How do I preseed a disk to 50% / and /tmp?

Question

I need to install ubuntu server 10.04 by preseed file and part disk into 50% for / and rest for /tmp. I tried this:

    # Partitioning
# use first hard drive SCSI/SATA:
d-i partman-auto/disk string /dev/sda
d-i partman-auto/method string regular
d-i partman-auto/purge_lvm_from_device boolean true
d-i partman-lvm/device_remove_lvm boolean true
d-i partman-md/device_remove_md boolean true
d-i partman-lvm/confirm boolean true
d-i partman-auto/choose_recipe select atomic

# Actualy use 50% for / and rest 50% for /LOGS
d-i partman-auto/expert_recipe string                         \
      boot-root ::                                            \
              2048 50% 1000000000 ext4                        \
                      $primary{ }                             \
                      method{ format } format{ }              \
                      use_filesystem{ } filesystem{ ext4 }    \
                      mountpoint{ / }                         \
              .                                               \
              2048 50% -1 ext4                                \
                      method{ format } format{ }              \
                      use_filesystem{ } filesystem{ ext4 }    \
                      mountpoint{ /TMP}                       \
              .                                               \
              50% 4096 50% linux-swap                         \
                      method{ swap } format{ }                \
              .

d-i partman-partitioning/confirm_write_new_label boolean true
d-i partman/choose_partition select finish
d-i partman/confirm boolean true
d-i partman/confirm_nooverwrite boolean true

Can anyone tell me, why it doesn't works? It creates only 1.9 Gb to / and /tmp.

Thanks!

Solution 1

It seems that I solve that problem. I should use digital values instead of percentage.

# Partitioning
# use first hard drive SCSI/SATA:
d-i partman-auto/disk string /dev/sda
d-i partman-auto/method string regular
d-i partman-auto/purge_lvm_from_device boolean true
d-i partman-lvm/device_remove_lvm boolean true
d-i partman-md/device_remove_md boolean true
d-i partman-lvm/confirm boolean true
d-i partman-auto/choose_recipe select atomic

# Actualy use 50% for / and rest 50% for /TMP
d-i partman-auto/expert_recipe string                         \
      boot-root ::                                            \
              2048 30720 1000000000 ext4                      \
                      $primary{ }                             \
                      method{ format } format{ }              \
                      use_filesystem{ } filesystem{ ext4 }    \
                      mountpoint{ / }                         \
              .                                               \
              50% 4096 50% linux-swap                         \
                      method{ swap } format{ }                \
              .                                               \
              2048 30720 -1 ext4                              \
                      method{ format } format{ }              \
                      use_filesystem{ } filesystem{ ext4 }    \
                      mountpoint{ /TMP }                      \
              .                                               \

d-i partman-partitioning/confirm_write_new_label boolean true
d-i partman/choose_partition select finish
d-i partman/confirm boolean true
d-i partman/confirm_nooverwrite boolean true

Solution 2

It looks like your definitions are wrong, so partman might be misinterpreting it. If you look at the spec (e.g. here) then the order of the limits is:

<minimal size> <priority> <maximal size> <parted fs>

So your initial version had a "50%" priority. Your swap was correct (according to the spec) but gave a swap partition that was 50% of the size of your memory (so 1GB if you had 2GB RAM) with a priority of 4096.

Comments

[psusi]

Why on earth do you want a dedicated and very large /tmp partition? Normally /tmp is mounted as a tmpfs so its contents are kept in ram/swap for fast access. Putting it on a hard disk will slow things down, and using such a large and dedicated partition for it makes it more likely that one or the other partition will fill up while there is plenty of space on the other.

[MaXi32]

I'm getting more confuse about the priority when you talking about the size of memory (RAM).

[MaXi32]

How can the system determine RAM size with priority..