The never-ending upgrade: RAID problem/question

[warlord at MIT.EDU (Derek Atkins)]

You need to manually re-add the (new/replacement) drive back into
the raid set.  Effectively you need to hotadd the new partitions.
man raidhotadd

-derek

Quoting Don Levey <lug at the-leveys.us>:

> I won't bore you all with the full story of this weekend's upgrade of my
> home server; that's a tale for more time and more beer.  Some may recall
> that I had a partition on my mail hard drive fry, and I solicited advice
> about the upgrade.  Much of this centered around RAID.
>
> Well, I already had two RAID-1 partitions on two other drives on the
> machine, md0 and md1.  Everything is working now, but... apparently, the
> /dev/hdb drive has dropped out of the config (leaving only /dev/hdc).  I can
> access it via fdisk, so I know it's there and being read.  But doing a cat
> of /proc/mdstat gives me:
>
> 	[don at davinci ~]$ cat /proc/mdstat
> 	Personalities : [raid1]
> 	md1 : active raid1 hdc2[0]
> 	      35840768 blocks [2/1] [U_]
>
> 	md2 : active raid1 hdd1[1] hda1[0]
> 	      497856 blocks [2/2] [UU]
>
> 	md3 : active raid1 hdd2[1] hda2[0]
> 	      34186240 blocks [2/2] [UU]
>
> 	md4 : active raid1 hdd3[1] hda3[0]
> 	      24418688 blocks [2/2] [UU]
>
> 	md5 : active raid1 hdd5[1] hda5[0]
> 	      94735168 blocks [2/2] [UU]
>
> 	md6 : active raid1 hdd6[1] hda6[0]
> 	      2449792 blocks [2/2] [UU]
>
> 	md0 : active raid1 hdc1[0]
> 	      81377024 blocks [2/1] [U_]
>
> 	unused devices: <none>
>
> As you can see, the two original RAID partitions only contain hdc.  So...
> what should I look at, what should I do, to make this whole again?  As I
> mentioned, things *are* working now, but as the redundancy is why I mirrored
> those drives in the first place (the whole music collection, as well as all
> the photos of the kids) I'd kinda like to get that back.
>
> Thanks for your help,
> -Don
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-- 
       Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
       Member, MIT Student Information Processing Board  (SIPB)
       URL: http://web.mit.edu/warlord/    PP-ASEL-IA     N1NWH
       warlord at MIT.EDU                        PGP key available