Temos o SW MD RAID1 em um RHEL5. Os dispositivos RAID vêm de vários caminhos atualmente.
# pvs -v --segments
Scanning for physical volume names
PV VG Fmt Attr PSize PFree Start SSize LV Start Type PE Ranges
/dev/md0 foovg lvm2 a-- 20.00G 0 0 5119 barrootlv 0 linear /dev/md0:0-5118
/dev/md1 foovg lvm2 a-- 20.00G 20.00G 0 5119 0 free
/dev/md12 foovg2 lvm2 a-- 32.00G 0 0 8191 baru03db2lv 0 linear /dev/md12:0-8190
/dev/md13 foovg2 lvm2 a-- 32.00G 15.99G 0 4097 baru03db2lv 8191 linear /dev/md13:0-4096
/dev/md13 foovg2 lvm2 a-- 32.00G 15.99G 4097 4094 0 free
/dev/md14 foobarvg2 lvm2 a-- 32.00G 7.00G 0 6400 baru06foobarelv 0 linear /dev/md14:0-6399
/dev/md14 foobarvg2 lvm2 a-- 32.00G 7.00G 6400 1791 0 free
/dev/md15 foobarvg2 lvm2 a-- 32.00G 32.00G 0 8191 0 free
/dev/md2 foovg lvm2 a-- 20.00G 20.00G 0 5119 0 free
/dev/md24 foovg5 lvm2 a-- 32.00G 6.99G 0 5120 baru10db5lv 0 linear /dev/md24:0-5119
/dev/md24 foovg5 lvm2 a-- 32.00G 6.99G 5120 2 baru10eprinttlv 24574 linear /dev/md24:5120-5121
/dev/md24 foovg5 lvm2 a-- 32.00G 6.99G 5122 1280 baru10db5lv 5120 linear /dev/md24:5122-6401
/dev/md24 foovg5 lvm2 a-- 32.00G 6.99G 6402 1789 0 free
/dev/md27 foobarvg5 lvm2 a-- 64.00G 13.99G 0 12800 baru010archlv 0 linear /dev/md27:0-12799
/dev/md27 foobarvg5 lvm2 a-- 64.00G 13.99G 12800 1 baru10eprfoobarelv 8191 linear /dev/md27:12800-12800
/dev/md27 foobarvg5 lvm2 a-- 64.00G 13.99G 12801 3582 0 free
/dev/md28 foovg6 lvm2 a-- 128.00G 0 0 32767 baru11db6lv 0 linear /dev/md28:0-32766
/dev/md29 foovg6 lvm2 a-- 64.00G 1.99G 0 15873 baru11db6lv 32767 linear /dev/md29:0-15872
/dev/md29 foovg6 lvm2 a-- 64.00G 1.99G 15873 510 0 free
/dev/md30 foobarvg6 lvm2 a-- 32.00G 0 0 8191 baru011archlv 0 linear /dev/md30:0-8190
/dev/md31 foobarvg6 lvm2 a-- 8.00G 0 0 2047 baru011archlv 8191 linear /dev/md31:0-2046
/dev/md5 foovg lvm2 a-- 20.00G 20.00G 0 5119 0 free
/dev/md6 foovg lvm2 a-- 80.00G 80.00G 0 20479 0 free
Pergunta : (apenas um exemplo seria suficiente) como podemos converter esses dispositivos em espelhos LVM online? Para alcançar a mesma funcionalidade, como no RAID1.
Suposição (mas como *? e está tudo bem? Haverá espaço suficiente?):
1. - disassemble one side of the given RAID1 device.
2. - put the disk/partition of the disassembled RAID1 device to the given VG.
3. - move the segments of the remaining side of the given RAID1 to the newly (one of the old side of the raid1) added disk in the VG.
4. - remove the last remaining side in the given raid1 and put it in the VG as mirror.
* quais são os comandos?
Você tem a ideia certa. Os comandos específicos são:
1) mdadm -fr /dev/mdxx /dev/sdXX
2) pvcreate /dev/sdXX e vgextend vgname /dev/sdXX
3) pvmove /dev/mdxx
4) mdadm --stop /dev/mdxx e pvcreate /dev/sdXX (a unidade outra ) e vgextend vgname /dev/sdXX e finalmente lvconvert -m 1 vg/lv para cada lv que você deseja espelhar.