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List:       linux-bcache
Subject:    Re: bcachefs snapshots
From:       Kent Overstreet <kent.overstreet () gmail ! com>
Date:       2021-07-20 21:09:35
Message-ID: YPc7j2tW+ZkfBAeH () moria ! home ! lan
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On Tue, Jul 20, 2021 at 01:28:33AM +0000, Eric Wheeler wrote:
> Hi Kent,
> 
> I read your bcachefs snapshots doc recently, it looks like you've put a 
> lot of thought into it.  Is it ready for testing?  
> 
> We use a lot of btrfs snapshots of VM images but the performance is pretty 
> poor and I'm looking forward to trying out bcachefs snapshots when it is 
> ready to try out.
> 
> We also have many dm-thin deployments backed by /dev/bcache0 volumes that 
> work quite well, but dm-thin meta is always an ongoing maintenance issue.
> (Don't run out of dm-thin meta space or *boom*!)
> 
> If bcachefs can replace dm-thin with loopback files (or even better, 
> native bcachefs devices!) then I look forward to getting beyond
> dm-thin into something more scalable.

It's not ready just yet - but the initial performance numbers are _extremely_
encouraging, I'll be posting more soon!
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