Le 2021-06-22 20:21, Gilles Mocellin a écrit :
Hello Cephers,
On a capacitive Ceph cluster (13 nodes, 130 OSDs 8To HDD), I'm
migrating a 40
To image from a 3+2 EC pool to a 8+2 one.
The use case is Veeam backup on XFS filesystems, mounted via KRBD.
Backups are running, and I can see 200MB/s Throughput.
But my migration (rbd migrate prepare / execute) is staling at 4% for
6h now.
When the backups are not running, I can see a little 20MB/s of
throughput,
certainly my migration.
I need a month to migrate 40 TB at that speed !
Hello,
It seems worst, this morning, I still see a 4% completed status.
The metrics I can see other the last 12h are not showing much
activity...
So it seems more stale than slow.
Is anyone using that rbd migration command, on reasonable sized image ?
And of course between different data pools ?
During my initial tests, it worked, but with little and quite empty test
images (1 TB)...
I will investigate an alternate method, like :
- snapshot src image
- copy src image to new data pool (new image name)
- unmount src image
- export-diff | import-diff delta from src image with snap to dest image
- test mount dest image
- delete src image
- rename dest image
The unknown duration here is for the export/import diffs. But during the
initial copy, my production can continue.
Anyon has already done something similar and can comment on the
duration, or pinpoints ?
--
Gilles
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