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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> Content-Language: en-US, cs From: Zdenek Kabelac In-Reply-To: <94679191.5310372.1763572932545@mail.yahoo.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Dne 19. 11. 25 v 18:22 matthew patton napsal(a): > Right,  so LVMThin(1) conveniently omits "Oh BTW standard functionality like pvmove() is not implemented." > > lvmthin is a sub-set or sub-class of LVM, therefore any reasonable person would assume all functionality cascades down. Because it pretty much does for everything else. > >> lvm2 has 'no idea'  which disk space is in-use for any individual thin LV. >> (there are tools like 'thin_ls/thin_rmap' for that) > > And any reasonable person would assume lvmthin would have implemented the necessary hooks so that pvmove() would work by lvmthin handing lvm back a linked-list of all of the pieces in the correct order so they could be written to lvm(thick) or to another lvmthin pool. This is not that big of a cognitive leap. > > That Linux LVM thin is missing "obvious" functionality is fine, it just needs to be stated very clearly. Yep thanks this is a legit complain, we will improve our doc to be way more clear about this. 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'. Regards Zdenek