Gentoo Archives: gentoo-user

From: Volker Armin Hemmann <volkerarmin@××××××××××.com>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] How to get raid
Date: Sat, 07 Jan 2012 18:52:04
Message-Id: 4453289.h088Sfp3zX@localhost
In Reply to: Re: [gentoo-user] How to get raid by Jeff Cranmer
1 Am Samstag, 7. Januar 2012, 13:27:04 schrieb Jeff Cranmer:
2 > > > I tried changing the type of each array element in fdisk to fd (linux
3 > > > raid autodetect.
4 > > >
5 > > > The array is still not being recognised at boot, with the same 'cannot
6 > > > read superblock' error.
7 > > >
8 > > > I also tried re-running mdadm --create /dev/md0 --level=5
9 > > > --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1
10 > > > I get the error
11 > > > mdadm: device /dev/sdb1 not suitable for any style of array.
12 > > >
13 > > > What is going on here?
14 > >
15 > > I am thinking ;)
16 >
17 > LOL!
18 >
19 > Me too.
20 >
21 > mdadm --detail /dev/md0 thinks that /dev/sdc1 is faulty.
22 > I'm not sure whether it's really faulty, or just that my setup for RAID
23 > is screwed up.
24 >
25 > How do I get rid of an existing /dev/md0?
26
27 you stop it. Override the superblock with dd.. and lose all data on the disks.
28
29
30 >
31 > I'm thinking that I can try creating a RAID1 array using the two
32 > allegedly good disks and see if I can make that work.
33
34 yeah
35
36 >
37 > If that works, I'll get rid of it and try recreating the RAID1 with one
38 > good disk and the one that mdadm thinks is faulty.
39 >
40
41 you don't have to. You can migrate a 2 disk raid1 to a 3 disk raid5. Howtos
42 are availble via google.
43
44
45 just saying - box in suspend to ram. I change the cable (and connector on
46 mobo) on a disk with two raid 1 partitions on it.
47
48 One came back after starting the box.
49
50 The other? Nothing I tried worked. At the end I dd'ed the partition.. and did
51 a complete 'faulty disk/replacement' resync....
52
53 argl.
54
55
56 --
57 #163933

Replies

Subject Author
Re: [gentoo-user] How to get raid Jeff Cranmer <jeff@××××××××××××××.com>
Re: [gentoo-user] How to get raid Jeff Cranmer <jeff@××××××××××××××.com>