[Bug 1947514] [NEW] Wish to specify the size of the rpool datapool/partition during installation

[BertN45]

Public bug reported:

I like to be able to specify the size of the rpool partition during
installation at the moment I select ZFS, you could ask to specify the
size or to use the whole disk. The remainder of the disk could be left
empty. I like that feature for the following reasons:

- Many users like me will have a SSD and a HDD, limiting the size of the rpool partition will allow them to use part of the SSD as a L2ARC/ZIL for the HDD.
- My current laptop HDD is 2TB and a rpool partition of 2TB makes Ubuntu very slow, when after a while the HDD gets fragmented. Due to OS updates the OS gets scattered all over the HDD resulting in considerable longer HDD seek times. A smaller rpool datapool (I would choose say 10GB) would speed up the OS on the HDD.
- It would allow us to use the gnome-disk-utility as simple backup of last resort for the EFI, rpool and bpool partitions. For my laptop and desktop I could store those two backups for example on an old 160GB USB HDD.
- I don't like to store my VMs in the USERDATA dataset nor in another own dataset in the rpool datapool. However on the desktop I like them on the nvme-SSD, but preferably in an own datapool with own properties.

ProblemType: Bug
DistroRelease: Ubuntu 21.10
Package: ubiquity (not installed)
ProcVersionSignature: Ubuntu 5.13.0-19.19-generic 5.13.14
Uname: Linux 5.13.0-19-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.11-0ubuntu70
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Sun Oct 17 12:25:05 2021
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
InstallationDate: Installed on 2021-10-09 (7 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
SourcePackage: ubiquity
Symptom: installation
UpgradeStatus: Upgraded to impish on 2021-10-14 (3 days ago)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug impish ubiquity-21.04.19 wayland-session

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https://bugs.launchpad.net/bugs/1947514

Title:
  Wish to specify the size of the rpool datapool/partition during
  installation

Status in ubiquity package in Ubuntu:
  New

Bug description:
  I like to be able to specify the size of the rpool partition during
  installation at the moment I select ZFS, you could ask to specify the
  size or to use the whole disk. The remainder of the disk could be left
  empty. I like that feature for the following reasons:

  - Many users like me will have a SSD and a HDD, limiting the size of the rpool partition will allow them to use part of the SSD as a L2ARC/ZIL for the HDD.
  - My current laptop HDD is 2TB and a rpool partition of 2TB makes Ubuntu very slow, when after a while the HDD gets fragmented. Due to OS updates the OS gets scattered all over the HDD resulting in considerable longer HDD seek times. A smaller rpool datapool (I would choose say 10GB) would speed up the OS on the HDD.
  - It would allow us to use the gnome-disk-utility as simple backup of last resort for the EFI, rpool and bpool partitions. For my laptop and desktop I could store those two backups for example on an old 160GB USB HDD.
  - I don't like to store my VMs in the USERDATA dataset nor in another own dataset in the rpool datapool. However on the desktop I like them on the nvme-SSD, but preferably in an own datapool with own properties.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.10
  Package: ubiquity (not installed)
  ProcVersionSignature: Ubuntu 5.13.0-19.19-generic 5.13.14
  Uname: Linux 5.13.0-19-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu70
  Architecture: amd64
  CasperMD5CheckResult: pass
  CurrentDesktop: ubuntu:GNOME
  Date: Sun Oct 17 12:25:05 2021
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed maybe-ubiquity quiet splash ---
  InstallationDate: Installed on 2021-10-09 (7 days ago)
  InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
  SourcePackage: ubiquity
  Symptom: installation
  UpgradeStatus: Upgraded to impish on 2021-10-14 (3 days ago)

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