RN102 Increase HDD

Question

I have a RN102 with 2 x 2 TB HDD's configured as RAID1. I want to replace the disks with 2 x 4 TB HDD's (without losing data)

Am I correct that the following :

replace one 2TB disk with a new 4TB
wait until Rebuild is finished
replace the second 2TB disk with a new 4TB
wait until Rebuild is finished

will give me the 2TB RAID1 resized to 4TB (with the data) ?

Is it important which disk is replaced first ?

Did I miss something ? Is this how to proceed ?

Thank you

Sandshark · Answer

That is the correct procedure.&nbsp; It does not matter which drive you replace first.&nbsp; Be aware that the sync after the second drive will be in two stages, one to re-sync the original partitions and another to expand.&nbsp; Only when the second step completes will you see more space.&nbsp;And if you have not yet selected drives, I suggest you do your homework.&nbsp; The Netgear compatibility list is so old it's useless.&nbsp; But many drives today, including the WD Red (but not Red Plus or Red Pro) are SMR, which can be very problematic in a RAID system, especially with BTRFS.&nbsp; You want CMR.&nbsp; The Seagate Ironwolf drives are also CMR, as are enterprise class drives not labeled "archive".

Darwin4Ever · Answer

Hi, thank you for the reply.&nbsp;I'm aware of WD RED being SMR now. WD should never having used the name WD RED for the SMR-disks. Created (and creates) a lot of confusion and source of problems for people not knowing the change.&nbsp;But the two 4TB disks I have are WD RED Plus, so CMR.&nbsp;So I was correct with the procedure, I assume all can been done hot-swap ?&nbsp;Thanks&nbsp;&nbsp;

StephenB · Answer

Darwin4Ever&nbsp;wrote:
So I was correct with the procedure, I assume all can been done hot-swap ?
&nbsp;

Correct.
&nbsp;
Netgear does recommend doing a backup first, as if one of the existing disks fails during the resync you can lose data.

Darwin4Ever · Answer

The actual configuration being a 2TB RAID1, there are actually two Healthy copies which makes me think I can proceed without backup ? If something goes wrong with the first HDD, I still have the second one.

StephenB · Answer

Darwin4Ever&nbsp;wrote:
The actual configuration being a 2TB RAID1, there are actually two Healthy copies which makes me think I can proceed without backup ? If something goes wrong with the first HDD, I still have the second one.

Keeping the 2 TB drives intact until the procedure completes does give you reasonable fallbacks if something goes wrong.

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RN102 Increase HDD

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