[Gluster-users] Questions about snapshots

[Varun]

Hi Stefan,

I'm not sure which doc are you referring to? It would help if you can share
it.

I would start looking at the barrier translator in
xlators/features/barrier. Initially it is designed to block all the ops
that modify the underlying file system from acknowledging the client. The
list of file system operations that needs to be blocked should be listed
here
<https://github.com/gluster/glusterfs/blob/87ec6483324d76071f27cfa83e0a644e4a38ec41/xlators/features/barrier/src/barrier.c#L747-L761>
.

WARNING: My knowledge is like a decade old. This information is to the best
of my memory. A very brief quick look at the git log of xlators/barrier
tells me no major changes.

So, in any case I would just read the code for barrier translator unless
the current maintainer can answer this.

Varun

On Mon, Jan 22, 2024 at 11:30 AM Stefan Kania <stefan at kania-online.de>
wrote:

> Hi to all,
>
> The doc is telling me:
> ------------------------
> To guarantee crash consistency some of the fops are blocked during a
> snapshot operation.
>
> These fops are blocked till the snapshot is complete. All other fops is
> passed through.
> -----------------------
> I could not find which fops are blocked, can anyone tell me wich fops
> are blocked and wich are not?
>
> Second question:
> Is there a way to calculate the size of a snapshot?
>
>
> Thank's for any valuable answer
>
> Stefan
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