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Missing Storage Readynas 516
I am running my 516 nas with 6 x 4TB hard drives = 24TB in XRAID RAID 5
My NAS tells me i have 10.11TB Free Space Used Data 4.33TB i thought 24TB's in Raid 5 would give me 20TB space
I started of with 2 drives then added two more some months later then realised the WD Red Pro i was using was at end of life wanted all to be the same so as i could source them added them one at a time
All the drives in place show and are working properly each shows a blue light confirming this am i wrong here is this correct
After a Resync the volume has now expanded showing correct size 18.07TB instead of 14.43
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If a disk is labeled as 4TB, it only has roughly 3.6 TiB. (read wikipedia here for the difference https://en.wikipedia.org/wiki/Tebibyte). And the nas shows you the lower on its admin webpage
Furthermore running your system in raid5 you are "loosing" 1 complete disk to have redundancy insurance. If one disk breaks you would be able to replace it without loosing everything.
So, your 6x4TB disks in raid5 gets us 5x3.6TiB, which is roughly 18 TiB diskspace overall for your system configuration.
As you are reporting only 14.5TiB in your system overall, there might be the problem, that not all disks are recognized to their full capacity.
You could do the following to find out what capacity the nas recognizes for each of your disks. On the admin webpage go to System/Volumes and hover your mouse for a few seconds over each of the blocks representing a disk. In the 7th row of each displayed text-box you will the see capacity for the concerned disk. Under normal circumstances I would expect for all 6 something like 3.6.
Hi yes in have checked all 6 are showing 3.6TB
After downloading the logfiles you might want to check btrfs.log to see how the partitions are truely layed out and you will see something like this
Label: 'xxx:data' uuid: yyy
Total devices 2 FS bytes used 7.59TiB
devid 1 size 5.44TiB used 3.70TiB path /dev/md127
devid 2 size 10.92TiB used 3.91TiB path /dev/md126I have 4x6TB RN204, which in raid5 finally results into a volume of roughly 16.5TiB. Which is exactly that, what one would expect in this case.
How do i download the logfiles
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pgjscottieuk wrote:
How do i download the logfiles
There's a download control on the log page in the web ui. That will download the full log zipfile.
Your volume appears to be 4 TB short. There are three possibilities.
- You could be running dual redundancy
- The btrfs volume might not have expanded when the last disk was added (even if all disks are in the RAID array).
- One disk might not be part of the active RAID array (despite the status shown in your screenshot)..
In the last case, one of the disks might be marked as a "spare" in the logs. Try looking through btrfs.log, mdstat.log and volume.log.
- Please download the logs and paste the content of mdstat.log so i can double check. But 6x2TB in RAID5 showing 8.15TB of capacity seems correct.
You need to remove the capacity of one disk because of the RAID5, then count the difference between Terabytes and Tebibytes (wikipedia), then count that 4.5GB on each disk is used by the system, finally consider the filesystem overhead.As requested....
rdcalculator indicates 9.06TiB
Thanks for the help.
Personalities : [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] md126 : active raid5 sda4[0] sde4[5](S) sdf4[6] sdd4[4] sdc4[2] sdb4[3] 3906491648 blocks super 1.2 level 5, 64k chunk, algorithm 2 [5/5] [UUUUU] md127 : active raid5 sda3[0] sdf3[9] sde3[8] sdd3[7] sdc3[2] sdb3[6] 4859553920 blocks super 1.2 level 5, 64k chunk, algorithm 2 [6/6] [UUUUUU] md1 : active raid6 sda2[0] sdf2[5] sde2[4] sdd2[3] sdc2[2] sdb2[1] 2093056 blocks super 1.2 level 6, 512k chunk, algorithm 2 [6/6] [UUUUUU] md0 : active raid1 sda1[0] sdf1[9] sde1[8] sdd1[7] sdc1[2] sdb1[6] 4190208 blocks super 1.2 [6/6] [UUUUUU] unused devices: <none>
- There is an issue with sde4, it's marked as spare and md126 is on 5 devices instead of 6.
OK. I presume sde is Disk 5... I'll replace the disk and see if it resyncs to full capacity.
No no, the issue is not with the hard drive. It's not a physical issue. Sde4 is "just" a partition, that is a RAID member. You have to fix the RAID.
I'd grow md126 to 6 devices, and remove / add sde4 if necessary (using mdadm).
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