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RAID 6
Dear All, We bought new NAS316 with 6TB HDD X 4 and I have configured intial settings, but when i look at volumes it by default it is configured to RAID 5 but I want RAID 6 to be configured. ...
That's the expected capacity for RAID-5. With RAID-5 you'd subtract the capacity of one disk for redundancy so 5x4TB = 20TB, but like most PCs we use TiB (base 2) not TB (base 10). So 20TB = 20/1024^4*1000^4 = 18.19 TiB which rounded down to the nearest TiB is 18TiB. Like PCs tend to we refer to TiB as TB. A bit confusing that we use base 2 whereas disk manufacturers use base 10 but it's still the same amount of space. Allowing for overheads 18TB is what you'd expect using RAID-5.
To change to using RAID-6:
1. Go to System > Volumes2. Disable X-RAID (click on X-RAID button and confirm you wish to disable it)
3. Destroy the default volume (note this wipes all the data, so be sure to backup your data first).
4. Create a volume called 'data' (no quotes) using all disks in RAID-65. Re-enable X-RAID.
mdstat.log is telling you this. you can download the logs by going to the admin webpage. use system/logs and click on the download button. this will generate a zip-file on the harddisk of your workstation. mdstat.log is part of that.
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