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 TBI then added 9 x 12 TB Seagate ST12000NE007 drives for a total of 45 drives in 3 RAID setsCompleted the expand operation to only get 279 TB of spaceRaid calculators show that I should have approx 425 TB of space Attached image shows that RAID set 3 has unallocated space of 135 TB but I cannot see how to get the unallocated space to become allocated Have updated firmware and restartedThere are no expand or other options listed under the RAID sets Any help would be apprieated Thank you

pmcwilliam wrote:I cannot see how to get the unallocated space to become allocatedWhat you are seeing is normal.Add data to your data volume and that space should become allocated as needed. This is how BTRFS works by design. It's not recommended to fill the data volume too full though.

Thank you for your replyMy issue is that I cannot add space to my iSCSI LUN's or create new iSCSI LUN's because the unit does not think it has free spaceSo while it might be normal if I was adding data to the volume, I am trying to expand iSCSII have attached screen shots, I do see that under RAID Group #3 some space has moved from Unallocated to Data Allocated Any thoughts on how to expand current LUN's or create new iSCSI LUN's when the unit does not think it has any free space? ThanksPaul

Edit: Hmmm. Re-read your post.This is a bit strange. Maybe if you filled up the metadata on the first 2 layers (create a new share with lots of small files) then some metadata will have to be allocated on RAID layer 3 that might change things.Metadata contains data about data. Some of this is fixed per file no matter whether your file is 1KB or 1TB which is why adding lots of small files is best.I wonder if metadata needs to be allocated on a layer for it to be used for iSCSI LUNs.I would make sure your backup is up to date before trying that.

The device is being used as an iSCSI target for Veeam backupsThe Netgear is reporting that I have 297.08 TB of space with 3.84 KB freeThere are 3 iSCSI LUNs, thick provisionedLUN 1 40 TB - Drive shows but not details or shownLUN 2 100 TB - Windows shows - 99 TB of space with 29 TB freeLUN 3 139 TB - Windows shows 120 TB of space with 1.44 TB free, 20 TB not yet allocated280 TB are allocated to iSCSI LUNs iSCSI target, Dell R630 Server 2012 R2 STDRAID Group 3 on the Netgear shows 128 TB unallocated (see image)Somehow this data is not allocated to the Data Volume and is not available for useAnd I'm using space on the device when I don't have any other shares or snapshots enabled

pmcwilliam wrote: Somehow this data is not allocated to the Data Volume and is not available for use I think you are misunderstanding what allocated/unallocated means. Free space is a somewhat slippery concept with the BTRFS file system. BTRFS allocates space for your data (i.e. your LUNS) and metatdata in "chunks". If a chunk is only partially filled with data, there is free space in the chunk - but it is wasted. If a chunk holds no data, it is entirely free space, and not allocated. FWIW, this wasted space can be reclaimed by running a balance (which will consolidate used space, reducing the amount of unused space in the allocated chunks). So your screen shot says that the full size of your data volume is 426.37 TiB (297.97+128.40). This breaks down into 297.97 TiB Used space (actually used by files - in this case LUNs) ~0 Allocated-Used of "wasted" free space, that isn't actually available for use. 128.40 TiB Unallocated free space that can be used for new LUNs or shares. I am a bit puzzled on why the metadata total doesn't add up. That is, the three groups have 6.08 GB of allocated space for metadata between them, but the total allocation is reported as 3.04 GB. Not sure that is worth chasing down, but you could take a look with ssh if you want to try. pmcwilliam wrote: The Netgear is reporting that I have 297.08 TB of space with 3.84 KB free Where are you seeing this (particularly the 3.84 KB free part)? Can you post that screen shot?

RR4360X - RAID 60 volume size incorrect

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mdgm
Virtuoso
Dec 21, 2019
pmcwilliam wrote:
I cannot see how to get the unallocated space to become allocated
What you are seeing is normal.

Add data to your data volume and that space should become allocated as needed. This is how BTRFS works by design.

It's not recommended to fill the data volume too full though.
- pmcwilliam
  Aspirant
  Dec 24, 2019
  Thank you for your reply
  My issue is that I cannot add space to my iSCSI LUN's or create new iSCSI LUN's because the unit does not think it has free space
  So while it might be normal if I was adding data to the volume, I am trying to expand iSCSI
  I have attached screen shots, I do see that under RAID Group #3 some space has moved from Unallocated to Data Allocated
  
  Any thoughts on how to expand current LUN's or create new iSCSI LUN's when the unit does not think it has any free space?
  
  Thanks
  Paul
  - mdgm
    Virtuoso
    Dec 25, 2019
    Edit: Hmmm. Re-read your post.
    
    This is a bit strange. Maybe if you filled up the metadata on the first 2 layers (create a new share with lots of small files) then some metadata will have to be allocated on RAID layer 3 that might change things.
    
    Metadata contains data about data. Some of this is fixed per file no matter whether your file is 1KB or 1TB which is why adding lots of small files is best.
    
    I wonder if metadata needs to be allocated on a layer for it to be used for iSCSI LUNs.
    
    I would make sure your backup is up to date before trying that.

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RR4360X - RAID 60 volume size incorrect

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