[lug] Server Partitioning Recommendation
hugh at math.byu.edu
Thu Jan 18 19:34:10 MST 2007
dio2002 at indra.com wrote:
>>> B) help isolate the impacts of partition corruption.
>> I've never seen this, only whole-drive failure. I'm sure it can happen,
>> though. Keep revisioned backups such as rdiff-backup or regular offline
>> backups. Don't span LVM across multiple physical devices.
> I thought the whole purpose of LVM was so that you "can" span multiple
> physical devices. Why would I not want to span LVM across physical
IMO, the whole point of LVM is to be able to grow partitions as you need
them (which doesn't preclude multiple physical devices, but it doesn't
require it either).
One reason to be careful about spanning across physical devices is that
if the LV is on multiple physical devices and one of them goes south,
then you've lost the whole LV. If you don't mind the risk of one of
your PVs disappearing and taking with it all the LV's that were on it,
then span multiple physical devices (I'm assuming that the physical
devices are not RAID devices and that you haven't carefully allocated
your LV's so that they only stay on one PV).
When I use LVM, I tend not to use up all of the physical storage. I
create LV's that are sufficient for my needs. Then over time, I can
grow them as necessary with the unallocated physical extents.
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