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Forum Discussion
Cannot copy files to RN316 although I have 22TB free...
Hi all. I have the following RN316: Firmware 6.10.4 Running 6 x 10TB IronWolf HDDs X-RAID 21.9TB free / 23.4TB used History: Last year I replaced all the 8TB Ironwold HDDs (from memory) one by...
Firstly, thanks a million as always.
Of course I don't know, but I would be surprised if snapshots are the root cause....
I only have set up snapshots for my OneDrive and Dropbox shares. Which represent a fraction of the photos and movies that are stored on the RN316.
Any other snapshots, which likewise were not large anyway, are now gone. So because I only used the free versions of these services that are limited in size. Dropbox = 16GB, OneDrive I can't remember, but probably around 16GB as well. So I thought I would use the snapshot feature of the RN316 for these shares as the free tiers of OneDrive and Dropbox do not have this functionality.
Do you really think it will make a difference if I remove these underlying snapshots? They are small no? But perhaps they take up a lot of meta data???? I don't know...
OneDrive share UI says:
- 7149 files, 98 folders, 13GB
- 20 snapshots (2year(s) protection)
DropBox share UI says:
- 15365 files, 571 folders, 13.9GB
- 19 snapshots (2year(s) protection)
I too have concluded/decided that I will at some point, as soon as I can, buy 8 x 16TB HDDs for my new DS1819+, and do as you suggest with moving all the data off the RN316, refomatting it and movingit back. But I cannot afford the 8 x 16TB HDDs right now, in one hit.
So the frustrating thing is I have run out of space on all my ReadyNASes. I have this 20TB free but I cannot use it!!!! ArggghHh.... :)
So would you suggest an action plan of trying to removing 1TB of old data from md127, then doing a balance, then doing a defrag, then doing a balance and then trying to copy the data back????????
Of course I am very curious as to what the problem is and how to avoid it in the future. It sounds to me that using a strategy of going from (6 x 4TB HDDs) to (6 x 10TB HDDs) to (6 x 16TB HDDs) in the future is not a viable solution for this BTRFS based RAID NASes.
Unless of course I should have had monthly balances/defrags, Which I never did. Netgear never recommended it. I had assumed (incorrectly it seems) that you never needed to run these operatiosn as I only predominanlty only add my family photos and videos.
So I want to learn the lesson here, but am struggling to learn what I did wrong and how to avoid this in the future, other than your "brute force" technique.
So I was planning to fill out my new DS1819+
- Buy 1 x 16TB HDDs in the first month (Yes I know there is no RAID)
- Add 1 x 16TB HDD every month after that, so as to stagger the HDDs lifetime, reduced the chance of them all failing simultaneously, and also staggering the cost
But given all the dramas I am having with BTRFS, I wondering whether this is a horrendous idea, and I would be better off buying 8 x 16TB HDDs and setting up one massive pool. So take the hit on the wallet! :(
Or can I get away with perhaps buying 4 x 16TB HDDs and set up one pool this year. And in 12-24 months buying 4 x 16TB HDDs and set up another pool?
I am begining to suspect that buy the 8 x 16TB HDDs in one hit in the best way to go... Ouch!
Platypus69 wrote:
So would you suggest an action plan of trying to removing 1TB of old data from md127, then doing a balance, then doing a defrag, then doing a balance and then trying to copy the data back????????
Well, we can't see what is actually on md127 (as opposed to md126). But you could try copying off some older shares, and then delete them. After the space is reclaimed (hopefully from md127), you can try a balance (which should succeed if there's enough space on md127). A scrub might also reallocate some space. After that, you could recreate the shares and copy the data back.
A defrag won't help - and it can reduce free space in the shares that have snapshots enabled.
Platypus69 wrote:
Unless of course I should have had monthly balances/defrags, Which I never did. Netgear never recommended it. I had assumed (incorrectly it seems) that you never needed to run these operatiosn as I only predominanlty only add my family photos and videos.
So I want to learn the lesson here, but am struggling to learn what I did wrong and how to avoid this in the future
They don't offer any guidance on volume maintenance. My current practice is to schedule each of the four tasks (scrub, disk test, balance, and defrag). I cycle through one each month, so over a year each runs 3 times. Defrag probably isn't necessary - but I have enough free space to avoid the downside, so I just run it anyway.
Opinions here differ on balance - mdgm for instance only runs it rarely (if at all). But I have seen posts here where it has reclaimed unallocated space. In general, if a balance isn't needed then it runs very quickly and I've never had any problems running them. So I continue to run them on this schedule.
I don't know how your system ended up this way. FWIW I also have multiple RAID groups on my NAS.
Label: '2fe72582:data' uuid: a665beff-2a06-4b88-b538-f9fa4fb2dfef Total devices 2 FS bytes used 13.54TiB devid 1 size 16.36TiB used 12.72TiB path /dev/md127 devid 2 size 10.91TiB used 1.27TiB path /dev/md126
Unallocated space isn't evenly split across the two RAID groups, but fortunately I do have reasonable space on the original md127 RAID group.
It seems to me that btrfs balance should handle this better - not sure if there are options that would spread the unallocated space more evenly. I'll try to research it if I can find the time.
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