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

Bob Jonkman bjonkman at sobac.com
Tue Jan 26 21:40:36 EST 2010


That's right.  Two drives, hda and hdb, both with only one partition on 
them.  The second drive has two folders[*], /var and /home which get 
mounted with the "bind" option.

Many thanx to the Ubuntu list, who got me through this:

  https://lists.ubuntu.com/archives/ubuntu-ca/2009-April/005901.html

--Bob.

[*] Yes, "Folders" is a Window-y term, but I use it to avoid the name space collision with X.500 directories.  Who decided it was a good idea to overload the word "Directory" anyway?



zixiekat at gmail.com wrote:
> That's using the 'bind' option, same as the mount --bind, correct?
>
> Sent wirelessly from my BlackBerry device on the Bell network.
> Envoyé sans fil par mon terminal mobile BlackBerry sur le réseau de Bell.
>
> -----Original Message-----
> From: Bob Jonkman <bjonkman at sobac.com>
> Date: Tue, 26 Jan 2010 20:36:54 
> To: KWLUG discussion<kwlug-disc at kwlug.org>
> Subject: Re: [kwlug-disc] Adding (setting up) 2nd disk.
>
> I've done the thing below, and it's been steady as a rock.  Did it 
> because I had two smallish drives, and didn't want to fragment the free 
> space among different partitions.
>
>
>     # /etc/fstab
>
>     /dev/hda1  /     ext3   defaults,errors=remount-ro  0  1
>
>     /dev/hdb1  /mnt/driveb   ext3  defaults  0  2
>
>     /mnt/driveb/var   /var   none  bind,defaults  0  0
>
>     /mnt/driveb/home  /home  none  bind,defaults  0  0
>
> --Bob.
>
> Bob Jonkman <bjonkman at sobac.com>         http://sobac.com/sobac/
> SOBAC Microcomputer Services              Voice: +1-519-669-0388
> 6 James Street, Elmira ON  Canada  N3B 1L5  Cel: +1-519-635-9413
> Software   ---   Office & Business Automation   ---   Consulting
>
>
>
>
> unsolicited wrote:
>   
>> 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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