https://community.hpe.com/t5/operating-system-linux/lvm-question/m-p/5119983#M62316 Thanks. Thu, 17 Jul 2008 15:24:27 GMT Notts_sys 2008-07-17T15:24:27Z https://community.hpe.com/t5/operating-system-linux/lvm-question/m-p/5119981#M62314 Dear All,<BR /><BR />We are having this issue with LVM and it looks like we are not able to see full capacity of LUNs presented to the server.<BR /><BR />We presented 2 X 2 TB of Luns to this box (sda and sdb), then created partitions sda1 and sdb1 of 2TB capacity each and added them to the volume group. Volume Group info as below. From the display below, we can see that the disks /dev/sda1 and /dev/sda2 both have 476835 PE so around 2TB, thats fine. The VG has total PE of 953670, fine too. but then why the VG Size is only 3.64 TB. As per my calculation it should be 953670 x 4.00 MB = 3814680 (3.8 TB), i wonder why it only shows 3.64 TB ? Please comment.<BR /><BR />The system in question is openSUSE 10.2 (i586), LVM: lvm2-2.02.13-10.2<BR /><BR /><BR /><BR />#vgdisplay -v vgBackup | more<BR /> Using volume group(s) on command line<BR /> Finding volume group "vgBackup"<BR /> --- Volume group ---<BR /> VG Name vgBackup<BR /> System ID<BR /> Format lvm2<BR /> Metadata Areas 2<BR /> Metadata Sequence No 5<BR /> VG Access read/write<BR /> VG Status resizable<BR /> MAX LV 0<BR /> Cur LV 1<BR /> Open LV 1<BR /> Max PV 0<BR /> Cur PV 2<BR /> Act PV 2<BR /> VG Size 3.64 TB<BR /> PE Size 4.00 MB<BR /> Total PE 953670<BR /> Alloc PE / Size 917504 / 3.50 TB<BR /> Free PE / Size 36166 / 141.27 GB<BR /> VG UUID 05Wqus-mSip-psJr-jsgS-lmck-nbaw-ydu53r<BR /><BR /> --- Logical volume ---<BR /> LV Name /dev/vgBackup/lvBackup<BR /> VG Name vgBackup<BR /> LV UUID nPQPwE-gL8S-igJ1-ClUV-kkQB-aK2q-2auuSu<BR /> LV Write Access read/write<BR /> LV Status available<BR /> # open 1<BR /> LV Size 3.50 TB<BR /> Current LE 917504<BR /> Segments 2<BR /> Allocation inherit<BR /> Read ahead sectors 0<BR /> Block device 253:0<BR /><BR /> --- Physical volumes ---<BR /> PV Name /dev/sdb4<BR /> PV UUID 3C01SL-QVDq-gs2f-K1kk-0gx1-fg3p-hZRfhi<BR /> PV Status allocatable<BR /> Total PE / Free PE 476835 / 0<BR /><BR /> PV Name /dev/sda1<BR /> PV UUID 33Enrm-GI0i-OQew-HcbG-OBZM-Qcin-HZy6Nc<BR /> PV Status allocatable<BR /> Total PE / Free PE 476835 / 36166<BR /> Thu, 17 Jul 2008 14:42:36 GMT https://community.hpe.com/t5/operating-system-linux/lvm-question/m-p/5119981#M62314 Notts_sys 2008-07-17T14:42:36Z https://community.hpe.com/t5/operating-system-linux/lvm-question/m-p/5119982#M62315 Multipliers of 1000 vs. 1024. One of the reasons that "human readable" sizes are often a bad thing for admins.<BR /><BR />953670 extents, 4MB/extent = 3814680MB<BR /><BR />3814680MB, 1024MB/1GB = 3725.27GB<BR /><BR />3725.27GB, 1024GB/1TB = 3.64TB<BR /> Thu, 17 Jul 2008 15:13:29 GMT https://community.hpe.com/t5/operating-system-linux/lvm-question/m-p/5119982#M62315 Heironimus 2008-07-17T15:13:29Z https://community.hpe.com/t5/operating-system-linux/lvm-question/m-p/5119983#M62316 Thanks. Thu, 17 Jul 2008 15:24:27 GMT https://community.hpe.com/t5/operating-system-linux/lvm-question/m-p/5119983#M62316 Notts_sys 2008-07-17T15:24:27Z