On Fri, Dec 24, 2010 at 7:57 AM, Markandeya <mrc55519 at gmail.com> wrote: > Dear Friends of CentOS, > I read a reply by John R Pierce, Re: [CentOS] LVM change disk > December 04, 2010 01:30PM > "do you realize that if any one of those 4 miscellaneous drives fails, > you lose the whole volume?" > > Can anyone confirm this? and thank you to John above. > > 2: can you add(extend) a physical hdd with data to a LV without losing the data? > > 3: can you remove one hdd to add another of same size and file system > but with different data? > > Thanks much. i am about to install and need to know my constraints. LVM is just like the name implies a logical volume manager. It allows you to easily combine and carve space from physical disks. It doesn't provide any redundancy. If you want redundancy you either need to use the LVM mirror capability, linux software raid with mdadm, or a hardware raid card. Ryan