Messages in this thread | | | Date | Thu, 25 Jun 1998 05:16:20 -0400 (EDT) | From | "Albert D. Cahalan" <> | Subject | Re: (reiserfs) Re: LVM / Filesystems / High availability |
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Michael Marxmeier writes: > Stephen C. Tweedie wrote: >> On Tue, 23 Jun 1998 20:26:14 +0200, Michael Marxmeier <mike@msede.com>
>>> There are two levels of LVM on HP-UX: >> >>> 1. The basic LVM functionality is to provide a virtual block device >>> (logical volumes) and also provides some RAID levels. Resizing of >>> filesystem requires unmounting and using the extendfs utility. >> >> md already provides the ability to do much of this. The question is >> whether we need to actually resize existing [virtual] block devices: > > LVM extends on the capabilities of MD. > - MD is limited to block devices whereas LVM is much more flexible > to support non-continguous devices as well. > - standard administration > - the LVM design could more easily extended > > I would like MD to be replaced by LVM.
MD can provide the real block devices.
LVM can be a user-space abstraction. All your admin tools would work in terms of an LVM, perhaps defined in /etc/lvm.conf. The kernel filesystem code uses multiple block devices, but you don't have to know that.
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