Gluster users - Jun 2023 - How to find out data alignment for LVM thin volume brick

Hello,

I am preparing a brick as LVM thin volume for a test slave node using this
documentation:

https://docs.gluster.org/en/main/Administrator-Guide/formatting-and-mounting-bricks/

but I am confused regarding the right "--dataalignment" option to be
used for pvcreate. The documentation mentions the following under point 1:

"Create a physical volume(PV) by using the pvcreate command. For example:

pvcreate --dataalignment 128K /dev/sdb

Here, /dev/sdb is a storage device. Use the correct dataalignment option based
on your device.

    Note: The device name and the alignment value will vary based on the device
you are using."

As test disk for this brick I have an external USB 500GB SSD disk from Samsung
PSSD T7 (https://semiconductor.samsung.com/consumer-storage/portable-ssd/t7/)
but my question is where do I find the information on which alignment value I
need to use for this specific disk?

Best regards,
Mabi

Have you checked this page:
https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.5/html/administration_guide/brick_configuration
?
The alignment depends on the HW raid stripe unit size.
Best Regards,Strahil Nikolov?
 
 
  On Tue, Jun 6, 2023 at 2:35, mabi<mabi at protonmail.ch> wrote:   Hello,

I am preparing a brick as LVM thin volume for a test slave node using this
documentation:?

https://docs.gluster.org/en/main/Administrator-Guide/formatting-and-mounting-bricks/

but I am confused regarding the right "--dataalignment" option to be
used for pvcreate. The documentation mentions the following under point 1:

"Create a physical volume(PV) by using the pvcreate command. For example:

pvcreate --dataalignment 128K /dev/sdb

Here, /dev/sdb is a storage device. Use the correct dataalignment option based
on your device.

? ? Note: The device name and the alignment value will vary based on the device
you are using."

As test disk for this brick I have an external USB 500GB SSD disk from Samsung
PSSD T7 (https://semiconductor.samsung.com/consumer-storage/portable-ssd/t7/)
but my question is where do I find the information on which alignment value I
need to use for this specific disk?

Best regards,
Mabi 
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