was the parity drive.
Both are from the same manufacturer, both have the same size, i have no screenshot from the working state.

How do i safely find out, which drive was data and which was parity?

Can you post diagnostics? this may include relevant information

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