[Gluster-users] How to find out data alignment for LVM thin volume brick

[mabi]

Dear Strahil,

Thank you very much for pointing me to the RedHat documentation. I wasn't aware of it and it is much more detailed. I will have to read it carefully.

Now as I have a single disk (no RAID) based on that documentation I understand that I should use a data alignment value of 256kB.

Best regards,
Mabi

------- Original Message -------
On Wednesday, June 7th, 2023 at 6:56 AM, Strahil Nikolov <hunter86_bg at yahoo.com> wrote:

> 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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