Re: [linux-lvm] Where are the data blocks of an LV?
See https://talk.manageiq.org/t/lvm-internals-structures-disk-layout/1328 On 26 July 2022 09:16:31 Marcin Owsiany wrote: Hello, I know that it is possible to find where a given logical volume's extents start on a PVs thanks to the information printed by lvdisplay --maps. I was also able to experimentally establish that the actual data of an LV starts one megabyte after that location. Is that offset documented anywhere, or can I somehow discover it at runtime for a given LV? regards, Marcin ___ linux-lvm mailing list linux-lvm@redhat.com https://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ ___ linux-lvm mailing list linux-lvm@redhat.com https://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
Re: [linux-lvm] Where are the data blocks of an LV?
Checkout https://github.com/sdgathman/lbatofile It was written to identify the file affected by a bad block (so it goes the opposite direction), but the getpvmap() function obtains pe_start and pe_size plus the list of segments. findlv() goes through the segments to find the one an absolute sector is in. That should tell you what you want to know. On Fri, 22 Jul 2022, Marcin Owsiany wrote: I know that it is possible to find where a given logical volume's extents start on a PVs thanks to the information printed by lvdisplay --maps. I was also able to experimentally establish that the actual data of an LV starts one megabyte after that location. Is that offset documented anywhere, or can I somehow discover it at runtime for a given LV? ___ linux-lvm mailing list linux-lvm@redhat.com https://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
[linux-lvm] Where are the data blocks of an LV?
Hello, I know that it is possible to find where a given logical volume's extents start on a PVs thanks to the information printed by lvdisplay --maps. I was also able to experimentally establish that the actual data of an LV starts one megabyte after that location. Is that offset documented anywhere, or can I somehow discover it at runtime for a given LV? regards, Marcin ___ linux-lvm mailing list linux-lvm@redhat.com https://listman.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
