ho to split data to two disks

bong.mau · 07-03-2007, 01:59 PM

Hi

env:machine with 2 hard disk on the same ide bus
usually i splitted data around 2 disks creating partition and mount points......
is there a way to automatically split data on the two disks
no matter about where data goes....
i raise the question because partitioning let me some unused space
on each partition.

i hope the question is clear.

thanks in advance

any help will be appreciated
Maurizio

marozsas · 07-03-2007, 03:51 PM

Take a look at LVM (Logical Volume Manager) that can build a data space from several disks.

http://www.tldp.org/HOWTO/LVM-HOWTO/index.html

bong.mau · 07-07-2007, 05:44 AM

Hi...

first..thanks for the suggestion .

i set up lvm and i installed mandriva .....
operating system see the two disk as only one...

a question :

LVM can manage the two disks as disk1 + disk2
filling disk2 only when disk1 is full
or it can stripe data across the two disk.

how can i check if data are striped across the two disks ?

thanks in advance

Maurizio

marozsas · 07-07-2007, 06:47 AM

You can choose one of two modes: linear or data strip.
Read the Chapter 3. Anatomy of LVM, subsection 3.7, mapping modes (linear/striped).

I don't know how to check if data is stripped. You can at least, get info about how the volume groups were created, I mean, linear or striped. Use the cmd line tools to get all info you want or to create a volume group with settings other than default.

The default mode is linear.

bong.mau · 07-08-2007, 10:01 AM

Hi ..
thanks for the answer

Mandriva installation dialog do not permit me to choose between linear or striping..
i only heard the rumor of the second drive heads when the swap space is mounted..

so my suspect about linear....
your answer confirms my suspects...

now i have to find another tool to format partitions ..tools located into a bootable cdrom....

i have heard in the past about qparted as one of the best...

i will search it or something similar on one of my (few..) bootable disks

Maurizio