RH 7.3 raid1 setup

RH 7.3 raid1 setup

[Christian Schmit]

I installed RH 7.3 on raid1 using the standard
RH 7.3 GUI setup.

Everything installs fine. According to mdstat
raid1 seems to be running fine:

# cat /proc/mdstat 
Personalities : [raid1] 
read_ahead 1024 sectors
md1 : active raid1 hda5[0] hdc5[1]
      3494016 blocks [2/2] [UU]
      
md2 : active raid1 hda3[0] hdc3[1]
      16892224 blocks [2/2] [UU]
      
md3 : active raid1 hda2[0] hdc2[1]
      19454592 blocks [2/2] [UU]
      
md0 : active raid1 hda1[0] hdc1[1]
      361344 blocks [2/2] [UU]
      
unused devices: <none>

However when shutting down the system and 
disconnecting the 1st IDE drive I cannot 
boot from the mirrored disk. I assume this 
is because the MBR is not mirrored.

So to see if all the data is present on the 
mirrored disk I launch the "linux rescue" mode
from the RH7.3 CD but it cannot find any partitions
to mount from on the 2nd mirrored disk.

Making the same with the primary ide disk works 
fine, in thsi case "linux rescue" can mount all 
partitions.

How can I check if all data is being mirrored
on the 2nd ide disk?

How do I make the 2nd ide disk bootable? 
(I use grub as bootloader)
I already tried: 

root (hd1,0)
setup (hd1)

regards,
Christian

Re: RH 7.3 raid1 setup

[Alvin Oga]

hi ya christian..

did you use "fd" partition type when creating/partitioning the disk ??

what does lilo.conf ( or grub ) look like ??

thanx
alvin

On Mon, 3 Jun 2002, Christian Schmit wrote:

> 
> I installed RH 7.3 on raid1 using the standard
> RH 7.3 GUI setup.
> 
> Everything installs fine. According to mdstat
> raid1 seems to be running fine:
> 
> # cat /proc/mdstat 
> Personalities : [raid1] 
> read_ahead 1024 sectors
> md1 : active raid1 hda5[0] hdc5[1]
>       3494016 blocks [2/2] [UU]
>       
> md2 : active raid1 hda3[0] hdc3[1]
>       16892224 blocks [2/2] [UU]
>       
> md3 : active raid1 hda2[0] hdc2[1]
>       19454592 blocks [2/2] [UU]
>       
> md0 : active raid1 hda1[0] hdc1[1]
>       361344 blocks [2/2] [UU]
>       
> unused devices: <none>
> 
> However when shutting down the system and 
> disconnecting the 1st IDE drive I cannot 
> boot from the mirrored disk. I assume this 
> is because the MBR is not mirrored.
> 
> So to see if all the data is present on the 
> mirrored disk I launch the "linux rescue" mode
> from the RH7.3 CD but it cannot find any partitions
> to mount from on the 2nd mirrored disk.
> 
> Making the same with the primary ide disk works 
> fine, in thsi case "linux rescue" can mount all 
> partitions.
> 
> How can I check if all data is being mirrored
> on the 2nd ide disk?
> 
> How do I make the 2nd ide disk bootable? 
> (I use grub as bootloader)
> I already tried: 
> 
> root (hd1,0)
> setup (hd1)

Re[2]: RH 7.3 raid1 setup

[Christian Schmit]

Alvin,

Here is my config:

grub.conf:
-----------
default=0
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
title Red Hat Linux (2.4.18-3)
        root (hd0,0)
        kernel /vmlinuz-2.4.18-3 ro root=/dev/md2
        initrd /initrd-2.4.18-3.img


Partitions:
------------

Disk /dev/hda: 255 heads, 63 sectors, 5005 cylinders
Units = cylinders of 16065 * 512 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/hda1   *         1        45    361431   fd  Linux raid autodetect
/dev/hda2            46       810   6144862+  fd  Linux raid autodetect
/dev/hda3           811      1065   2048287+  fd  Linux raid autodetect

Disk /dev/hdc: 255 heads, 63 sectors, 5005 cylinders
Units = cylinders of 16065 * 512 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/hdc1   *         1        45    361431   fd  Linux raid autodetect
/dev/hdc2            46       810   6144862+  fd  Linux raid autodetect
/dev/hdc3           811      1065   2048287+  fd  Linux raid autodetect


mdstat:
---------

# cat /proc/mdstat
Personalities : [raid1] 
read_ahead 1024 sectors
md0 : active raid1 hda3[0] hdc3[1]
      2048192 blocks [2/2] [UU]
      
md2 : active raid1 hda2[0] hdc2[1]
      6144768 blocks [2/2] [UU]
      
md1 : active raid1 hda1[0] hdc1[1]
      361344 blocks [2/2] [UU]


Christian



AO> hi ya christian..

AO> did you use "fd" partition type when creating/partitioning the disk ??

AO> what does lilo.conf ( or grub ) look like ??

