Dne 19. 11. 25 v 18:38 Brian J. Murrell napsal(a):
On Wed, 2025-11-19 at 18:31 +0100, Zdenek Kabelac wrote:
I've been also thinking - that adding support of 'dumb' mirroring of
thinLV
into pvmove - isn't a very difficult request - so we will see -
although
obviously copying 10TiB empty thin volume isn't going to be 'a fast
operation' this way - but it's not any worse then a 'dd'.
Not any worse than 'dd' would be more than acceptable. How can
anything be faster at physically moving data than dd as it is usually
only slowed by the speed of the storage in any case?
If the tool would have known 'which areas' are mapped (which knows thin-pool
target internally) then it would need to copy only those blocks.
(this can be just small fraction of the hole volume size)
On a device level - we see 'just' zero areas - but those need to be mirrored -
as on this level there no difference between 'zero' and 'unwritten' data.
(Btw with this knowledge the Joe's blk-archive tools is working)
Zdenek
