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This topic has been translated from a Chinese forum by GPT and might contain errors.
Original topic: tikv下线慢
[TiDB Usage Environment] Production Environment
[TiDB Version] 6.5.1
[Reproduction Path]
Currently, there are 6 TiKV nodes, each with 2.1G of data. Yesterday, two temporary TiKV nodes were added, and when the data synchronization reached around 40G, the nodes were taken offline. It’s been almost 18 hours now, and they are still Pending Offline. Should I continue to wait?
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First, try to recover it, then take it offline again. It seems to be stuck!
Is it 2.1G of data per machine? If you can’t take it offline, I suggest checking the PD monitoring panel.
Before adding new nodes, each TiKV has 2.1T of data.
Does it mean that if the disk usage of a TiKV node exceeds 80%, it will stop migrating?
Are both machines going offline at the same time?
Yes, I see that the disk timeout on other TiKV nodes has exceeded 80%.
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Isn’t it usually an odd number of nodes?
This won’t work. With fewer than three replicas, it will be stuck. You need to wait for one TiKV replica to migrate before you can take another TiKV offline.
There were previously 6 TiKV nodes.
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There are no specific requirements for this; we have always had 4 machines.
Do I need to expand the disks of other TiKV nodes to below 80%?
Why are the regions of the newly added node still increasing?
If the space is less than the low-space-ratio, it will not continue to schedule to this node. It is not recommended to adjust the low-space-ratio configuration because TiKV must reserve a certain amount of space. Otherwise, compaction cannot be performed, as it always requests space first and then releases space 
When there are writes, it will split. The splitting is done by TiKV itself, not by PD scheduling.
I performed a scale-in operation on these two machines yesterday. Will data still be written to them?
I need to take these two TiKV nodes offline now, how should I do it?
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