AO> thanx
AO> alvin

AO> On Mon, 3 Jun 2002, Christian Schmit wrote:

>> 
>> I installed RH 7.3 on raid1 using the standard
>> RH 7.3 GUI setup.
>> 
>> Everything installs fine. According to mdstat
>> raid1 seems to be running fine:
>> 
>> # cat /proc/mdstat 
>> Personalities : [raid1] 
>> read_ahead 1024 sectors
>> md1 : active raid1 hda5[0] hdc5[1]
>>       3494016 blocks [2/2] [UU]
>>       
>> md2 : active raid1 hda3[0] hdc3[1]
>>       16892224 blocks [2/2] [UU]
>>       
>> md3 : active raid1 hda2[0] hdc2[1]
>>       19454592 blocks [2/2] [UU]
>>       
>> md0 : active raid1 hda1[0] hdc1[1]
>>       361344 blocks [2/2] [UU]
>>       
>> unused devices: <none>
>> 
>> However when shutting down the system and 
>> disconnecting the 1st IDE drive I cannot 
>> boot from the mirrored disk. I assume this 
>> is because the MBR is not mirrored.
>> 
>> So to see if all the data is present on the 
>> mirrored disk I launch the "linux rescue" mode
>> from the RH7.3 CD but it cannot find any partitions
>> to mount from on the 2nd mirrored disk.
>> 
>> Making the same with the primary ide disk works 
>> fine, in thsi case "linux rescue" can mount all 
>> partitions.
>> 
>> How can I check if all data is being mirrored
>> on the 2nd ide disk?
>> 
>> How do I make the 2nd ide disk bootable? 
>> (I use grub as bootloader)
>> I already tried: 
>> 
>> root (hd1,0)
>> setup (hd1)

AO> -
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Re: Re[2]: RH 7.3 raid1 setup

[Alvin Oga]

hi ya christian

looks okay too me... not that i played with grub too much but..

make a boot floppy so that we can recover if my experiment fails ...

	dd=/vmlinuz-2.4.18-3  of=/dev/fd0 bs-1204

	( or make a boot flop w/ syslinux
	http://www.Linux-Consulting.com/Boot/boot.flop.syslinux.txt

	( test that you can boot from floppy )
	( you'll see lots of "...." on the screen as it boot

	- should also work even if hda or hdc is disconnected

than comment out initrd in your grub.conf and "re-run/re-initialize" grub

	- that'd be my guess of why if you disconnect hda that the system
	wont boot
	- am guessing that the kernel that is in the initrd is NOT able
	to support raid1

- if its not the initrd.. ( guess i better go play with grub too one day )

- interesting problem... :-)

thanx
alvin


> grub.conf:
> -----------
> default=0
> timeout=10
> splashimage=(hd0,0)/grub/splash.xpm.gz
> title Red Hat Linux (2.4.18-3)
>         root (hd0,0)
>         kernel /vmlinuz-2.4.18-3 ro root=/dev/md2
>         initrd /initrd-2.4.18-3.img
> 
> 
> Partitions:
> ------------
> 
> Disk /dev/hda: 255 heads, 63 sectors, 5005 cylinders
> Units = cylinders of 16065 * 512 bytes
> 
>    Device Boot    Start       End    Blocks   Id  System
> /dev/hda1   *         1        45    361431   fd  Linux raid autodetect
> /dev/hda2            46       810   6144862+  fd  Linux raid autodetect
> /dev/hda3           811      1065   2048287+  fd  Linux raid autodetect
> 
> Disk /dev/hdc: 255 heads, 63 sectors, 5005 cylinders
> Units = cylinders of 16065 * 512 bytes
> 
>    Device Boot    Start       End    Blocks   Id  System
> /dev/hdc1   *         1        45    361431   fd  Linux raid autodetect
> /dev/hdc2            46       810   6144862+  fd  Linux raid autodetect
> /dev/hdc3           811      1065   2048287+  fd  Linux raid autodetect
> 

Re[4]: RH 7.3 raid1 setup

[Christian Schmit]

Hi alvin,

I got it working by disconnecting the 1st disk
and then booting from cd in linux rescue mode
with the 2nd disk.

I mounted the "/" partition on the disk and
launched grub. Here I issued root (hd0,0) and
setup(hd1) to install grub in the mbr.

After this I can boot fine from both disks.

Christian





AO> hi ya christian

AO> looks okay too me... not that i played with grub too much but..

AO> make a boot floppy so that we can recover if my experiment fails ...

AO>         dd=/vmlinuz-2.4.18-3  of=/dev/fd0 bs-1204

AO>         ( or make a boot flop w/ syslinux
AO>         http://www.Linux-Consulting.com/Boot/boot.flop.syslinux.txt

AO>         ( test that you can boot from floppy )
AO>         ( you'll see lots of "...." on the screen as it boot

AO>         - should also work even if hda or hdc is disconnected

AO> than comment out initrd in your grub.conf and "re-run/re-initialize" grub

AO>         - that'd be my guess of why if you disconnect hda that the system
AO>         wont boot
AO>         - am guessing that the kernel that is in the initrd is NOT able
AO>         to support raid1

AO> - if its not the initrd.. ( guess i better go play with grub too one day )

AO> - interesting problem... :-)

AO> thanx
AO> alvin


>> grub.conf:
>> -----------
>> default=0
>> timeout=10
>> splashimage=(hd0,0)/grub/splash.xpm.gz
>> title Red Hat Linux (2.4.18-3)
>>         root (hd0,0)
>>         kernel /vmlinuz-2.4.18-3 ro root=/dev/md2
>>         initrd /initrd-2.4.18-3.img
>> 
>> 
>> Partitions:
>> ------------
>> 
>> Disk /dev/hda: 255 heads, 63 sectors, 5005 cylinders
>> Units = cylinders of 16065 * 512 bytes
>> 
>>    Device Boot    Start       End    Blocks   Id  System
>> /dev/hda1   *         1        45    361431   fd  Linux raid autodetect
>> /dev/hda2            46       810   6144862+  fd  Linux raid autodetect
>> /dev/hda3           811      1065   2048287+  fd  Linux raid autodetect
>> 
>> Disk /dev/hdc: 255 heads, 63 sectors, 5005 cylinders
>> Units = cylinders of 16065 * 512 bytes
>> 
>>    Device Boot    Start       End    Blocks   Id  System
>> /dev/hdc1   *         1        45    361431   fd  Linux raid autodetect
>> /dev/hdc2            46       810   6144862+  fd  Linux raid autodetect
>> /dev/hdc3           811      1065   2048287+  fd  Linux raid autodetect
>>