Bug 1250627 - lvcreate --type raid1 -m 1 -l 90%vg -n cache0 vgcache.0 /dev/sda /dev/sdd # takes up all 100%
lvcreate --type raid1 -m 1 -l 90%vg -n cache0 vgcache.0 /dev/sda /dev/sdd # t...
Status: NEW
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: lvm2 (Show other bugs)
x86_64 Linux
unspecified Severity high
: rc
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Assigned To: Alasdair Kergon
Depends On:
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Reported: 2015-08-05 11:25 EDT by lejeczek
Modified: 2017-08-02 02:49 EDT (History)
8 users (show)

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Description lejeczek 2015-08-05 11:25:52 EDT
Description of problem:

is this normal? Does -l work?
Only if I specify size with -L 200G I see free PEs in VG.

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Comment 2 Marian Csontos 2015-08-10 11:28:12 EDT
Yes, `-l` works: it is specifying the approximate size of the LV created not the total space consumed. In this case 2 90%vg RAID legs are created, and LVM correctly caps that at 100%.
Comment 3 Marian Csontos 2015-08-10 11:36:49 EDT
Hmmm, seems it "works" and after all it IS a bug:

> When expressed as a  percentage, the  number  is  treated  as  an
> approximate  upper  limit for the total number of physical extents to be
> allocated (including extents used by any mirrors, for example).

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