ZFS: Difference between revisions

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* 1G for boot partition with "boot" as the partition label (also called name in some tools) and ef00 as partition code

* ~~10G~~ for a swap partition with "swap" as the partition label and 8200 as partition code. We will encrypt this with a random secret on each boot.

* 4G for a swap partition with "swap" as the partition label and 8200 as partition code. We will encrypt this with a random secret on each boot.

* The rest of disk space for zfs with "root" as the partition label and 8300 as partition code (default code)

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In low-memory situations, ZFS therefore might need a bit longer to free up memory from its cache. The swap partition will help with that.

Example ~~output from fdisk~~:

Example with gdisk:

sudo gdisk /dev/nvme0n1

GPT fdisk (gdisk) version 1.0.~~9.1~~

GPT fdisk (gdisk) version 1.0.10

...

Command (? for help): p

# boot partition

~~Disk /dev/nvme0n1: 500118192 sectors~~, ~~238.5 GiB~~

Command (? for help): n

~~Sector size (logical/physical~~): ~~512/512 bytes~~

Partition number (1-128, default 1):

~~Disk identifier~~ (~~GUID~~): ~~CA926E8C-47F6-416A-AD1A-C2190CF5D1F8~~

First sector (2048-1000215182, default = 2048) or {+-}size{KMGTP}:

~~Partition table holds up to 128 entries~~

Last sector (2048-1000215182, default = 1000215175) or {+-}size{KMGTP}: +1G

~~Main partition table begins at~~ sector ~~2 and ends at sector 33~~

Current type is 8300 (Linux filesystem)

~~First usable sector is 34~~, ~~last usable sector is 500118158~~

Hex code or GUID (L to show codes, Enter = 8300): ef00

~~Partitions will be aligned on 2048~~-~~sector boundaries~~

Changed type of partition to 'EFI system partition'

~~Total free space~~ is ~~2669 sectors~~ (~~1.3 MiB~~)

~~Number Start~~ (sector) ~~End~~ (~~sector~~) ~~Size Code Name~~

# Swap partition

~~1 2048 2099199 1024.0 MiB EF00 boot~~

Command (? for help): n

~~2 2099200 23070719 10.0 GiB~~ 8200 swap

Partition number (2-128, default 2):

~~3 23070720 500117503 227.5 GiB 8300 root~~

First sector (2099200-1000215182, default = 2099200) or {+-}size{KMGTP}:

Last sector (2099200-1000215182, default = 1000215175) or {+-}size{KMGTP}: +4G

Current type is 8300 (Linux filesystem)

Hex code or GUID (L to show codes, Enter = 8300): 8200

Changed type of partition to 'Linux swap'

Command (? for help):

# root partition

Command (? for help): n

Partition number (3-128, default 3):

First sector (10487808-1000215182, default = 10487808) or {+-}size{KMGTP}:

Last sector (10487808-1000215182, default = 1000215175) or {+-}size{KMGTP}:

Current type is 8300 (Linux filesystem)

Hex code or GUID (L to show codes, Enter = 8300):

Changed type of partition to 'Linux filesystem'

# write changes

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING

PARTITIONS!!

Do you want to proceed? (Y/N): y

OK; writing new GUID partition table (GPT) to /dev/nvme0n1.

The operation has completed successfully.

</syntaxhighlight>

@@ Line 52: / Line 52: @@
 * 1G for boot partition with "boot" as the partition label (also called name in some tools) and ef00 as partition code
-* 10G for a swap partition with "swap" as the partition label and 8200 as partition code. We will encrypt this with a random secret on each boot.
+* 4G for a swap partition with "swap" as the partition label and 8200 as partition code. We will encrypt this with a random secret on each boot.
 * The rest of disk space for zfs with "root" as the partition label and 8300 as partition code (default code)
@@ Line 58: / Line 58: @@
 In low-memory situations, ZFS therefore might need a bit longer to free up memory from its cache. The swap partition will help with that.
-Example output from fdisk:
+Example with gdisk:
 <syntaxhighlight lang="bash">
 sudo gdisk /dev/nvme0n1
-GPT fdisk (gdisk) version 1.0.9.1
+GPT fdisk (gdisk) version 1.0.10
 ...
-Command (? for help): p
+# boot partition
-Disk /dev/nvme0n1: 500118192 sectors, 238.5 GiB
+Command (? for help): n
-Sector size (logical/physical): 512/512 bytes
+Partition number (1-128, default 1):
-Disk identifier (GUID): CA926E8C-47F6-416A-AD1A-C2190CF5D1F8
+First sector (2048-1000215182, default = 2048) or {+-}size{KMGTP}:
-Partition table holds up to 128 entries
+Last sector (2048-1000215182, default = 1000215175) or {+-}size{KMGTP}: +1G
-Main partition table begins at sector 2 and ends at sector 33
+Current type is 8300 (Linux filesystem)
-First usable sector is 34, last usable sector is 500118158
+Hex code or GUID (L to show codes, Enter = 8300): ef00
-Partitions will be aligned on 2048-sector boundaries
+Changed type of partition to 'EFI system partition'
-Total free space is 2669 sectors (1.3 MiB)
-Number  Start (sector)    End (sector)  Size       Code  Name
+# Swap partition
-            2048         2099199   1024.0 MiB  EF00  boot
+Command (? for help): n
-         2099200        23070719   10.0 GiB    8200  swap
+Partition number (2-128, default 2):
-        23070720       500117503   227.5 GiB   8300  root
+First sector (2099200-1000215182, default = 2099200) or {+-}size{KMGTP}:
+Last sector (2099200-1000215182, default = 1000215175) or {+-}size{KMGTP}: +4G
+Current type is 8300 (Linux filesystem)
+Hex code or GUID (L to show codes, Enter = 8300): 8200
+Changed type of partition to 'Linux swap'
-Command (? for help):
+# root partition
+Command (? for help): n
+Partition number (3-128, default 3):
+First sector (10487808-1000215182, default = 10487808) or {+-}size{KMGTP}:
+Last sector (10487808-1000215182, default = 1000215175) or {+-}size{KMGTP}:
+Current type is 8300 (Linux filesystem)
+Hex code or GUID (L to show codes, Enter = 8300):
+Changed type of partition to 'Linux filesystem'
+# write changes
+Command (? for help): w
+Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
+PARTITIONS!!
+Do you want to proceed? (Y/N): y
+OK; writing new GUID partition table (GPT) to /dev/nvme0n1.
+The operation has completed successfully.
 </syntaxhighlight>