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Aspirant

May 29, 2018

Solved

11TB (2TB + 2TB + 3TB + 4TB) results in 7.24TB in RAID0??? where does the space go?

Hi,

I just installed a new 4TB disk into my ReadNAS RN104 which already contained a 2 x 2TB + 3TB. When I check the net disk capacity it's 2 x 1.8, 2.4 and the new disk 3.6, total 9,9TB. But if I create a RAID0 spanning all 4 disks, I get a mere 7,26TB. So where have the oter 2,7 GB gone?

Just as quick comparison. I also have Synology DS418, containing 3 x 3TB (so 9TB) which yields in 8.2 TB Volume size in RAID0. On the ReadyNAS with 11 TB I get 7,26? What is ReadNAS doing here? Is there any way to increase the size? I pulling my hair out where all this space gets lost on the RN104.

Cheers

Marc

Adding Disks

Installation & Upgrade

StephenB
May 30, 2018
marcelser wrote:

I played around more with the ReadyNAS calculator more and it turns out that mixed disks in RAID0 mode is not handled by any ReadyNAS in a useful way.

I believe that with the 6.9.3 you can manually create RAID groups using the extra space on the larger disks, and then concatenate them to the existing volume. Though it's not as automated as it might be, you should still be able to do it.

The guide here might help - https://www.netgear.com/images/support/WP_ReadyNAS%20FlexRAID%20Optimization%20Guide_18May17.pdf

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StephenB
Guru - Experienced User
May 29, 2018
What firmware are you running?

Can you tell us more precisely what steps you took? For example, did you

insert the 4 TB disk

delete the existing volume

create a new RAID-0 volume that spanned all disks

Or did you do something else?
- marcelser
  Aspirant
  May 29, 2018
  I'm Running OS Version 6.9.3
  As for the steps I tried 2 different attempts.
  1) put in new disk, deleted volume, formatted disks (getting an error on the disk where the os was installed that it cannot be formatted). Then created single RAID0 volume spanning all disks which created 7.26TB volume.
  
  2) I installed just the new 4TB disk started it which caused a firmware reset and os install on the new disk. After initial boot was complete I shutted down, put the other 3 disks back in and powered on. Then completed setup wizard, switched from x-raid to Flex-raid, deleted the initial volume the setup wizard created, formatted the old 3 disks and again created raid0 volume spanning all disks still ending up with a volume size of 7.26TB.
  
  Any ideas?
  - mdgm-ntgr
    NETGEAR Employee Retired
    May 29, 2018
    Can you send in your logs (see the Sending Logs link in my sig)?
    
    Why not just use X-RAID?
    
    If you're after the performance benefits of a spanned RAID-0 volume I would have suggested getting a more powerful ReadyNAS.
    
    With a spanned RAID-0 volume if a single disk fails all data is lost.