Strahil Nikolov
2023-Jun-07 04:56 UTC
[Gluster-users] How to find out data alignment for LVM thin volume brick
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 ________ 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 at gluster.org https://lists.gluster.org/mailman/listinfo/gluster-users -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.gluster.org/pipermail/gluster-users/attachments/20230607/8019e1de/attachment.html>
mabi
2023-Jun-07 18:21 UTC
[Gluster-users] How to find out data alignment for LVM thin volume brick
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 >> ________ >> >> 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 at gluster.org >> https://lists.gluster.org/mailman/listinfo/gluster-users-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.gluster.org/pipermail/gluster-users/attachments/20230607/07abec81/attachment.html>