Re: [gentoo-user] extending /usr partition...

[Jarry]

Alan McKinnon wrote:
>> cp -a /mnt/gentoo/backup/var /mnt/gentoo/var
>> cp -a /mnt/gentoo/backup/usr /mnt/gentoo/usr
>
> Um, no. This gives you new usr and var directories like so:
> /usr/usr/
> /var/var
>
> You want:
> cp -a /mnt/gentoo/backup/var /mnt/gentoo/
> cp -a /mnt/gentoo/backup/usr /mnt/gentoo/

Thanks for correction!

> With lvm, this becomes a breeze.

I remember having lvm2 a few years ago, and despite of that I could not
extend any partition, which was being used. What is then lvm2 good for,
if I can not extend partitions on-the-fly? I can not unmount /usr before
extending...

And one more counter-argument: with traditional partitions I can select
where a certain partition is (physically). Those partitions accessed
frequently I put to the beginning of the disk with higher transfer-rate.
In my case, it makes quite difference:

obelix ~ # hdparm -t /dev/md2
  Timing buffered disk reads:  252 MB in  3.02 seconds =  83.23 MB/sec

obelix ~ # hdparm -t /dev/md9
  Timing buffered disk reads:  150 MB in  3.02 seconds =  49.72 MB/sec

Jarry

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