Theo
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06-16-2008, 01:02 PM
"drew einhorn"
mdadm on reboot
On Mon, Jun 16, 2008 at 12:09 AM, Les Mikesell <lesmikesell@gmail.com> wrote:
drew einhorn wrote:
Hi,
I'm in the process of trying mdadm for the first time
I've been trying stuff out of tutorials, etc.
At this point I know how to create stripes, and mirrors.
My stripe is automatically restarting on reboot,
but the degraded mirror isn't.
Is the partition type set to FD?
That's the problem, but now I'm having trouble fixing it.
md1 has a single partitions** md1p1
[drew@funGus ~]$ sudo fdisk /dev/md1
The number of cylinders for this disk is set to 244123680.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
** (e.g., DOS FDISK, OS/2 FDISK)
Command (m for help): p
Disk /dev/md1: 999.9 GB, 999930593280 bytes
2 heads, 4 sectors/track, 244123680 cylinders
Units = cylinders of 8 * 512 = 4096 bytes
*** Device Boot***** Start******** End***** Blocks** Id* System
/dev/md1p1************** 1** 244123680** 976494718** fd* Linux raid autodetect
mdadm: Cannot open /dev/md1p1: No such file or directory
mdadm: create aborted
[drew@funGus ~]$ sudo mdadm -C -ayes /dev/md2 --level=raid1 --raid-devices=2* missing /dev/md1p1
mdadm: Cannot open /dev/md1p1: No such file or directory
mdadm: create aborted
Hmm.* That's right.* I does not exist.
[drew@funGus dev]$ ls -l /dev/md*
brw-r----- 1 root disk 9, 0 Jun 16 06:43 /dev/md0
brw-r----- 1 root disk 9, 1 Jun 16 06:46 /dev/md1
brw-r----- 1 root disk 9, 2 Jun 16 06:48 /dev/md2
[drew@funGus dev]$
*
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--
Drew Einhorn
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06-16-2008, 02:03 PM
Stephen Harris
mdadm on reboot
On Mon, Jun 16, 2008 at 07:02:17AM -0600, drew einhorn wrote:
> On Mon, Jun 16, 2008 at 12:09 AM, Les Mikesell <lesmikesell@gmail.com>
> > Is the partition type set to FD?
> >
> >
> That's the problem, but now I'm having trouble fixing it.
>
> md1 has a single partitions md1p1
>
> [drew@funGus ~]$ sudo fdisk /dev/md1
No; you need to set the partition type of the underlying physical partitions
on /dev/sda or wheverever your data really lives. This is what is
picked up
eg on my machine I have 4 disks in a RAID5 thus:
md3 : active raid5 sdd4[3] sdc3[2] sdb2[1] sda1[0]
1465151808 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]
So the raw partitions are sda1 sdb2 sdc3 sdd4
If I look at sda:
# fdisk -l /dev/sda
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 60801 488384001 fd Linux raid autodetect
That's where the "fd" needs to be.
--
rgds
Stephen
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mdadm on reboot
