Hello Oliver,
as 512e requires the drive to read a 4k block, change the 512 byte and then write back the 4k block to the disk, it should have a significant performance impact. However costs are the same, so always choose 4Kn drives.
as 512e requires the drive to read a 4k block, change the 512 byte and then write back the 4k block to the disk, it should have a significant performance impact. However costs are the same, so always choose 4Kn drives.
By the way, this might not affect you, as long as you write 4k at once but I'm unsure if that is given in any use case or in a Ceph specific scenario, therefore be save and choose 4Kn drives.
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Am Mo., 25. Feb. 2019 um 12:43 Uhr schrieb Oliver Schulz <oliver.schulz@xxxxxxxxxxxxxx>:
Dear all,
in real-world use, is there a significant performance
benefit in using 4kn instead of 512e HDDs (using
Ceph bluestore with block-db on NVMe-SSD)?
Cheers and thanks for any advice,
Oliver
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