Hello, I'm having an issue with our ReadyNAS 4312, we're using it as VEEAM target, set up an iSCSI LUN 49TB in size. We had about 5-6TB of space left on the NAS outside of that LUN. We recently tried to turn on snapshots for the iSCSI LUN and I must have chose too high of a retention rate or something. I now have no space left out of that 5-6TB and since the LUN is thick provisioned even though I have space left there I have no way to clear off space or delete these snapshots or half snaps or whatever is happening. I don't have software support on this NAS anymore, I couldn't even contact support. Anyone have any ideas? I'll attach a screenshot of the volume overview, because it doesn't even show me a yellow section for where the snaps are taking up space. I would prefer not to have to delete everything on this target these are our VEEAM backups for a large portion of our environment.

dgaliffa wrote: 12x 6TB drives in RAID 6, I'm lost on how anything could be taking up that remainder 5-6 TB. BTRFS allocates space in chunks (usually 1 GB). I think in your case there is free space within some chunks, but that all the chunks are used (that is, none of them are completely empty). This would happen if the LUN became fragmented over time. Though it's not clear how a thick LUN would have been fragmented. If there are no free chunks in your filesystem, there there isn't much you (or support) can do to fix it. If you can't expand the volume, I guess you could back up the contents of the iSCSI drive from the VEEAM server. Then delete the LUN, recreate it, and then restore the contents from the backup. That would be very time consuming (and of course assumes you have enough storage). If there are some files outside the LUN (at least a few gigabytes), you could try deleting those and see if you end up with any unused or unallocated chunks. Then balances could help (initially run from ssh, with some thresholds set manually). FWIW, there is another command that gives you a somewhat different breakdown # btrfs filesystem usage /data That will give you the amount of unallocated space as well as an estimate of free space (which is a slippery concept with btrfs). Hopefully JohnCM_S or Marc_V will chime in - they might have some other ideas.

you need to login as User root using the nas admin password

I don't have software support on this NAS anymore, I couldn't even contact support. If you (or your company) were the original purchasers, you should be able to purchase a support contract through my.netgear.com. You would need to use the account of the person who registered the NAS (or arrange to get that transfered somehow). JohnCM_S or Marc_V should be able to assist. dgaliffa wrote: I'm having an issue with our ReadyNAS 4312, we're using it as VEEAM target, set up an iSCSI LUN 49TB in size. We had about 5-6TB of space left on the NAS outside of that LUN. We recently tried to turn on snapshots for the iSCSI LUN and I must have chose too high of a retention rate or something. I now have no space left out of that 5-6TB and since the LUN is thick provisioned even though I have space left there I have no way to clear off space or delete these snapshots or half snaps or whatever is happening. What firmware are you running? You could enable ssh, and see any snapshots by entering # btrfs subvolume list /data

If possible I'd like to make adding software support contract to be the last resort that's sort of why I'm on here. The firmware version is 6.10.1 which I recently updated. I will turn on SSH and try to check that.

I attached a screenshot, i was able to get ssh'd in but the command doesn't work

ReadyNAS 4312 - 54TB usable full even though the only thing stored 49TB LUN

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StephenB
Guru - Experienced User
Aug 05, 2019

I don't have software support on this NAS anymore, I couldn't even contact support.

If you (or your company) were the original purchasers, you should be able to purchase a support contract through my.netgear.com. You would need to use the account of the person who registered the NAS (or arrange to get that transfered somehow). JohnCM_S or Marc_V should be able to assist.

dgaliffa wrote:

I'm having an issue with our ReadyNAS 4312, we're using it as VEEAM target, set up an iSCSI LUN 49TB in size. We had about 5-6TB of space left on the NAS outside of that LUN. We recently tried to turn on snapshots for the iSCSI LUN and I must have chose too high of a retention rate or something. I now have no space left out of that 5-6TB and since the LUN is thick provisioned even though I have space left there I have no way to clear off space or delete these snapshots or half snaps or whatever is happening.

What firmware are you running?

You could enable ssh, and see any snapshots by entering

# btrfs subvolume list /data
- dgaliffa
  Aspirant
  Aug 05, 2019
  If possible I'd like to make adding software support contract to be the last resort that's sort of why I'm on here. The firmware version is 6.10.1 which I recently updated. I will turn on SSH and try to check that.
- dgaliffa
  Aspirant
  Aug 05, 2019
  I attached a screenshot, i was able to get ssh'd in but the command doesn't work
  - bedlam1
    Prodigy
    Aug 05, 2019
    you need to login as User root using the nas admin password
- dgaliffa
  Aspirant
  Aug 05, 2019
  Scratch that, I needed to be logged in as root, so I see the veeam repo/.snapshots is that what I'm looking for?
  
  root@MVH-RNAS72:~# btrfs subvolume list /data
  ID 257 gen 8278595 top level 5 path home
  ID 258 gen 8260736 top level 5 path .apps
  ID 259 gen 10 top level 5 path .vault
  ID 260 gen 8261962 top level 5 path ._share
  ID 41223 gen 4952707 top level 5 path .purge
  ID 82186 gen 8281815 top level 5 path Veeam-Repo-01
  ID 132364 gen 8279931 top level 5 path .timemachine
  ID 132365 gen 8245691 top level 82186 path Veeam-Repo-01/.snapshots
  ID 141963 gen 8280829 top level 257 path home/admin
  root@MVH-RNAS72:~#

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ReadyNAS 4312 - 54TB usable full even though the only thing stored 49TB LUN

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