Dan Roberts on 30 Aug 2007 16:21:40 -0000


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Re: [PLUG] How to break a software RAID mirror?


Hello All
Thanks for the help!
I am running fedora core>>
[droberts@kayak /proc]$ uname -a ; 
Linux kayak 2.6.12-1.1381_FC3smp #1 SMP Fri Oct 21 04:03:26 EDT 2005
i686 i686 i386 GNU/Linux

cat /proc/mdstat

Personalities : [raid0] [raid1]
md4 : active raid1 sdb2[1] sda2[0]
      25599488 blocks [2/2] [UU]

md2 : active raid1 sdb3[1] sda3[0]
      5116608 blocks [2/2] [UU]

md3 : active raid1 sdb5[1] sda5[0]
      5116544 blocks [2/2] [UU]

md1 : active raid0 sdb6[1] sda6[0]
      8192896 blocks 64k chunks

md5 : active raid1 sdb7[1] sda7[0]
      29704064 blocks [2/2] [UU]

md0 : active raid1 sdb1[1] sda1[0]
      2048192 blocks [2/2] [UU]

unused devices: <none>
[droberts@kayak /proc]$

So it seems that I am running a mix oF RAID0 and RAID1 on these two disk
RAIDED sets..


The following is how they are mounted on my system when in use..
Filesystem            Size  Used Avail Use% Mounted on
/dev/md0              2.0G  374M  1.5G  21% /
/dev/md5               28G   33M   27G   1% /home2
none                 1004M     0 1004M   0% /dev/shm
/dev/md3              4.9G   34M  4.6G   1% /tmp
/dev/md4               25G  3.2G   20G  15% /usr
/dev/md2              4.9G  190M  4.4G   5% /var
/dev/sdc2              20G  9.8G  8.6G  54% /mnt


What would you recommend I do at this point to detach sda from sdb so
that I could use disk #2 while still having data preserved on disk#1?
Remeber that I can still boot my system on disk#3 which isn't RAIDED to
anyone..
Thanks for any advice!
Dan



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