[Maas-devel] curtin custom partitions
Kyle O'Donnell
kyleo at 0b10.mx
Sat Aug 9 02:04:29 UTC 2014
first off Newell thanks so much for your help on this!
ok here is were I ended up...
updated to the newest version of curtin
changed block-meta.py to support x86_64 for the newly added /boot
updated /etc/maas/preseeds/curtin_userdata though I dont think this actually did anything:
paritioning_commands:
10_wipepart: ['curtin wipe', '--quick', '--all-unused-disks']
20_makepart: ['curtin', 'block-meta', 'simple-boot']
changed curtin/helpers/common to hardcode the desired partition sizes
I also added some force clear/create partition tables for good measure in the pt_gpt function:
sgdisk -Z "$target" # this kills everything
sgdisk -og "$target" # this recreates the gpt
sgdisk -p "$target" # this prints the table
i tried (unsuccessfully) to create a 50G partition via:
sgdisk --new "15:2048:+1M" --typecode=15:ef02 \
--new "1:4096:2097152" --typecode=1:8300 \
--new "2::104960000" --typecode=2:8300 "$target" ||
{ error "failed to gpt partition $target"; return 1; }
sgdisk --new "15:2048:+1M" --typecode=15:ef02 \
--new "1:4096:+1G" --typecode=1:8300 \
--new "2::+50G" --typecode=2:8300 "$target" ||
{ error "failed to gpt partition $target"; return 1; }
sgdisk --new "15:2048:+1M" --typecode=15:ef02 \
--new "1:4096:+1G" --typecode=1:8300 \
--new "2::50G" --typecode=2:8300 "$target" ||
{ error "failed to gpt partition $target"; return 1; }
All of the above resulted in a /dev/sda2 that was the full size of the remaining disk
checkout the debug output...
Number Start (sector) End (sector) Size Code Name
1 4096 2097152 1022.0 MiB 8300
2 2099200 104960000 49.0 GiB 8300
15 2048 4095 1024.0 KiB EF02
+ sgdisk -v /dev/sda
No problems found. 5750030267 free sectors (2.7 TiB) available in 3
segments, the largest of which is 5750026206 (2.7 TiB) in size.
Notice it says partition 2 is 49G and the output says the largest partition is 2.7TiB WTF?!?!?!?!
Then I tried to add in a 3rd partition to see what it would do, worst case I can just delete this after the fact:
sgdisk --new "15:2048:+1M" --typecode=15:ef02 \
--new "1:4096:+1G" --typecode=1:8300 \
--new "2::+50G" --typecode=2:8300 \
--new "3::+50G" --typecode=2:8300 "$target" ||
this had the 'desired' result but i'll be removing /dev/sda3
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 50G 951M 46G 2% /
none 4.0K 0 4.0K 0% /sys/fs/cgroup
udev 48G 4.0K 48G 1% /dev
tmpfs 9.5G 684K 9.5G 1% /run
none 5.0M 0 5.0M 0% /run/lock
none 48G 0 48G 0% /run/shm
none 100M 0 100M 0% /run/user
/dev/sda1 976M 42M 867M 5% /boot
# sgdisk -p /dev/sda
Disk /dev/sda: 5854986240 sectors, 2.7 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 38A5CC89-2EBA-4255-A6C4-8632BB72247E
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 5854986206
Partitions will be aligned on 2048-sector boundaries
Total free space is 5643171773 sectors (2.6 TiB)
Number Start (sector) End (sector) Size Code Name
1 4096 2101247 1024.0 MiB 8300
2 2101248 106958847 50.0 GiB 8300
3 106958848 211816447 50.0 GiB 8300
15 2048 4095 1024.0 KiB EF02
----- Original Message -----
From: "Kyle O'Donnell" <kyleo at 0b10.mx>
To: "Newell Jensen" <newell.jensen at canonical.com>
Cc: "maas-devel" <maas-devel at lists.launchpad.net>
Sent: Friday, August 8, 2014 11:45:53 AM
Subject: Re: [Maas-devel] curtin custom partitions
1.5.2 (latest distributed with 14.04)
i have filed a report thanks
https://bugs.launchpad.net/maas/+bug/1354426
----- Original Message -----
From: "Newell Jensen" <newell.jensen at canonical.com>
To: "Kyle O'Donnell" <kyleo at 0b10.mx>
Cc: "maas-devel" <maas-devel at lists.launchpad.net>
Sent: Friday, August 8, 2014 11:44:26 AM
Subject: Re: [Maas-devel] curtin custom partitions
Kyle,
See comments inline below:
On Fri, Aug 8, 2014 at 5:34 AM, Kyle O'Donnell <kyleo at 0b10.mx> wrote:
> looks like I have found a bug in the common script which creates the
> partition
>
> 1) it says the default is gpt but without any options specified it is
> executing pt_mbr)
>
In trunk, line 210 for common has the format set to "gpt" by default. What
version of curtin do you have?
