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Murrell" , "linux-lvm@lists.linux.dev" References: <1b6fb117-7283-4ba9-91ee-7412a2d77b3d@gmail.com> <29209080-c09b-40df-86c3-f22c1d7f6520@interlinx.bc.ca> <5067ec8d-991b-4b90-ad3b-f9dbbb0472d5@gmail.com> <81e51a5ad8f9c32610b8262447af635da81d53c3.camel@interlinx.bc.ca> <3620fc27-e54b-472d-bc82-be01f7b2739b@gmail.com> <6D706D06-AB0F-4C55-9F68-E8E07926A511@yahoo.com> <9c2a15d0-0d7d-4462-af43-83221c2ecbdd@gmail.com> <94679191.5310372.1763572932545@mail.yahoo.com> <42516759-f09a-407a-9c2d-1f82d0db19af@gmail.com> Content-Language: en-US, cs From: Zdenek Kabelac In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit 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