Re: [opensuse] raid question

On Friday 22 June 2007 17:40, Lorenzo Cerini wrote:
Hi all,
i have a little trouble with a software raid1 array.
i built it with opensuse10.0.

Now one disks left the array giving me the (F) of failure for one
partition. here is the cat /proc/mdstat:

Personalities : [raid1]
md1 : active raid1 sda3[0]
129017920 blocks [2/1] [U_]

md0 : active raid1 sdb1[2](F) sda1[0]
26217984 blocks [2/1] [U_]

I ma quite far from this server location, so i need to know:
how much fair is to assume disks is not broker and just use 'badblocks -f'?

and if i want to replace it which is the easiest way ?
i partition here the new disk (maybe with fdisk, but do not know the
way to have the disk raid formatted with id=fd), replace the old one,
and then use raidhotadd, or, if the new disk will get anyway the /dev/sdb
identifier, the kernel will do it for me at boot time.

Hello Lorenzo,
It seems like your raid arrays are in a pretty bad state.
/dev/md1 is broken, and /dev/md0 is too.

Here's a suggestion on how to troubleshoot it:
1. If you have some important data on that server, back it up first to a safe
location other than the above mentioned server. Using scp, rsync, anything.
2. You can try to build the array one by one:
For /dev/md1:
mdadm /dev/md1 -a /dev/sdb3 (assuming the broken pair is sdb3)

For /dev/md0:
Remove the F member first:
mdadm /dev/md0 -r /dev/sdb1
Add it again:
mdadm /dev/md0 -a /dev/sdb1

For preparing the new disk, please take note the current partition scheme from
the server, fdisk -l /dev/sda, fdisk -l /dev/sdb. You must make the partition
on the new disk EXACTLY like the real one.
Then partition Using fdisk, for example sdb:
fdisk /dev/sdb
n (new)
primary partition (1-4)
First cylinder: (just enter)
Last cylinder: +1000M (1GB)
Repeat for other partitions.

Then, change the type of the partition as software raid:
t
L (for list of codes)
fd (software raid)
Repeat for other partitions

w (save)

--------------
I have the following note for the actual menu, attached as text file,
hopefully it can go through the list.

Remember, backup your data first! Keep save.
HTH,
--
Fajar Priyanto | Reg'd Linux User #327841 | Linux tutorial
http://linux2.arinet.org
6:23pm up 5:51, 2.6.18.2-34-default GNU/Linux
Let's use OpenOffice. http://www.openoffice.org
[root@server1 ~]# fdisk /dev/hda

The number of cylinders for this disk is set to 4865.
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): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)

Command (m for help): p

Disk /dev/hda: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 2 16033+ 83 Linux
/dev/hda2 3 1177 9438187+ 83 Linux
/dev/hda3 1178 1488 2498107+ 83 Linux
/dev/hda4 1489 4865 27125752+ 5 Extended
/dev/hda5 1489 1814 2618563+ 83 Linux
/dev/hda6 1815 1945 1052226 83 Linux
/dev/hda7 1946 2059 915673+ 82 Linux swap
/dev/hda8 2060 2075 128488+ 83 Linux
/dev/hda9 2076 2792 5759271 83 Linux
/dev/hda10 2793 3002 1686793+ 83 Linux
/dev/hda11 3003 4829 14675346 83 Linux
/dev/hda12 4830 4832 24066 83 Linux

Command (m for help): v
539838 unallocated sectors

Command (m for help): n
First cylinder (4833-4865, default 4833):
Using default value 4833
Last cylinder or +size or +sizeM or +sizeK (4833-4865, default 4865): +50M

Command (m for help): p

Disk /dev/hda: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 2 16033+ 83 Linux
/dev/hda2 3 1177 9438187+ 83 Linux
/dev/hda3 1178 1488 2498107+ 83 Linux
/dev/hda4 1489 4865 27125752+ 5 Extended
/dev/hda5 1489 1814 2618563+ 83 Linux
/dev/hda6 1815 1945 1052226 83 Linux
/dev/hda7 1946 2059 915673+ 82 Linux swap
/dev/hda8 2060 2075 128488+ 83 Linux
/dev/hda9 2076 2792 5759271 83 Linux
/dev/hda10 2793 3002 1686793+ 83 Linux
/dev/hda11 3003 4829 14675346 83 Linux
/dev/hda12 4830 4832 24066 83 Linux
/dev/hda13 4833 4839 56196 83 Linux

Command (m for help): n
First cylinder (4840-4865, default 4840):
Using default value 4840
Last cylinder or +size or +sizeM or +sizeK (4840-4865, default 4865): +50M

Command (m for help): p

Disk /dev/hda: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 2 16033+ 83 Linux
/dev/hda2 3 1177 9438187+ 83 Linux
/dev/hda3 1178 1488 2498107+ 83 Linux
/dev/hda4 1489 4865 27125752+ 5 Extended
/dev/hda5 1489 1814 2618563+ 83 Linux
/dev/hda6 1815 1945 1052226 83 Linux
/dev/hda7 1946 2059 915673+ 82 Linux swap
/dev/hda8 2060 2075 128488+ 83 Linux
/dev/hda9 2076 2792 5759271 83 Linux
/dev/hda10 2793 3002 1686793+ 83 Linux
/dev/hda11 3003 4829 14675346 83 Linux
/dev/hda12 4830 4832 24066 83 Linux
/dev/hda13 4833 4839 56196 83 Linux
/dev/hda14 4840 4846 56196 83 Linux

Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)

Command (m for help): t
Partition number (1-14): 13
Hex code (type L to list codes): L

