Yes, disk alignment is only needed as the LVM stack cannot get the details of the HW Raids.In your case , use the default 256k as per documentation.
Best Regards,Strahil Nikolov Sent from Yahoo Mail for iPhone On Wednesday, June 7, 2023, 9:21 PM, mabi <m...@protonmail.ch> wrote: 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...@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<m...@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 ________ Community Meeting Calendar: Schedule - Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC Bridge: https://meet.google.com/cpu-eiue-hvk Gluster-users mailing list Gluster-users@gluster.org https://lists.gluster.org/mailman/listinfo/gluster-users
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