Expanding existing lun space using multipath and lvm

The storage team extended an existing lun. (mpath6) I am able to see the space 300G via multpath. I am unable to get lvm to see the space. I have added a second partition to dm-3. but pvresize is not picking it up.

What am I missing? Is there a way to extend the existing partition without risking the data?

mpath6 (360a98000572d4f38466f5732472d5a4d) dm-3 NETAPP,LUN
size=300G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=50 status=active
| |- 2:0:3:7 sdbk 67:224 active ready running
| |- 2:0:2:7 sdbc 67:96 active ready running
| |- 1:0:3:7 sdae 65:224 active ready running
| `- 1:0:2:7 sdw 65:96 active ready running
`-+- policy='round-robin 0' prio=10 status=enabled
|- 2:0:1:7 sdau 66:224 active ready running
|- 2:0:0:7 sdam 66:96 active ready running
|- 1:0:1:7 sdo 8:224 active ready running
`- 1:0:0:7 sdg 8:96 active ready running

--- Physical volume ---
PV Name /dev/mpath/mpath6p1
VG Name sanvg6
PV Size 200.00 GB / not usable 1.15 MB
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 51199
Free PE 0
Allocated PE 51199
PV UUID gji02f-VErW-jNva-b1xQ-HXMw-zcz1-jPsMtV


[root@hqlinnmnpdbt ~]# fdisk -l /dev/dm-3

Disk /dev/dm-3: 322.1 GB, 322122547200 bytes
255 heads, 63 sectors/track, 39162 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/dm-3p1 1 26108 209712478+ 8e Linux LVM
/dev/dm-3p2 26109 39162 104856255 8e Linux LVM
[root@hqlinnmnpdbt ~]#
[root@hqlinnmnpdbt ~]# pvresize /dev/mpath/mpath6p1
Physical volume "/dev/mpath/mpath6p1" changed
1 physical volume(s) resized / 0 physical volume(s) not resized
[root@hqlinnmnpdbt ~]# pvdisplay /dev/mpath/mpath6p1
--- Physical volume ---
PV Name /dev/mpath/mpath6p1
VG Name sanvg6
PV Size 200.00 GB / not usable 1.15 MB
Allocatable yes (but full)
PE Size (KByte) 4096
Total PE 51199
Free PE 0
Allocated PE 51199
PV UUID gji02f-VErW-jNva-b1xQ-HXMw-zcz1-jPsMtV

Your physical volume is created on the first partition on the disk. disk=mpath6 partition=mpath6p1. Although the lun has grown, the partition is still the same size. You will need to grow the partition to use the extra space on the disk.

Yes, That is why I created the 2nd partition... How do I expand the first partition without corruption or risk of data loss of the existing dsta on the first partition? Also this is a live running system - I would like to expand without shutting it down.

You're on the right track. I too don't like the idea of deleting an existing partition and re-creating it.

Assuming your second partition is /dev/mpath/mpath6p2 with partition type 8e (Linux LVM)

If you don't see it under /dev/mpath/ yet:

# start_udev

Then:

# vgextend /dev/<VG> /dev/mpath/mpath6p2

# vgdisplay -v <VG> (will now show new space, increased total extents, and mpath6p2)

# lvextend -l <extents> --resizefs /dev/<VG>/<LV>

... and Bob's yer uncle.