How To
Summary
How to add another DASD disk to LVM and resize a btrfs filesystem onto it.
Steps
We assume the disk has already been made available to the system.
First, we need to partition it so LVM can use the partition.
Remember under z the entire DASD cannot be used as-is, so typically we make one large partition that spans the DASD.
zlinux:~ # lsdasd
Bus-ID Status Name Device Type BlkSz Size Blocks
==============================================================================
0.0.f60b active dasda 94:0 ECKD 4096 7043MB 1803060
0.0.f60c active dasdb 94:4 ECKD 4096 7043MB 1803060
0.0.f61c active dasdc 94:8 ECKD 4096 7043MB 1803060
Bus-ID Status Name Device Type BlkSz Size Blocks
==============================================================================
0.0.f60b active dasda 94:0 ECKD 4096 7043MB 1803060
0.0.f60c active dasdb 94:4 ECKD 4096 7043MB 1803060
0.0.f61c active dasdc 94:8 ECKD 4096 7043MB 1803060
dasdc is the new one we've added
zlinux:~ # vgs
VG #PV #LV #SN Attr VSize VFree
rootvg 2 1 0 wz--n- 12.59g 8.00m
VG #PV #LV #SN Attr VSize VFree
rootvg 2 1 0 wz--n- 12.59g 8.00m
zlinux:~ # pvs
PV VG Fmt Attr PSize PFree
/dev/dasda3 rootvg lvm2 a-- 5.71g 8.00m
/dev/dasdb1 rootvg lvm2 a-- 6.88g 0
PV VG Fmt Attr PSize PFree
/dev/dasda3 rootvg lvm2 a-- 5.71g 8.00m
/dev/dasdb1 rootvg lvm2 a-- 6.88g 0
Add a partition to the DASD:
zlinux:~ # fdasd -a /dev/dasdc
reading volume label ..: VOL1
reading vtoc ..........: ok
reading volume label ..: VOL1
reading vtoc ..........: ok
auto-creating one partition for the whole disk...
writing volume label...
writing VTOC...
rereading partition table...
writing volume label...
writing VTOC...
rereading partition table...
Add the partition dasdc1 to the LVM disk list:
zlinux:~ # pvcreate /dev/dasdc1
Physical volume "/dev/dasdc1" successfully created
Physical volume "/dev/dasdc1" successfully created
zlinux:~ # pvs
PV VG Fmt Attr PSize PFree
/dev/dasda3 rootvg lvm2 a-- 5.71g 8.00m
/dev/dasdb1 rootvg lvm2 a-- 6.88g 0
/dev/dasdc1 lvm2 --- 6.88g 6.88g
PV VG Fmt Attr PSize PFree
/dev/dasda3 rootvg lvm2 a-- 5.71g 8.00m
/dev/dasdb1 rootvg lvm2 a-- 6.88g 0
/dev/dasdc1 lvm2 --- 6.88g 6.88g
Now add that pv to rootvg:
zlinux:~ # vgextend rootvg /dev/dasdc1
Volume group "rootvg" successfully extended
Volume group "rootvg" successfully extended
zlinux:~ # vgs
VG #PV #LV #SN Attr VSize VFree
rootvg 3 1 0 wz--n- 19.46g 6.88g
VG #PV #LV #SN Attr VSize VFree
rootvg 3 1 0 wz--n- 19.46g 6.88g
Notice PV count is now 3
zlinux:~ # pvs
PV VG Fmt Attr PSize PFree
/dev/dasda3 rootvg lvm2 a-- 5.71g 8.00m
/dev/dasdb1 rootvg lvm2 a-- 6.88g 0
/dev/dasdc1 rootvg lvm2 a-- 6.88g 6.88g
PV VG Fmt Attr PSize PFree
/dev/dasda3 rootvg lvm2 a-- 5.71g 8.00m
/dev/dasdb1 rootvg lvm2 a-- 6.88g 0
/dev/dasdc1 rootvg lvm2 a-- 6.88g 6.88g
Now grow the logical volume. I think you can specifically say to grow it onto dasdc1 but we’ll let LVM handle that detail:
zlinux:~ # lvextend /dev/rootvg/rootfs -L +2G
Size of logical volume rootvg/rootfs changed from 12.58 GiB (3221 extents) to 14.58 GiB (3733 extents).
Logical volume rootfs successfully resized
Size of logical volume rootvg/rootfs changed from 12.58 GiB (3221 extents) to 14.58 GiB (3733 extents).
Logical volume rootfs successfully resized
zlinux:~ # btrfs filesystem resize max /
Resize '/' of 'max'
Resize '/' of 'max'
zlinux:/ # df -h .
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rootvg-rootfs 15G 13G 2.3G 85% /
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/rootvg-rootfs 15G 13G 2.3G 85% /
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Document Information
Modified date:
01 April 2021
UID
ibm10967709