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.ga25...@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 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 > > 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.
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