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Brand New ReadyNas 204 2 x 3TB drives only show as 2.72TB

nicksmith10
Aspirant

Brand New ReadyNas 204 2 x 3TB drives only show as 2.72TB

Hi all,

 

Sorry for the possible noob question here but I am completely new to NAS.


Just decided to invest in a new NAS 204 and bought 2 x 3TB WD Red drives to install from out of the box.

 

Went through full install (8 hrs) but unsure why they only show as 2.72TB ?  Here is a screen grab from the home page.

 

Apologies if this is something straight forward...

 

Cheers,

 

 

Nicknas.jpg

Message 1 of 5
mdgm-ntgr
NETGEAR Employee Retired

Re: Brand New ReadyNas 204 2 x 3TB drives only show as 2.72TB

With X-RAID the volume is redundant (you have two disks, so you have RAID-1, where the volume can withstand the failure of one of the disks). If you add one more 3TB disk your volume capacity will double and you will have RAID-5.

Disk manufacturers measure 1KB=1000 Bytes whereas like most computers we use 1KiB=1000 Bytes, and also like most computers we leave out the i when writing it.

So (2-1) * 3 * 1000^4 / 1024^4 gets you roughly 2.72TB. There are of course overheads, and there is the 4GB OS partition as well as the swap partition which use up a little space on the disks.

 

Please note that whichever RAID level you choose backups are still important. No important data should be stored on just the one device.

Message 2 of 5
nicksmith10
Aspirant

Re: Brand New ReadyNas 204 2 x 3TB drives only show as 2.72TB

Thanks mdgm,

 

Just did some research on RAID which helped a lot, that makes complete sense now !!

 

If one of my disks fails then the data is still safe because of the other one...

 

I didn't even think about that !!


That's awesome if I need more I will add another 3TB at a later date, thanks for your help.

 

Although could I add a 4TB ? or are they all supposed to be the same ?

 

Nick

Message 3 of 5
mdgm-ntgr
NETGEAR Employee Retired

Re: Brand New ReadyNas 204 2 x 3TB drives only show as 2.72TB

Yes you can add a 4TB disk but note it will only use 3TB of that disk till you add a second 4TB disk.


Do note that there are other problems than disk failure that can happen so backups e.g. to a USB disk, another NAS are important. Do not store important data on just the one device.

Message 4 of 5
JennC
NETGEAR Employee Retired

Re: Brand New ReadyNas 204 2 x 3TB drives only show as 2.72TB

Hello nicksmith10,

 

This may also help calculating the approximate volume size you get from combined disks in a RAID (XRAID and Traditional/FlexRAID): http://rdconfigurator.netgear.com/raid/index.html

 

OS partition, swap partition, etc are not deducted yet.

 

Regards,

Message 5 of 5
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