0 Empty 1e Hidden W95 FAT1 75 PC/IX be Solaris boot
1 FAT12 24 NEC DOS 80 Old Minix bf Solaris
2 XENIX root 39 Plan 9 81 Minix / old Lin c1 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 82 Linux swap c4 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 83 Linux c6 DRDOS/sec (FAT-
5 Extended 41 PPC PReP Boot 84 OS/2 hidden C: c7 Syrinx
6 FAT16 42 SFS 85 Linux extended da Non-FS data
7 HPFS/NTFS 4d QNX4.x 86 NTFS volume set db CP/M / CTOS / .
8 AIX 4e QNX4.x 2nd part 87 NTFS volume set de Dell Utility
9 AIX bootable 4f QNX4.x 3rd part 8e Linux LVM df BootIt
a OS/2 Boot Manag 50 OnTrack DM 93 Amoeba e1 DOS access
b W95 FAT32 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O
c W95 FAT32 (LBA) 52 CP/M 9f BSD/OS e4 SpeedStor
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs
f W95 Ext'd (LBA) 54 OnTrackDM6 a5 FreeBSD ee EFI GPT
10 OPUS 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12/16/
11 Hidden FAT12 56 Golden Bow a7 NeXTSTEP f0 Linux/PA-RISC b
12 Compaq diagnost 5c Priam Edisk a8 Darwin UFS f1 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor a9 NetBSD f4 SpeedStor
16 Hidden FAT16 63 GNU HURD or Sys ab Darwin boot f2 DOS secondary
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fd Linux raid auto
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fe LANstep
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid ff BBT
1c Hidden W95 FAT3
Hex code (type L to list codes): fd
Changed system type of partition 13 to fd (Linux raid autodetect)

Command (m for help): p

Disk /dev/hda: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 2 16033+ 83 Linux
/dev/hda2 3 1177 9438187+ 83 Linux
/dev/hda3 1178 1488 2498107+ 83 Linux
/dev/hda4 1489 4865 27125752+ 5 Extended
/dev/hda5 1489 1814 2618563+ 83 Linux
/dev/hda6 1815 1945 1052226 83 Linux
/dev/hda7 1946 2059 915673+ 82 Linux swap
/dev/hda8 2060 2075 128488+ 83 Linux
/dev/hda9 2076 2792 5759271 83 Linux
/dev/hda10 2793 3002 1686793+ 83 Linux
/dev/hda11 3003 4829 14675346 83 Linux
/dev/hda12 4830 4832 24066 83 Linux
/dev/hda13 4833 4839 56196 fd Linux raid autodetect
/dev/hda14 4840 4846 56196 83 Linux

Command (m for help):
Command (m for help): t
Partition number (1-14): 14
Hex code (type L to list codes): fd
Changed system type of partition 14 to fd (Linux raid autodetect)

Command (m for help): p

Disk /dev/hda: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 2 16033+ 83 Linux
/dev/hda2 3 1177 9438187+ 83 Linux
/dev/hda3 1178 1488 2498107+ 83 Linux
/dev/hda4 1489 4865 27125752+ 5 Extended
/dev/hda5 1489 1814 2618563+ 83 Linux
/dev/hda6 1815 1945 1052226 83 Linux
/dev/hda7 1946 2059 915673+ 82 Linux swap
/dev/hda8 2060 2075 128488+ 83 Linux
/dev/hda9 2076 2792 5759271 83 Linux
/dev/hda10 2793 3002 1686793+ 83 Linux
/dev/hda11 3003 4829 14675346 83 Linux
/dev/hda12 4830 4832 24066 83 Linux
/dev/hda13 4833 4839 56196 fd Linux raid autodetect
/dev/hda14 4840 4846 56196 fd Linux raid autodetect

Command (m for help): w

The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table.
The new table will be used at the next reboot.
Syncing disks.
[root@server1 ~]# cat /proc/partitions
major minor #blocks name

3 0 39082680 hda
3 1 16033 hda1
3 2 9438187 hda2
3 3 2498107 hda3
3 4 1 hda4
3 5 2618563 hda5
3 6 1052226 hda6
3 7 915673 hda7
3 8 128488 hda8
3 9 5759271 hda9
3 10 1686793 hda10
3 11 14675346 hda11
3 12 24066 hda12
[root@server1 ~]# fdisk -l

Disk /dev/hda: 40.0 GB, 40020664320 bytes
255 heads, 63 sectors/track, 4865 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 2 16033+ 83 Linux
/dev/hda2 3 1177 9438187+ 83 Linux
/dev/hda3 1178 1488 2498107+ 83 Linux
/dev/hda4 1489 4865 27125752+ 5 Extended
/dev/hda5 1489 1814 2618563+ 83 Linux
/dev/hda6 1815 1945 1052226 83 Linux
/dev/hda7 1946 2059 915673+ 82 Linux swap
/dev/hda8 2060 2075 128488+ 83 Linux
/dev/hda9 2076 2792 5759271 83 Linux
/dev/hda10 2793 3002 1686793+ 83 Linux
/dev/hda11 3003 4829 14675346 83 Linux
/dev/hda12 4830 4832 24066 83 Linux
/dev/hda13 4833 4839 56196 fd Linux raid autodetect
/dev/hda14 4840 4846 56196 fd Linux raid autodetect
[root@server1 ~]# partprobe
[root@server1 ~]# cat /proc/partitions
major minor #blocks name

3 0 39082680 hda
3 1 16033 hda1
3 2 9438187 hda2
3 3 2498107 hda3
3 5 2618563 hda5
3 6 1052226 hda6
3 7 915673 hda7
3 8 128488 hda8
3 9 5759271 hda9
3 10 1686793 hda10
3 11 14675346 hda11
3 12 24066 hda12
3 13 56196 hda13
3 14 56196 hda14

Attachment: pgpQjl6TvKo9s.pgp
Description: PGP signature

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