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