Re: rbd export-diff/import-diff hangs

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Figured it out. It's not rbd issue. Sorry for this false alarm.

Thanks!
Tony
________________________________________
From: Tony Liu <tonyliu0592@xxxxxxxxxxx>
Sent: August 27, 2023 08:19 PM
To: Eugen Block; ceph-users@xxxxxxx
Subject:  Re: rbd export-diff/import-diff hangs

It's export-diff from an in-use image, both from-snapshot and to-snapshot exist.
The same from-snapshot exists in import image, which is the to-snapshot from last diff.
export/import is used for local backup, rbd-mirroring is used for remote backup.
Looking for options to get more info to troubleshoot.


Thanks!
Tony
________________________________________
From: Eugen Block <eblock@xxxxxx>
Sent: August 27, 2023 11:53 AM
To: ceph-users@xxxxxxx
Subject:  Re: rbd export-diff/import-diff hangs

You mean the image is in use while you’re exporting? Have thought
about creating snapshots and exporting those? Or set up rbd mirroring?

Zitat von Tony Liu <tonyliu0592@xxxxxxxxxxx>:

> To update, hanging happens when updating local image, not remote, networking
> is not a concern here. Any advices how to look into it?
>
> Thanks!
> Tony
> ________________________________________
> From: Tony Liu <tonyliu0592@xxxxxxxxxxx>
> Sent: August 26, 2023 10:43 PM
> To: dev@xxxxxxx; ceph-users@xxxxxxx
> Subject:  rbd export-diff/import-diff hangs
>
> Hi,
>
> I'm using rbd import and export to copy image from one cluster to another.
> Also using import-diff and export-diff to update image in remote cluster.
> For example, "rbd --cluster local export-diff ... | rbd --cluster
> remote import-diff ...".
> Sometimes, the whole command is stuck. I can't tell it's stuck on
> which end of the pipe.
> I did some search, [1] seems the same issue and [2] is also related.
>
> Wonder if there is any way to identify where it's stuck and get more
> debugging info.
> Given [2], I'd suspect the import-diff is stuck, cause rbd client is
> importing to the
> remote cluster. Networking latency could be involved here? Ping
> latency is 7~8 ms.
>
> Any comments is appreciated!
>
> [1] https://bugs.launchpad.net/cinder/+bug/2031897
> [2] https://stackoverflow.com/questions/69858763/ceph-rbd-import-hangs
>
> Thanks!
> Tony
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