Il 16-09-2017 20:33 Eric Sandeen ha scritto:
I don't think I said that - this is the first time you've mentioned /alignment/, and I've seen no indication of your alignment one way or another. that specifies a 4k block size, which is already the default. You're conflating a lot of issues here - log alignment, sector size, physical & logical block size presented by both the underlying storage and the zvol ... I cannot speak to zvols, as I have no experience with them. But if the underlying storage is 512e/4k then you may want to specify the 4k /sector/ size with -s size=4k. -Eric
Hi Eric, you are right: I messed up the terminology. Sorry for the noise.
I was really speaking about *sector* size. In short, when using ZVOL the physical disk's sector size is not directly announced to the higher layer filesystem. This, in turn, cause mkfs.xfs to automatically select a 512B sector size, even when running on top of 512e/4Kn disks.
From previous emails/threads, I was under impression that XFS sector size only very marginally affect performance. It that true? Can I stick with default mkfs settings? Or should I manually select 4K sector size ("-s size=4k")?
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