root na SW RAID1 [dlhsie]

[Peter Mann]

On Thu, Oct 23, 2003 at 03:54:46PM +0200, Marian Cavojsky wrote:
> > ale aby som sa vratil k tomu pridaniu tretieho disku ... ak podla daneho
> > postupu oznacime sdc1 ako failed-disk, tak sa nam pri mkraid stratia
> > data z md0 - teda fyzicky z sda1 aj z sdb1 ... a kedze sdc1 je novy
> > disk, tak prakticky pridem o data ... 
> > 
> > zrejme v tom popise chyba nieco take: "skopirujte vsetko potrebne z
> > /dev/md0 na sdc1" - potom by ten dalsi popis sedel, pretoze sdc1 je
> > oznaceny ako failed a po mkraid by sme z neho vlastne mohli skopirovat
> > data
> > 
> > uvazujem spravne? alebo som sa uz do toho privelmi zamotal?
> 
> Poviem len dvojtyzdnove skusenosti. Uz ked je na niektorom disku
> vytvoreny perzistent blok pomocou mkraid. Cize ak uz bol ten disk v RAID
> a su tam udaje, dalsi mkraid nic neznici, len upravy zaznam perzistent
> bloku. Aspon si to tak predstavujem, podla toho ako sa mi to spravalo.
> 
> Cize, nie je mozne urobit mkraid na particiu, ktora este v RAID-e nebola
> bez strary udajov, ale opatovny mkraid na particiu, ktora uz v RAID-e
> bola neskodi, len upravi informacie v hlavicke RAID-u.
> 
> Takto sa mi to spravalo pri mojich pokusoch. Nemienim preberat
> zodpovednost za ziadne stratene udaje, treba zalohovat.

manual hovori o strate dat, ale aj moja skusenost je taka, ze ak robim
mkraid na particiu, ktora uz v RAID-e bola, tak datam to neuskodi:

 mkraid --really-force /dev/md2

 DESTROYING the contents of /dev/md2 in 5 seconds, Ctrl-C if unsure!
 handling MD device /dev/md2
 analyzing super-block
 disk 0: /dev/sda2, 249007kB, raid superblock at 248896kB
 disk 1: /dev/sdb2, 249007kB, raid superblock at 248896kB
 disk 2: /dev/sdc2, failed

hoci pise, ze "DESTROYING", tak udaje tam ostanu ...

DAKUJEM za pripomienky, teraz uz mam uspesne RAID-1 s 3 diskami ;-))

mount
 
/dev/md1 on / type ext3 (rw,errors=remount-ro)
proc on /proc type proc (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/md2 on /tmp type ext3 (rw)
/dev/md5 on /usr type ext3 (rw)
/dev/md6 on /var type ext3 (rw)
/dev/md7 on /home type ext3 (rw)

cat /proc/mdstat

Personalities : [raid1] 
read_ahead 1024 sectors
md1 : active raid1 sdc1[2] sdb1[1] sda1[0]
      248896 blocks [3/3] [UUU]
      
md2 : active raid1 sdc2[2] sdb2[1] sda2[0]
      248896 blocks [3/3] [UUU]
      
md3 : active raid1 sdc3[2] sdb3[1] sda3[0]
      995904 blocks [3/3] [UUU]
      
md5 : active raid1 sdc5[2] sdb5[1] sda5[0]
      995904 blocks [3/3] [UUU]
      
md6 : active raid1 sdc6[2] sdb6[1] sda6[0]
      1999936 blocks [3/3] [UUU]
      
md7 : active raid1 sdc7[2] sdb7[1] sda7[0]
      4465920 blocks [3/3] [UUU]
      
unused devices: <none>

DAKUJEM DAKUJEM DAKUJEM ;-)

-- 

5o   Peter.Mann at tuke.sk
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