>
> 2) there are params passed to the command executed within pt_mbr,
> specifically the size of the partition, which does not work, see some debug
> output below:
>
> starting COMMON KYLE
> ending common KYLE
> I AM EXECUTING pt_mbr
> 1 disk is larger than max for mbr (2TB)
> target /dev/sda size 2997752954880 end maxend pt1size 107372134
> 1 sfdisking with: echo '2048,107374182,L,*' | sfdisk --no-reread --force
> --Linux --unit S /dev/sda
>
> i over changed the value of pt1size to the desired size, and the command
> which is executed confirms that the command is passed that value. the
> problem is sfdisk seems to ignore this and still create the
partition of the max size based n the 2TB limit.
>
You should file a bug report for this.
>
>
>
>
>
> ----- Original Message -----
> From: "Newell Jensen" <newell.jensen at canonical.com>
> To: "Kyle O'Donnell" <kyleo at 0b10.mx>
> Cc: "maas-devel" <maas-devel at lists.launchpad.net>
> Sent: Thursday, August 7, 2014 8:48:04 PM
> Subject: Re: [Maas-devel] curtin custom partitions
>
> Kyle,
>
> Looks like me email updated me with your new email after I sent
> mine...weird.
>
> In any event, the default partition function that is called in that shell
> script is pt_gpt, not pt_mbr. The reason there is a cap on pt_mbr is due
> to the size limitation that MBR has:
>
> "The organization of the partition table in the MBR limits the maximum
> addressable storage space of a disk to 2 TB
> <http://en.wikipedia.org/wiki/Tebibyte> (232 × 512 bytes)."
>
>
>
>
>
> On Thu, Aug 7, 2014 at 5:34 PM, Kyle O'Donnell <kyleo at 0b10.mx> wrote:
>
> > I *think* I found it:
> >
> > /usr/lib/curtin/helpers/common
> >
> > specifically the pt_mbr function:
> >
> > local start="2048" pt1size="" maxsize="4294967296"
> >
> > Which corresponds to the partition it creates:
> > /dev/sda1 * 2048 4294967295 2147482624 83 Linux
> >
> >
> > ----- Original Message -----
> > From: "Kyle O'Donnell" <kyleo at 0b10.mx>
> > To: "Newell Jensen" <newell.jensen at canonical.com>
> > Cc: "maas-devel" <maas-devel at lists.launchpad.net>
> > Sent: Thursday, August 7, 2014 7:22:02 PM
> > Subject: Re: [Maas-devel] curtin custom partitions
> >
> >
> >
> > How does it determine its going to create a single 2TB root filesystem?
> > What code can i change to do this?
> > On Aug 7, 2014 7:17 PM, Newell Jensen <newell.jensen at canonical.com>
> wrote:
> >
> > Kyle,
> >
> > Currently there is no support for creating a custom partition table using
> > the fastpath installer. This would be a nice feature.
> >
> > Newell
> >
> >
> > On Thu, Aug 7, 2014 at 1:35 PM, Kyle O'Donnell < kyleo at 0b10.mx > wrote:
> >
> >
> > Hi,
> >
> > I am trying to figure out how to create a custom partition table using
> the
> > fastpath installer. Has anyone done this before?
> >
> > I have ~2.7TB of usable drive space, the default install creates one 2TB
> > partition of root and nothing else. I'd like to be able to configure lvm,
> > but I would settle for being able to set the root partition size.
> >
> > Thanks,
> > Kyle
> >
> > --
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