Dne 11. 04. 19 v 12:01 Eric Ren napsal(a):
Hi,
Another error message is:
"Failed to suspend thin snapshot origin ..."
which is in _lv_create_an_lv():
```
7829 } else if (lv_is_thin_volume(lv)) {
7830 /* For snapshot, suspend active thin origin first */
...
is active */
7843 if (!update_pool_lv(pool_lv, 0)) {
7844 stack;
7845 goto revert_new_lv;
7846 }
```
I don't understand why we need to suspend_lv_origin() and resume_lv_origin()
in line?
And, what reasons might cause this errors?
Hi
When you take any snapshot (thin or thick) the origin LV is suspend with
fsfreeze operation - so the snapshot is takes with filesystem in 'consistent'
state.
Otherwise without this - you may end-up with fs junk in your device - as the
metadata of the filesystem might have stated in page-cache - and no fsck
utility would be able to figure out what should be correct state of 'fs'
without losing various amount of data in this operation.
Regards
Zdenek
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