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Hello, I have Ready NAS storage 4220, I made volume consists of 5 disks (5*4TB) with RAID 5 and I made ISCSI Lun with size (13.48 TB) , the free space is (1.05TB) after three snapshots , I received email from the storage that the volume usage is above 95 % and therefore i delete all snapshots manually to resolve that alarm. So, If I want to use data protection option (snapshot) , is there any space consideration for snapshot, and what is the space required for each snapshot for the previous lun (13.48TB) Thanks.
When you first make a snapshot it uses no space. Every time a block changes in the LUN, the snapshot space goes up by a block. So the required snapshot space depends on the usage pattern.
With BTRFS it's good to maintain about 15% free space, and that's what you started with (with no snapshots). So maybe add another 4 TB drive to the array?
When you first make a snapshot it uses no space. Every time a block changes in the LUN, the snapshot space goes up by a block. So the required snapshot space depends on the usage pattern.
With BTRFS it's good to maintain about 15% free space, and that's what you started with (with no snapshots). So maybe add another 4 TB drive to the array?
Based on the description of the issue that you have provided, I may need to check this with others who can probably assist you and get back to you as soon as possible.
It depends entirely on what the changes are at the block level how much space snapshots will consume. It could be not a lot, or it could be quite a lot depending on how you use the LUN.
