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

Raul Suarez rarsa at yahoo.com
Tue Jan 26 15:20:15 EST 2010


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
>> > 
> > 
> > _______________________________________________
> > kwlug-disc_kwlug.org mailing list
> > kwlug-disc_kwlug.org at kwlug.org
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> > 
> 
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