> > Well, there are the following 2 commands: > > Get physical block size: > blockdev --getpbsz <device> > Get logical block size: > blockdev --getbsz <device> > > Filesystems seem to care about the physical block size only, not the logical block size. > > So as soon as you have PVs with different physical block sizes (as reported by blockdev --getpbsz) I would be very careful... Hello everybody. Maybe, I don’t understand what do you mean. What the logical block size mean? But on my machines(CentOS7), this utility get me the strange results (output reduced): smartctl -i /dev/sda; blockdev --getbsz --getpbsz /dev/sda Device Model: INTEL SSDSC2KB480G8 User Capacity: 480,103,981,056 bytes [480 GB] Sector Sizes: 512 bytes logical, 4096 bytes physical Rotation Rate: Solid State Device 4096 4096 smartctl -i /dev/sdb; blockdev --getbsz --getpbsz /dev/sdb Device Model: HGST HUS722T2TALA604 User Capacity: 2,000,398,934,016 bytes [2.00 TB] Sector Size: 512 bytes logical/physical Rotation Rate: 7200 rpm Form Factor: 3.5 inches 4096 512 As you see “–getbsz” forever 4096. But I think it must be forever 512. What does it mean? Thank you. Ilia.
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