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RN516 can no longer save to or access iSCSI
Good morning. My Nas started playing up a few days ago, looking to the community for help. Currently the NAS is 80% full but still has 2.5Tb free space. (6x 3Tb drives in Raid 5) There's a t...
The space on the data volume is fully allocated. Please backup your data then run a balance.
The space on the data volume is fully allocated. Please backup your data then run a balance.
Is the backup precautionary? Just unless I buy a new NAS I've nowhere to store that much data.
How do I do a balance? Not something I've seen before, what does it do?
When you say the space on the data volume is fully allocated, is that in an area I can't see on the web gui because it's showing 2.7tb free space now.
edit: Balancing isn't supposed to wipe data it seems so I guess it's precutionary to take a backup.
Balancing seems to be something to do with data/metadata I assume one of those is full and balancing will resolve it.
found this that explains balancing for me..
ListerOsmeg wrote:
I've nowhere to store that much data.
Doesn't that scare you? Any single device (or RAID array) can fail.
No because all the data on the drive is backups and not my only backup at that. I'd rather you refrain from posting here unless it's a constructive contribution to the issue please and don't up your post count on my thread. Thanks.
ListerOsmeg wrote:
No because all the data on the drive is backups and not my only backup at that.
That's fine then. So you could live w/o the data if something went wrong. I believe the backup is precautionary.
But if you do have files that are simply duplicated somehere else you could delete them before running the balance. It might improve the odds of success (and reduce the balance running time).
ListerOsmeg wrote:
How do I do a balance? Not something I've seen before, what does it do?
If you click on the volume settings wheel, you will see several maintanence functions - including balance. You can run it on demand, or you can schedule it.
There is more info on what the balance does here: https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-balance
Though one aspect which isn't clearly stated there - the balance does run all the files and metadata through the BTRFS allocator. That often does re-consolidate btrfs chunks, (and free up unused allocated blocks) which uses the storage more efficiently.
The running time can be very long (generally the longer it takes the more it is needed). If you have ssh enabled you can run it from the command line (and also pause/resume it from there). Your system will run slower while the balance is running.
ListerOsmeg wrote:
When you say the space on the data volume is fully allocated, is that in an area I can't see on the web gui because it's showing 2.7tb free space now.
Not all the BTRFS info shows up there (it would be good if it were reported). BTRFS space can be used, allocated, or unallocated. There is a description here you might find useful: http://ram.kossboss.com/btrfs-fi-df-balance-btrfs-df-and-freespace-req/
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