[kwlug-disc] Adding (setting up) 2nd disk.

unsolicited unsolicited at swiz.ca
Tue Jan 26 15:00:25 EST 2010


Thanks for the note. I get all this. Or I'm still missing something. 
The instructions still seem to be putting /home and /data on different 
partitions, not the same one.

(It's a laptop - there ain't gonna be any more disks or partitions, 
and it isn't going to grow any. Otherwise, I probably would have used 
LVM.)

What I don't get is how both /home and /data are on the second disk 
(partition actually, but never mind that), if fstab is mounting /home 
at /dev/sda6. (When / is /dev/sda3.) How is /data on the 2nd disk set up?

Unless fstab mounts /disk2 at /dev/sda6, I create /disk2/home and 
/disk2/data and create /home and /data as links (hard?) there.

Good search terms for such aren't occurring to me.

Thanks for any thoughts.

john at netdirect.ca wrote, On 01/26/2010 10:46 AM:
> kwlug-disc-bounces at kwlug.org wrote on 01/26/2010 08:39:14 AM:
> 
>> I'm setting up a kubuntu 9.10 box, 3 partitions: OS, swap, data.
>>
>> I would like /home and other good stuff, say /data, to be on the 
>> second disk.
>>
>> How do I do this / what are the magic google terms?
>>
>> mount the 2nd disk as /disk2, and create /home and /data and link them 
>> to /home and /data on the 2nd disk?
>>
>> Normally, one would make an entire partition as /something, like 
>> /home. Here I want multiple /somethings on the second disk.
>>
>> Are there other good things that should be there too? I presume /etc 
>> is right out, probably /usr too. /var?
>>
>> Good reference doc appreciated - "linux partitioning" drowns me as a 
>> search term.
> 
> It a fairly subtle task and might not be searchable.
> 
> On a new install you would choose an advanced disk set up and set up 
> partitions and mount points manually.
> 
> If you are retro-fitting a disk then you could do a short set of simple 
> commands (assuming /dev/sdb)
> 
> 1. fdisk /dev/sdb # Create partitions, if they don't already exist. Keep 
> in mind any data on the disk will be lost.
> 2. mke2fs -j /dev/sdb1; mke2fs -j /dev/sdb2 # Create file systems.
> 3. Edit /etc/fstab to add the new file systems, mount then on the proper 
> destinations (i.e. /home and /data)
> 4. mount /home; mount /data # Mount the file systems. This command will 
> ensure that you fstab entries are correct.
> 
> A side task might be to temporarily mount the file systems (mkdir -p 
> /mnt/tmp; mount /dev/sdb1 /mnt/tmp) and move over the data from the 
> existing folder (mv /home/* /mnt/tmp). Then umount and mount on the right 
> mount point (umount /mnt/tmp; mount /home) 
> 
> You might also consider using LVM instead of raw partitions. LVM allows 
> you to expand file systems easily and add disks as needed. This is a 
> little more complicated:
> 
> 1. fdisk /dev/sdb # create one partition
> 2. pvcreate /dev/sdb1 # Initialize the partition as a LVM Physical Volume
> 3. vgcreate MyData /dev/sdb1 # Create the Volume Group named MyData
> 4. lvcreate -L 20G -n home MyData # Create a 20GB volume group named 
> "home"
> 5. lvcreate -L 60G -n data MyData #Create a 60GB volume named "data"
> 6. mke2fs -j /dev/MyData/home; mke2fs -j /dev/MyData/data # Create file 
> systems on the LVs
> 7. Edit /etc/fstab and add the file systems.
> 8. mount /home; mount /data # Mount the file systems.
> 
> When creating LVs you might want to consider leaving unallocated space. In 
> other words don't assign all the disk space to LVs. Then as you use the 
> file systems you will see where you need more space and you can 
> re-allocate then. It's easy to add disk to an LV, it's harder to take it 
> away.
> 
> 
> John Van Ostrand
> Net Direct Inc.
>  
> CTO, co-CEO
> 564 Weber St. N. Unit 12
> map
>  
> Waterloo, ON N2L 5C6
>  
> john at netdirect.ca
> Ph: 866-883-1172
> ext.5102
> Linux Solutions / IBM Hardware
> Fx: 519-883-8533
>  
> 
> 
> 
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