linux-lvm.redhat.com archive mirror
 help / color / mirror / Atom feed
From: Gionatan Danti <g.danti@assyoma.it>
To: LVM general discussion and development <linux-lvm@redhat.com>
Cc: "Yu, Mingli" <Mingli.Yu@windriver.com>
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: <ba1b736723487985ec076d499d89313b@assyoma.it> (raw)
In-Reply-To: <PH0PR11MB501412E2C1081FA98208E545F1CE9@PH0PR11MB5014.namprd11.prod.outlook.com>

Il 2021-09-02 05:26 Yu, Mingli ha scritto:
> Per
> https://git.kernel.org/pub/scm/fs/ext2/e2fsprogs.git/tree/doc/RelNotes/v1.46.4.txt
> [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.

Regards.

-- 
Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti@assyoma.it - info@assyoma.it
GPG public key ID: FF5F32A8

_______________________________________________
linux-lvm mailing list
linux-lvm@redhat.com
https://listman.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/


  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 Yu, Mingli
2021-09-02 13:24 ` Gionatan Danti [this message]
2021-09-02 14:23   ` Zdenek Kabelac

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=ba1b736723487985ec076d499d89313b@assyoma.it \
    --to=g.danti@assyoma.it \
    --cc=Mingli.Yu@windriver.com \
    --cc=linux-lvm@redhat.com \
    --subject='Re: [linux-lvm] The size specified by "lvcreate -L" is not accurate' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).