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

unsolicited unsolicited at swiz.ca
Tue Jan 26 15:33:35 EST 2010


You got it.

Mind you - I'll have to think hard on what Raul said to make sure I've 
got my head straight on it. Not what he said, but the ramifications of 
it. Sort of my mental view of the world, as it were.

Colin Mackay wrote, On 01/26/2010 3:28 PM:
> Tue, you mount filesystems, my apologies.  But apparently, you can
> mount a folder into another folder as well with "mount --bind /dir1
> /dir2"
> 
> Found another link to explain it better:
> http://aplawrence.com/Linux/mount_bind.html
> 
> As "unsolicited" stated (Sorry, can't recall the real name), he does
> not want two file systems, just one with a "home" and a "data"
> directory.  He then wants "home" to be his /home and "data" to be
> /data.
> 
> So if he mounts /dev/sda2 into /mnt/drive2 and creates
> /mnt/drive2/data and /mnt/drive2/home, he should then be able to use
> "mount --bind /mnt/drive2/home /home" and "mount --bind
> /mnt/drive2/data /data" to do what he wants.  He now has one partition
> (with one file system) that has two directories.
> 
> Please, correct me if I am wrong, "unsolicited".
> 
> 
> 
> On Tue, Jan 26, 2010 at 3:20 PM, Raul Suarez <rarsa at yahoo.com> wrote:
>> I think there is some confusion here:
>>
>>
>> You mount file systems into directories.
>> You do not mount partitions.
>> You do not mount directories.
>>
>> i.e.
>>
>> If you have your second partition with two directories
>> /home
>> /data
>>
>> you actually mount the / of that file system into a directory of the primary file system.
>>
>> Raul Suarez
>>
>> Technology consultant
>> Software, Hardware and Practices
>> _________________
>> http://rarsa.blogspot.com/
>> An eclectic collection of random thoughts
>>
>>
>> --- On Tue, 1/26/10, unsolicited <unsolicited at swiz.ca> wrote:
>>
>>> From: unsolicited <unsolicited at swiz.ca>
>>> Subject: Re: [kwlug-disc] Adding (setting up) 2nd disk.
>>> To: "KWLUG discussion" <kwlug-disc at kwlug.org>
>>> Received: Tuesday, January 26, 2010, 3:00 PM
>>> 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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