On Wed, 2024-01-10 at 12:19 -0600, Thomas Cameron wrote:
> I assume the installer chose the block size, since I basically did a
> "next, next, next" installation. Should I have chosen something different?
I didn't choose block sizes, just some partition sizes in bytes on my
systems. So I'd hope the install routine from the ISO files would make
some tests and choose things wisely (ha ha!) for me.
CentOS on a HDD:
[root@rocky ~]$ blockdev --report /dev/sda
RO RA SSZ BSZ StartSec Size Device
rw 256 512 4096 0 1000204886016 /dev/sda
[root@rocky ~]$ fdisk -l /dev/sda
WARNING: fdisk GPT support is currently new, and therefore in an
experimental phase. Use at your own discretion.
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes, 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk label type: gpt
Fedora on a SSD:
[root@fluffy ~]# blockdev --report /dev/sda
RO RA SSZ BSZ StartSec Size Device
rw 256 512 4096 0 500107862016 /dev/sda
[root@fluffy ~]# fdisk -l /dev/sda
Disk /dev/sda: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: Samsung SSD 860
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
And looking into the man file for blockdev:
--getbsz
Print the blocksize in bytes. This size does not describe device
topology. It’s the size used internally by the kernel and it may be
modified (for example) by filesystem driver on mount.
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