Topic: Some RAID info

[electroman00]

Also for anyone's intrest.....

Raid output of after clean install w/2 30gig drives on 7pre1
Be aware it may take some time to construct / reconstruct the raid array
after clean install.
Don't try to establish the raid right after an install on the console admin with

5.  Manage disk redundancy

Raid array will construct itself in less than an hour (speed of sys) and you
should see
"All RAID devices are in clean state"

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Current RAID status:                                        
 
 Personalities : [raid1]
 md2 : active raid1 hdc2[1] hda2[0]
      29904896 blocks [2/2] [UU]          
 md1 : active raid1 hdc1[1] hda1[0]
         102208 blocks [2/2] [UU]
 
 unused devices: <none>  

     All RAID devices are in clean state


cat /proc/partitions; cat /proc/mdstat

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ARRAY /dev/md1 super-minor=1

major minor  #blocks  name

   3     0   30015216 hda
   3     1     102280 hda1
   3     2   29912904 hda2
  22     0   30015216 hdc
  22     1     104391 hdc1
  22     2   29904997 hdc2
   9     1     102208 md1
   9     2   29904896 md2
 253     0   29327360 dm-0
 253     1     524288 dm-1


Personalities : [raid1]
md2 : active raid1 hdc2[1] hda2[0]
      29904896 blocks [2/2] [UU]

md1 : active raid1 hdc1[1] hda1[0]
      102208 blocks [2/2] [UU]

unused devices: <none>
ARRAY /dev/md1 super-minor=1


A look inside mdadm.conf shows

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# mdadm.conf written out by anaconda
DEVICE partitions
MAILADDR root
ARRAY /dev/md2 super-minor=2
ARRAY /dev/md1 super-minor=1

On the command line a good look at  man mdadm should be in order.

and a look here also
http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html#toc5
http://www.bytepile.com/raid_class.php#02

For CentOS
http://www.openfiler.com/about/

[CharlieBrady]

Also for anyone's intrest.....

It'd be better to put stuff like this into the wiki. This forum post will soon be lost in the dust of history.

[electroman00]

Charlie

Will do.....

What concerned me after the install was md1 block size.

Then it dawned on me after I had already rebooted with iso in drive and
restarted the install again.

I read somewhere it was a good idea to zero out the drives,
however I gave 7pre1 a shot at install with two loaded drives and when it
was finished I thought it screwed it up, but I guess not.

Looks like 7pre1 will blast all drives for the install and do it right, good to know.

I assume the md1 blocks indicates current blocks used by sme and
is then constructed in /dev/array and the md2 blocks are remaining blocks
in that /dev/array.

Really takes some time to understand that little screenie output if it's new to you.