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mam k dispozici 4x500GB v RAID 5, abych vyuzil jeste dva starsi disky po 250GB napadlo mne spojit mensi disky pomoci LVM. LVM pak hodit do raidu jako 5.disk => 2TB uloziste.

Sestavit LVM i RAID nebyl problem. Avsak nevim jak (pokud to jde) nastavit lv svazku souborovy typ "LINUX RAID AUTODETECT". V dusledku toho se po rebootu diskove pole spravne nesestavi a LVM svazek v poli chybi:

  53.398750] raid5: device hda7 operational as raid disk 0
[   53.398757] raid5: device hda10 operational as raid disk 4
[   53.398760] raid5: device hda9 operational as raid disk 3
[   53.398763] raid5: device hda8 operational as raid disk 2
[   53.398766] raid5: device hda6 operational as raid disk 1
[   53.399406] raid5: allocated 6286kB for md0
[   53.399410] raid5: raid level 5 set md0 active with 5 out of 6 devices, algorithm 2
[   53.399414] RAID5 conf printout:
[   53.399416]  --- rd:6 wd:5
[   53.399418]  disk 0, o:1, dev:hda7
[   53.399421]  disk 1, o:1, dev:hda6
[   53.399423]  disk 2, o:1, dev:hda8
[   53.399425]  disk 3, o:1, dev:hda9
[   53.399427]  disk 4, o:1, dev:hda10

# mdadm /dev/md0 -a /dev/vg_test/mylv
mdadm: re-added /dev/vg_test/mylv

# cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4]
md0 : active raid5 dm-0[6] hda7[0] hda10[4] hda9[3] hda8[2] hda6[1]
      481280 blocks level 5, 64k chunk, algorithm 2 [6/5] [UUUUU_]
      [====>................]  recovery = 24.2% (24064/96256) finish=1.1min speed=1002K/sec

unused devices: < none >

Napadlo me jeste reseni, kdy bych 500GB disky rozdelil na polovinu a nad vsim sestavil RAID6 z 250GB svazku, pak by mohly vypadnout dva oddily a tudiz jeden disk.

PS: zatim jsem si pro testovani vytvoril 100MB oddily na /dev/hda (proto ty velikosti i stejny disk)

Jak docilit aby se LVM oddil automaticky pridal do RAID?

/etc/raidconf mam prazdny, docetl jsem se ze se jiz nepouziva. pomohlo by doplnit?

Bylo by lepsi drzet se myslenky LVM+RAID5 nebo zvolit RAID6?