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From: Gionatan Danti <>
To: LVM general discussion and development <>
Cc: "Yu, Mingli" <>
Subject: Re: [linux-lvm] The size specified by "lvcreate -L" is not accurate
Date: Thu, 02 Sep 2021 15:24:00 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Il 2021-09-02 05:26 Yu, Mingli ha scritto:
> Per
> [1], after e2fsprogs upgrades to 1.46.4, the defaults for mke2fs now
> call for 256 byte inodes for all file systems (with the exception of
> file systems for the GNU Hurd, which only supports 128 byte inodes)
> and use "lvcreate -L 50 -n lv_test1 vg_test && mke2fs
> /dev/vg_test/lv_test1" and then continue to check the partiontion as
> below.(use lvm2 2.03.11 for the test)
>  # df -h | grep dev/mapper/vg_test-lv_test1
>  /dev/mapper/vg_test-lv_test1   48M   14K   46M   1% /mnt/lv-test
>  Though claim 50M as above, but it turns out to be only 48M.

I think that allocation are done in multiple of physical extent size 
which, by default, is at 4 MB.
50 is not a multiple of 4 while 48 is, so "lvcreate" probably rounded 
down the required size.
Using one or more "-v" should bring progressively more details.


Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. -
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GPG public key ID: FF5F32A8

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  reply	other threads:[~2021-09-02 13:33 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-02  3:26 [linux-lvm] The size specified by "lvcreate -L" is not accurate Yu, Mingli
2021-09-02 13:24 ` Gionatan Danti [this message]
2021-09-02 14:23   ` Zdenek Kabelac

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