question on lvcreate

EdStevens

OL 8.3 , a vm under VBox

After initial creation of the vm and installtion of OL 8.3, I added a second 'disk', and wish to create a lvol on it.

The disk was sized at 12g. I got the disk partitioned (one single partition) and created a vgroup with it, yielding this:

[email protected] ~]# vgdisplay vg_u01
 --- Volume group ---
 VG Name              vg_u01
 System ID            
 Format               lvm2
 Metadata Areas       1
 Metadata Sequence No 1
 VG Access            read/write
 VG Status            resizable
 MAX LV               0
 Cur LV               0
 Open LV              0
 Max PV               0
 Cur PV               1
 Act PV               1
 VG Size              <12.00 GiB
 PE Size              4.00 MiB
 Total PE             3071
 Alloc PE / Size      0 / 0  
 Free PE / Size      3071 / <12.00 GiB
 VG UUID              c93T67-gZXF-CMSW-1b7u-3ZBt-x3P3-F9dIGP

Now, when I try to create the lvol, I get this:

[[email protected] ~]# lvcreate --size 12G vg_u01
 Volume group "vg_u01" has insufficient free space (3071 extents): 3072 required.

So what should I be applying for the size? How does the math work out on this?

Avi Miller-Oracle

I generally just use -l 100%FREE to specify "all available free space". But you can see that the output states that GiB is available, so trying to create something at 12 GiB isn't going to work.

The LVM metadata and partition table eat into the 12 GB virtual disk. It's also probably a mismatch of specificity, i.e. gigabytes (GB) used by VirtualBox vs Gibibytes (GiB) used by LVM.

Avi Miller-Oracle

I generally just use -l 100%FREE to specify "all available free space". But you can see that the output states that GiB is available, so trying to create something at 12 GiB isn't going to work.

The LVM metadata and partition table eat into the 12 GB virtual disk. It's also probably a mismatch of specificity, i.e. gigabytes (GB) used by VirtualBox vs Gibibytes (GiB) used by LVM.

EdStevens

Got it. Thanks again.