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Forum Discussion
RR4360X - RAID 60 volume size incorrect
I have a ReadyNAS RR4360X. It had 36 x 12 TB Seagate ST12000NE007 drives installed (10.9 TB actual space) Running RAID 60 with 3 Raid Sets, volume showed data 265 TB I then added 9 x 12 TB Seagate ...
pmcwilliam wrote:
I was hoping Netgear would do incident support, but I guess I wll purchase a new contract to see if they can assist
You could ask about per-incident support when you contact them.
Of course starting from scratch is possible, but hopefully isn't needed (given the size of the array).
BTW, my thinking here is that the RAID array itself is the proper size, but that the BTRFS file system somehow wasn't expanded to fill the full array.
Also, I've looked again at your numbers.
You are saying that your volume size is actually 279 TiB (300 TB). You are also saying that you started with 36x12 TB RAID60 (also using three RAID groups).
Three RAID6 groups results in 6 disks used for redundancy, so the volume size with 36x12TB should have been 360 TB (326 TiB). So even before expanding to 45x12TB the file system was too small.
However, 36x10TB would have yielded a 300 TB (279 TiB) volume. Is it possible that the array originally was 36x10TB, and then expanded to 36x12TB? If so, it looks like that first expansion didn't complete correctly.
StephenB,
I agree that the RAID array is the correct size but the expansion did not occur at the file system
I started with 36 x 12 TB drive, RAID 60 in 3 RAID groups. 2 RAID groups had 15 drives and the 3rd had 6 drives
The drives are Seagate 12TB IronWolf, which report to the system as 10.9 TB
Using an online RAID Calculator, the above numbers should get me 327 TB
However, I think I only got about 280 TB, which would account for 30 drives in 2 RAID sets
Then I added 9 more drives to the 3rd RAID set which should get me 425 TB
As we see from the first screen shot there is 428 TB of space available but only 297 TB is allocated to the data volume
Further issue, one of the iSCSI LUN's is now showing as RAW on the Windows server, so it appears I have lost part of my backups already
Will be trying to call NetGear this morning to see about incident support
Thanks for your help and suggestions
pmcwilliam wrote:
StephenB,
I agree that the RAID array is the correct size but the expansion did not occur at the file system
I started with 36 x 12 TB drive, RAID 60 in 3 RAID groups. 2 RAID groups had 15 drives and the 3rd had 6 drives
FWIW, you don't really need to use the RAID calculator. 2 disks in each group are for redundancy, so you can get the full size in TB by subtracting those out from the total. The OS partition on each disk (4 GB) is in the noise. The system reports drive size in TiB, and you can easily convert TB to TiB in google. For instance, enter "300 TB in TiB".
But I am a bit confused on your starting configuration which used unequal sized RAID groups. I don't think you can use RAID-0 to stripe across unequal groups (though you should be able to concatenate them, but that isn't actually RAID60). That might actually be part of the problem.
I know I don't need to use the calculator, just always have (force of habit)
I have never used RAID 60 before this unit, and I did not understand that it would auto configure everything in RAID 60
In hindsight I should have stopped and removed the 6 drives from RAID set 3 and started over until I could add the additional 9 drives, but I did not
I have purchased a support contract and Netgear is working on it now, they agree something is not right
Hopefully they can fix it without having to start from scratch, I don't really want to lose all my backup data and start over
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