Grub Error 2

PTrenholme · 02-07-2008, 07:09 AM

Quote:

Originally Posted by Ozonecy

<snip> Is possible [to now] create array so I will have 1x 160gb? But I don't want to [reinstall] again.
</snip>

Well, one of the things you can do with LVM is to create a logical partition that spans more than one physical drive. But doing that with a distribution like Ubuntu could be difficult since the Ubuntu "initial ram disk" (initrd) does not include the LVM software by default. So, yes, you can do it, but it's not going to be easy if you use Ubuntu.

I understand that you don't want to hear this, but:

If you go back to Fedora (i.e., reinstall it on your now broken RAID setup), then all you'd need to do is use the LVM commands to add an "extent" to the / partition in the LV. (There are tutorials on LVM under the Tutorials button at the top of this web page.)

Person_1873 · 02-08-2008, 04:51 AM

might i suggest removing your RAID configuration? i mean. If you have 2 80GB HDD's and your running 2 OS's or distro's or w/e, why not just have them separate? it would make things one hell of a lot less confusing, ever heard of the KISS principle "keep it simple"

Ozonecy · 02-08-2008, 01:46 PM

hey again
how can now create raid to have one 160GB without format?
i must install LVM ?

PTrenholme · 02-08-2008, 02:35 PM

Well, first, it wouldn't be RAID since you'd loose the redundancy.

That said, remember that Linux uses a unified file system. Instead of keeping each drive separate (like the old IBM/360 and Windows operating systems), in *NIX operating systems "everything is a file." For example, here's a level 1 tree of my / directory:

Code:

$ tree -L 1 /
/
|-- MX6436
|-- NT
|-- Shared
|-- Ubuntu
|-- W98
|-- XP
|-- bin
|-- boot
|-- dev
|-- etc
|-- home
|-- lib
|-- lost+found
|-- media
|-- mnt
|-- opt
|-- proc
|-- root
|-- sbin
|-- selinux
|-- srv
|-- sys
|-- tmp
|-- tss-1
|-- usb
|-- usr
`-- var

The green entries in that list are file systems that reside on different hard drives (or partitions) from the one containing the root file system. In your case, the simplest solution (after fixing the partition table) would be to use the mkfs.ext3 command to create a new ext3 file system on the second drive, and then mount the drive on some mount point you'd create under /. You can make the drive a permanent part of your file system by adding the appropriate line to /etc/fstab. (The red entry is a network file system, and the blue entry is a USB drive.)

Again, here's an example of a line from my kubuntu fstab where I connect to the XP drive on this computer:

Code:

$ cat /Ubuntu/etc/fstab | grep XP
UUID=72ECD97FECD93E53 /XP     ntfs-3g    defaults,umask=007,gid=46 0       1

(The UUID value is found by running the command ls -l /dev/disk/by-uuid and finding the UUID of the drive and partition you wish you mount.)

Note that most Linux users will not mount additional drives as children of / as I have done. In your case, you could just do a mkdir in your home directory, and mount the second disk there.

Bottom line: You only need LVM if you want to "merge" the two drives into a single "logical" drive. If you just want the second drive to be available for use as an additional directory, all you need to do is format it, create the directory where you want it to "appear," and edit /etc/fstab so it gets mounted there every time you boot your system.