I have a system with 4 disk drives, two 512 Gb and two 1 Tb.
It look like this:
CentOS release 5.9 (Final)
Disk /dev/sda: 500.1 GB, 500107862016 bytes
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
Disk /dev/sdc: 500.1 GB, 500107862016 bytes
Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
=================================================================
Disk /dev/sda: 500.1 GB, 500107862016 bytes
16 heads, 63 sectors/track, 969021 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 1985 1000408+ fd Linux raid autodetect
/dev/sda2 1986 9923 4000752 82 Linux swap / Solaris
/dev/sda3 9924 969021 483385392 fd Linux raid autodetect
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 125 1004031 fd Linux raid autodetect
/dev/sdb2 126 624 4008217+ 82 Linux swap / Solaris
/dev/sdb3 625 121601 971747752+ fd Linux raid autodetect
Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdc1 * 1 125 1004031 fd Linux raid autodetect
/dev/sdc2 126 4096 31897057+ 82 Linux swap / Solaris
/dev/sdc3 4097 60801 455482912+ fd Linux raid autodetect
Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdd1 * 1 125 1004031 fd Linux raid autodetect
/dev/sdd2 126 624 4008217+ 82 Linux swap / Solaris
/dev/sdd3 625 121601 971747752+ fd Linux raid autodetect
The four 1 GB partitions (sd[abcd]1) are configured as a RAID 1 array with a single ext4
filesystem mounted as /boot.
Swap is Swap...
the two smaller drives (sd[ac]3) partitions are configured as a RAID 1 array containing an LVM
physical volume (md1). the two larger drives (sd[bd]3) are configured as a RAID 1 array
containing an LVM physical volume (md2).
# pvdisplay
--- Physical volume ---
PV Name /dev/md1
VG Name vg0
PV Size 434.38 GB / not usable 7.44 MB
Allocatable yes
PE Size (KByte) 32768
Total PE 13900
Free PE 7810
Allocated PE 6090
PV UUID z5QGpO-6bKP-k8xm-vUha-CWYj-dkjG-UaHAE5
--- Physical volume ---
PV Name /dev/md2
VG Name vg0
PV Size 926.73 GB / not usable 12.31 MB
Allocatable yes (but full)
PE Size (KByte) 32768
Total PE 29655
Free PE 0
Allocated PE 29655
PV UUID RIliNF-SENU-O2S9-Qo4H-rtOC-2Yzr-7jzuB0
The two physical volumes are defined as a single volume group.
# vgdisplay
--- Volume group ---
VG Name vg0
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 17
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 10
Open LV 10
Max PV 0
Cur PV 2
Act PV 2
VG Size 1.33 TB
PE Size 32.00 MB
Total PE 43555
Alloc PE / Size 35745 / 1.09 TB
Free PE / Size 7810 / 244.06 GB
VG UUID dKKD3L-pcHy-F8KQ-6qNX-vFye-tXdv-6Qs98W
One of the 512 Gb drives is failing. What I want to do is to replace the
two 512 Gb drives with 3 Tb drives, expand the RAID array on them and then
expand the LVM PV contained therein. This much I can do.
I then want to move all of the date from the other PV into this one, and remove
the second PV, RAID array, and the two 1 Tb drives, leaving me with two 3 Tb
drves, a large RAID array and a single PV containing everything (except the /boot
and SWAP partitions.)
What I'm not sure about is how to move the date from the second PV to the
first so I can then delete the contents of the drive and physically remove them
from the system leaving me with only the two 3 Tb drives.
Help!
Thanks
Harold