Re: best practice for lvm?
On Thu, Jun 04, 2009 at 01:41:47PM +1000, Alex Samad wrote:
> On Wed, Jun 03, 2009 at 10:08:57PM -0500, Zhengquan Zhang wrote:
> > On Thu, Jun 04, 2009 at 08:23:05AM +1000, Alex Samad wrote:
> > > On Wed, Jun 03, 2009 at 01:46:27PM -0500, Boyd Stephen Smith Jr. wrote:
> > > > In <[🔎] 20090603174408.GA25275@m364d1.ece.northwestern.edu>, Zhengquan Zhang
> > > > wrote:
> > > > >Can I say the best practice for lvm is to create a single partition for
> > > > >the harddrive and single PV on it
>
> [snip]
>
> > > I would suggest to never put / or /boot on a lvm partition and at most
> > > to put it on a raid1 set. Why incase something goes wrong, raid1 i much
> > > easier to dissect then lvm (and especially lvm on raid)
> >
> > Does that mean, lvm on raid is easier to dissect than lvm alone?
>
> No, the opposite, the more layers the more complexity.
>
>
> My typical setup for a hd (the first 2 or 3 drives in the machine is
>
> /boot 500M
> / 20G
> LVM or raid device
In that case, the first 2 or 3 drives have separate /boot and / but you
only use /boot and / on one of them?
>
> I raid1 Partition on disk 1+2 and use disk 3 as hot spare. I do the same
> for partition 2
>
>
> for partition 3 I group together all the disk's in raid1 or raid5 or
> raid 6 and then allocate that to lvm and then make up swap /var/log/
> /home etc
Now I figured that your point is never use LVM over / . and LVM over
raid for other partitions.
>
>
> >
> > This is my setup, /boot on raid1 and not on lvm, /root and /home are lvm
> > on raid1.
> >
> > Filesystem Size Used Avail Use% Mounted on
> > /dev/mapper/vg-root 4.6G 1.9G 2.5G 44% /
> > tmpfs 1008M 0 1008M 0% /lib/init/rw
> > udev 10M 104K 9.9M 2% /dev
> > tmpfs 1008M 0 1008M 0% /dev/shm
> > /dev/md0 92M 24M 63M 28% /boot
> > /dev/mapper/vg-home 910G 372G 492G 44% /home
> >
> >
> > >
> > > > /usr
> > > > /usr/local # For OS migrations.
> > > > /home
> > > > /opt
> > > > /srv
> > > > /var
> > > > /var/tmp # RAID 0 or other "fast"
> > > > /var/cache # RAID 0 or other "fast"
> > > > /tmp # Usually tmpfs; no LV
> > > >
> > > > >and leave enough unassigned PE for later enlargement of certain LV?
> > > >
> > > > It is much easier to expand a filesystem than to shrink it. This is true
> > > > even if you aren't using LVM.
> > >
> > >
> > >
> > > --
> > > "I want to thank you for taking time out of your day to come and witness my hanging."
> > >
> > > - George W. Bush
> > > 01/04/2002
> > > Austin, TX
> > > at the dedication of his portrait
> >
> >
> >
>
> --
> BOFH excuse #375:
>
> Root name servers corrupted.
--
Zhengquan
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