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X-RAID expansion

Jakuki
Aspirant

X-RAID expansion

Hi everyone, looking for some guidance here. I have a RN214 with two 4TB HDD configured at RAID1 right now. I still have around 3TB of space left on the HDD but know that I'll eventually use up the 4TB. 

 

My NAS is currently running X-RAID so my understanding is that if i put in more 4TB drives, it will automatically reconfigure to RAID5 (please correct me if this is not true). My question is, can I actually wait until the current 4TB is used up before buying/installing more HDDs for expansion? My concern is that if I fill the 4TB and turns out I have to reformat ALL the drives when I expand, I'll need to somehow find a way to store the current 4TB of data off the NAS, then somehow put the files back onto the reformatted drives. 

 

Is there any advantage for me to get two extra 4TB drives now? Or I should just wait as memory should get cheaper overtime?

 

Thanks for all the help. 

Model: RN21400|ReadyNAS 214 Series 4- Bay (Diskless)
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StephenB
Guru

Re: X-RAID expansion


@Jakuki wrote:

I'll need to somehow find a way to store the current 4TB of data off the NAS, then somehow put the files back onto the reformatted drives.


First, I want to point out that RAID isn't enough to keep your data safe.  There are lots of posts from folks here who assumed otherwise, and ended up either losing data, or coming very close to it.  

 

So I do strongly recommend that you invest in a backup plan for your NAS.  USB drives are one affordable method that many people use.

 

FWIW, Netgear recommends ensuring you have an up-to-date backup before expansion - personally I recommend that you always have a backup (mine are daily).

 


@Jakuki wrote:

My question is, can I actually wait until the current 4TB is used up before buying/installing more HDDs for expansion?


I don't see any need to expand now, given that you are only using 25% of your capacity.  One reason to wait is that your storage needs might change.

 

But don't wait until the volume is completely full.  I'd expand when the volume reaches about 80-85%.  The BTRFS file system doesn't behave well when it gets completely full. 

 

If you expand with 4 TB drives, you only need to add one more btw.  If you expand using larger drives, you'd need to install two to get the full capacity.  (Note you can't add drives smaller than 4 TB).

 

I recommend CMR NAS-purposed drives (WD Red Plus, Ironwolf) for your NAS - though of course enterprise class would also be fine.  I'd avoid WD Red (as they are SMR), and desktop drives (as many are also SMR).

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