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Updated Debian Jessie Root on ZFS (markdown)

George Melikov 2017-03-09 21:16:48 +04:00
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Debian-Jessie-Root-on-ZFS.md

@ -5,9 +5,8 @@
* This instruction uses GRUB from the `testing` repository for now! * This instruction uses GRUB from the `testing` repository for now!
### System Requirements ### System Requirements
* [64-bit Debian GNU/Linux Jessie Live CD](http://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/debian-live-8.6.0-amd64-standard.iso) * [64-bit Debian GNU/Linux Jessie Live CD](http://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/)
* 64-bit computer (amd64, a.k.a. x86_64) computer * 64-bit computer (amd64, a.k.a. x86_64) computer preferred
* A drive which presents 512B logical sectors. Installing on a drive which presents 4KiB logical sectors (a “4Kn” drive) should work with UEFI partitioning, but this has not been tested.
Computers that have less than 2 GiB of memory run ZFS slowly. 4 GiB of memory is recommended for normal performance in basic workloads. If you wish to use deduplication, you will need [massive amounts of RAM](http://wiki.freebsd.org/ZFSTuningGuide#Deduplication). Enabling deduplication is a permanent change that cannot be easily reverted. Computers that have less than 2 GiB of memory run ZFS slowly. 4 GiB of memory is recommended for normal performance in basic workloads. If you wish to use deduplication, you will need [massive amounts of RAM](http://wiki.freebsd.org/ZFSTuningGuide#Deduplication). Enabling deduplication is a permanent change that cannot be easily reverted.
@ -90,7 +89,7 @@ Always use the long `/dev/disk/by-id/*` aliases with ZFS. Using the `/dev/sd*`
On Solaris systems, the root filesystem is cloned and the suffix is incremented for major system changes through `pkg image-update` or `beadm`. Similar functionality for APT is possible but currently unimplemented. Even without such a tool, it can still be used for manually created clones. On Solaris systems, the root filesystem is cloned and the suffix is incremented for major system changes through `pkg image-update` or `beadm`. Similar functionality for APT is possible but currently unimplemented. Even without such a tool, it can still be used for manually created clones.
3.2 Create a filesystem dataset for the root filesystem of the Ubuntu system: 3.2 Create a filesystem dataset for the root filesystem of the Debian system:
# zfs create -o canmount=noauto -o mountpoint=/ rpool/ROOT/debian # zfs create -o canmount=noauto -o mountpoint=/ rpool/ROOT/debian
# zfs mount rpool/ROOT/debian # zfs mount rpool/ROOT/debian
@ -289,7 +288,7 @@ If you are creating a mirror, repeat the grub-install command for each disk in t
5.5b For UEFI booting, install GRUB: 5.5b For UEFI booting, install GRUB:
# grub-install --target=x86_64-efi --efi-directory=/boot/efi \ # grub-install --target=x86_64-efi --efi-directory=/boot/efi \
--bootloader-id=ubuntu --recheck --no-floppy --bootloader-id=debian --recheck --no-floppy
5.6 Verify that the ZFS module is installed: 5.6 Verify that the ZFS module is installed:
@ -299,7 +298,7 @@ If you are creating a mirror, repeat the grub-install command for each disk in t
6.1 Snapshot the initial installation: 6.1 Snapshot the initial installation:
# zfs snapshot rpool/ROOT/ubuntu@install # zfs snapshot rpool/ROOT/debian@install
In the future, you will likely want to take snapshots before each upgrade, and remove old snapshots (including this one) at some point to save space. In the future, you will likely want to take snapshots before each upgrade, and remove old snapshots (including this one) at some point to save space.
@ -391,7 +390,7 @@ As `/var/log` is already compressed by ZFS, logrotate’s compression is going t
9.2 Optional: Delete the snapshot of the initial installation: 9.2 Optional: Delete the snapshot of the initial installation:
$ sudo zfs destroy rpool/ROOT/ubuntu@install $ sudo zfs destroy rpool/ROOT/debian@install
9.3 Optional: Disable the root password 9.3 Optional: Disable the root password