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From: Ilia Zykov <mail@izyk.ru>
Message-ID: <b54c26c3-ce43-674e-d620-28fc2f369956@izyk.ru>
Date: Thu, 28 Feb 2019 12:48:23 +0300
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Subject: Re: [linux-lvm] Filesystem corruption with LVM's pvmove onto a PV
 with a larger physical block size
Reply-To: LVM general discussion and development <linux-lvm@redhat.com>
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To: LVM general discussion and development <linux-lvm@redhat.com>, Ingo Franzki <ifranzki@linux.ibm.com>

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Content-Type: text/plain; charset=utf-8
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>=20
> Well, there are the following 2 commands:
>=20
> Get physical block size:=20
>  blockdev --getpbsz <device>
> Get logical block size:
>  blockdev --getbsz <device>
>=20
> Filesystems seem to care about the physical block size only, not the lo=
gical block size.
>=20
> So as soon as you have PVs with different physical block sizes (as repo=
rted by blockdev --getpbsz) I would be very careful...

Hello everybody.
Maybe, I don=E2=80=99t understand what do you mean. What the logical bloc=
k 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 =E2=80=9C=E2=80=93getbsz=E2=80=9D forever 4096.
But I think it must be forever 512.
What does it mean?

Thank you.
Ilia.


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