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Why My ReadyNAS PRO is 1T less than the Raid Calulator
Hi everyone,
I did use the Netgear Xraid calculator configured my raid setup, three 4TB drives, one 2TB plus two 1TB drives in X-RAID .
refer to Calculator I should get 10.9TB in total. but my real capacity only 9.98TB. is there anything I did wrong?
also, please advice me what percentage of the drive I should leave for snapshot and normal operating?
My device is ReadyNAS Pro 6, on Firmware6.9.3
Thank you for your help.
Hi 7lkf7
You can perform factory reset if you want but make sure you have backed up all your data. You may want to wait for StephenB 's advise once the log has been checked.
Doing factory reset removes all data so make sure everything has been copied or updated. I'm pretty sure what the calculator is showing will be the same with your volume after the factory reset.
Regards
8 Replies
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Hi 7lkf7
Welcome to the Community!
Did you had this setup when you factory defaulted the unit or was this an expansion?
- This tool is not a volume space simulator, so it will not calculate expansions. This tool assumes a factory defaulted state for each drive configuration.
So if it's an expansion there is a possibility that the calculation is different since the RAID calculator assumes that it is an initial setup or factory defaulted setup. There are also things to consider like the File system overhead and Snapshots so the RAID calculator is actually giving you an estimate of the RAID that will be configured.
We always recommend that the volume capacity to always have 20% free disk capacity to avoid performance issues.
You can allocate Snapshot space depending on what you need, You can always manage your Snapshots by properly configuring it according to your preference. You can also use Smart Snapshot to help you maintain your disk capacity.
You can also do volume maintenance to manage your volume and make sure everything is balanced and properly allocated.
Hope this helps!
Regards
Hi Marc
Thank you for your reply, I did use an expansion instead of Factory reset. as I was a bit lazy to copy all the data out from my original setup.
My original setup was 3 1TB drive. so what I did is 1, put out 1TB and replaced by new 4TB and wait for sync. and did another one, and another one. after I replaced 3 old drive. I installed one 2 TB and sync, and 2 more 1TB.
Am I did this in a correct way?
Thank s
7lkf7 wrote:
My original setup was 3 1TB drive. so what I did is 1, put out 1TB and replaced by new 4TB and wait for sync. and did another one, and another one. after I replaced 3 old drive. I installed one 2 TB and sync, and 2 more 1TB.
Once you upgraded two drives to 4 TB, you aren't supposed to install smaller drives than 4 TB. There already was a 1 TB RAID group because you started with 3x1TB, so I think that worked out ok with the 1 TB disks. I think what happened is that you ended up using only 1 TB of the 2 TB drive.
Can you post mdstat.log (as I requested earlier).?
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