Is my partition table properly aligned?


Apr 14, 2020
I installed using ZFS RAID0 on my nvme using the proxmox installer.
Is my partition table properly aligned?

Disk /dev/nvme0n1: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt

Device           Start       End   Sectors   Size Type
/dev/nvme0n1p1      34      2047      2014  1007K BIOS boot
/dev/nvme0n1p2    2048   1050623   1048576   512M EFI System
/dev/nvme0n1p3 1050624 976773134 975722511 465.3G Solaris /usr & Apple ZFS


Active Member
May 31, 2020
the Netherlands
The starts of your second and third partition are aligned on 1MB borders . The first is not but this one is never written to, so it does not really matter.
The end of the third partition is not aligned on a 1MB border (it is 13 sectors too large). The 1MB alignment is a modern standard. I don't know which is best for your drive.
You can check this by testing if the Start*Sector size is divisible by 1024*1024 (which is the same as checking whether Start is divisible by 2048 without remainder, in this case).


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