On Sat, 29 Aug 2020 16:34:56 +0100 antlists <antlists@xxxxxxxxxxxxxxx> wrote: > On 28/08/2020 21:39, Ram Ramesh wrote: > > One thing about LVM that I am not clear. Given the choice between > > creating /mirror LV /on a VG over simple PVs and /simple LV/ over raid1 > > PVs, which is preferred method? Why? > > Simplicity says have ONE raid, with ONE PV on top of it. > > The other way round is you need TWO SEPARATE (at least) PV/VG/LVs, which > you then stick a raid on top. I believe the question was not about the order of layers, but whether to create a RAID with mdadm and then LVM on top, vs. abandoning mdadm and using LVM's built-in RAID support instead: https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/logical_volume_manager_administration/mirror_create Personally I hugely prefer mdadm, due to the familiar and convenient interface of the program itself, as well as of /proc/mdstat. -- With respect, Roman
