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