A second Extended Partition ?(fdisk)
charlescurley at charlescurley.com
Wed Jun 7 22:24:15 MDT 2006
On Wed, Jun 07, 2006 at 07:21:42PM -0600, MT Morales wrote:
> I have an unsual request to create 5 more partitions out of one which is
> currently a primary (/dev/sda3). I was thinking about destroying /dev/sda3
> and create a second extended partition. fdisk shows the following:
> Command (m for help): p
> Disk /dev/sda: 73.2 GB, 73274490880 bytes
> 255 heads, 63 sectors/track, 8908 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
> Device Boot Start End Blocks Id System
> /dev/sda1 * 1 15 120456 83 Linux
> /dev/sda2 16 1099 8707230 83 Linux
> /dev/sda3 1100 7251 49415940 83 Linux
> /dev/sda4 7252 8908 13309852+ f Win95 Ext'd (LBA)
> /dev/sda5 7252 7888 5116671 83 Linux
> /dev/sda6 7889 8398 4096543+ 82 Linux swap
> /dev/sda7 8399 8908 4096543+ 83 Linux
Try instead: fdisk -l /dev/sda
> As you can see there are no sectors left on the current extended one, and I
> can only destroy /dev/sda3 to create 5 logical ones, is this even possible?
> i.e. Is it possible to create a second extended partition out of a primary?
> Is the number of extended partitions limited to one under fdisk?
To get five logical partitions, you will need to create two more
extended partitions, as an extended partition holds at most four
logical partitions (unless that's changed since I was doing this sort
of thing. Your present extended partition has a place in its table,
but no room for it within the extended partition.
> I didn't see any obvious options under fdisk to create a second extended
You should only get that option if you are creating partitions one
> Again, the only cylinders I can use for these 5 new partitions are the ones
> used by /dev/sda3. All others are already in use. There is already one
> extended partition and it's fully utilized.
> Any ideas or suggestion on how to go about creating 5 additional partitions
> from cylinders: 1100 to 7251? or I'm just simply screwed?
* Build yourself a bootable CD with finnix.
* Back everything up. Everything.
* Verify the integrity of your backups.
* Delete every partition you have except sda1.
* Create three new extended partitions, numbered two through four.
* Create new logical partitions to your heart's content.
* Create file systems as needed.
* Restore data.
* Edit /etc/fstab, particularly with regard to the old sda2 and 3
partitions. sda5, 6 and 7 will now show up in the first extended
parttion, formerly sda2. sda2 and 3 will disappear; you'll have to
re-assign those to sda8 and 9.
Or look into LVM, which will also require massive backup and similar
steps. Do not get rid of your boot partition or put it into a logical
volume; some kernels don't have LVM drivers until after the initrd is
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