Re: Current thoughts on system partitioning
From: Dave Brown (dhbrown_at_hobbes.dhbrown.net)
Date: 01/16/05
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Date: Sun, 16 Jan 2005 01:42:13 GMT
In article <2046975.5Ta5ugbet6@kn.mid.digitalprojects.com>,
Alexander Skwar wrote:
> · Peter T. Breuer <ptb@lab.it.uc3m.es>:
>
>> Roger Leigh <${roger}@invalid.whinlatter.uklinux.net.invalid> wrote:
>> But it doesn't make any difference EXCEPT inasmuch as you don't have to
>> have contiguous space for a partition. You can resize lvs and normal
>> partitions just as well one as the other.
>
> Well, you *can* resize a normal partition. But doesn't that require
> a reboot if there's mounted stuff on the disk?
>
>> The diadvantage is that you don't know where on the real disk your data
>> is, so if you have several disks and you lose one, you could lose an
>> important part of everything.
>
> Yep, that's a problem. Can be somewhat circumvented by using
> RAID. Because of that, I would not span a vg over multiple
> pv's at home - or when there's no RAID.
>
>> "pinning" would be a good thing (tm) to
>> add to LVM.
Even with LVM1, you "can" control which PV your LV is on... it's an option
when creating/extending a LV to specify PV.
LVs can be resized while in use, no problem. The problem may be when you
resize the filesystem on the LV. If it's ext2/ext3, you must unmount; if
it's reiserfs, you can resize while in use. (AFAIK--things keep changing;
and I'm talking LVM1 here. I still use LVM1, as I share VGs between a
couple of different Linux bootups; ( I have to support back to RH 9 and
SuSE 8.2.)
Nonetheless, running on top of a hardware RAID is a great idea. I
wouldn't do it with software RAID.
-- Dave Brown Austin, TX
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