On Wed, Jan 17, 2024 at 1:22 AM Andy Smith <andy@xxxxxxxxxxxxxx> wrote: > > Hi Phillip, > > On Tue, Jan 16, 2024 at 08:13:15PM +0000, Andy Smith wrote: > > On Tue, Jan 16, 2024 at 01:24:29PM -0500, Phillip Susi wrote: > > > No, it wouldn't be a problem without the partition table. ext4 uses its > > > own block size, which is pretty much always 4k. It doesn't know or care > > > about the underlying disk logical sector size. > > > > I've found quite a few people having similar problems to me so I'm > > not sure about this, but I haven't had chance to test it yet. I > > will try it out before I explore hdparm. > > I've tested ext4 directly on the LV with no partition table now and > you're correct - no issues there! Apologies for doubting you - so > many different vague accounts of issues out there. > > So, the actual problem here is something about the MBR partition > table. Off-topic now for this list but I wonder if there is a safe > and reliable way to modify such a partition table after sync to > allow this to work… > > Thanks, > Andy > You might have the 4k alignment off. IE the first 4k block on the partition actually is across 2 partial 4k blocks on the disk. What does fdisk -l look like on the 2 partition tables? You would want to make sure that the first partition is divisible by 8 and that the partition in the partition is also divisible by 8. Typically fdisk and other partitioning programs try to do that, but if someone manually adjusted it and/or an old enough version was used then it might be wrong.
