On Sep 13, 2001 14:11 -0600, Diehl, Jeffrey wrote:
> I seem to be missing 100Gb out of a possible 300Gb! Check it out:
>
> [root@filmore jdiehl]# fdisk -l | grep LVM
> /dev/sdb5 226 4402 33551721 8e Linux LVM
> /dev/sdb6 4403 8579 33551721 8e Linux LVM
> /dev/sdb7 8580 12756 33551721 8e Linux LVM
> /dev/sdb8 12757 15030 18265873+ 8e Linux LVM
> /dev/sdc6 7015 14028 56339923+ 8e Linux LVM
> /dev/sdc7 14029 21042 56339923+ 8e Linux LVM
> /dev/sdc8 21043 28056 56339923+ 8e Linux LVM
> /dev/sdc9 28057 30945 23205861 8e Linux LVM
> [root@filmore jdiehl]#
>
> Adding this space up, I get 311Gb.
But it is only 296 GiB, which is what LVM measures.
> [root@filmore jdiehl]# lvdisplay /dev/Database2/data
> --- Logical volume ---
> LV Name /dev/Database2/data
> VG Name Database2
> LV Write Access read/write
> LV Status available
> LV # 1
> # open 1
> LV Size 215.3 GB
> Current LE 27558
> Allocated LE 27558
> Allocation next free
> Read ahead sectors 120
> Block device 58:0
>
> Here we see that I only have access to 215Gb.
What PE size are you using? If (default) 4MiB, you would lose about 3MiB
per PV, so 3MiB * 8 = 24MiB. If you are using LVM 1.0+ user tools you will
lose 1.5x PE size (on average) per PV, so if you have 32MiB PEs, you lose
48MiB * 8 = 384MiB. So this is still not enough to explain your losses.
Are you sure you have added all PVs into this VG, and used all of the PEs
in this LV? Something like pvscan would show better information.
Cheers, Andreas
--
Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto,
\ would they cancel out, leaving him still hungry?"
http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert
