Re: The size specified by "lvcreate -L" is not accurate

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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@xxxxxxxxxx - info@xxxxxxxxxx
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