[SOLVED] "Software RAID level 1 issues with RHEL5"

adenial · 09-17-2010, 03:35 AM

Hi,
I have created RAID level1 in my home machine to test if it works.
I have convereted /dev/mdo to ext3 n mounted it on /RAID, havent done perm mounting.

my fdisk-l shows:-
Disk /dev/md0 doesn't contain a valid partition table.
Why is it showing above message?

Well cat /proc/mdstat show:-
Personalities : [raid1]
md0 : active raid1 sda7[1] sda6[0]
497856 blocks [2/2] [UU]
Is RAID in my machine working fine, how can i verify that??

well mdadm -D /dev/md0 gives:

/dev/md0:
Version : 00.90.03
Creation Time : Fri Sep 17 18:54:51 2010
Raid Level : raid1
Array Size : 497856 (486.27 MiB 509.80 MB)
Device Size : 497856 (486.27 MiB 509.80 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Fri Sep 17 18:58:34 2010
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

UUID : 5f4d29f4:8c89290c:6c5e1503:be68e4b3
Events : 0.2

Number Major Minor RaidDevice State
0 8 6 0 active sync /dev/sda6
1 8 7 1 active sync /dev/sda7
####looks like working fine, but y the meaasage in fdisk -l & also how can i verify??

sem007 · 09-17-2010, 05:01 AM

Quote:

Originally Posted by adenial

Hi,
I have created RAID level1 in my home machine to test if it works.
I have convereted /dev/mdo to ext3 n mounted it on /RAID, havent done perm mounting.

my fdisk-l shows:-
Disk /dev/md0 doesn't contain a valid partition table.
Why is it showing above message?

Well cat /proc/mdstat show:-
Personalities : [raid1]
md0 : active raid1 sda7[1] sda6[0]
497856 blocks [2/2] [UU]
Is RAID in my machine working fine, how can i verify that??

well mdadm -D /dev/md0 gives:

/dev/md0:
Version : 00.90.03
Creation Time : Fri Sep 17 18:54:51 2010
Raid Level : raid1
Array Size : 497856 (486.27 MiB 509.80 MB)
Device Size : 497856 (486.27 MiB 509.80 MB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Persistence : Superblock is persistent

Update Time : Fri Sep 17 18:58:34 2010
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0

UUID : 5f4d29f4:8c89290c:6c5e1503:be68e4b3
Events : 0.2

Number Major Minor RaidDevice State
0 8 6 0 active sync /dev/sda6
1 8 7 1 active sync /dev/sda7
####looks like working fine, but y the meaasage in fdisk -l & also how can i verify??

It is normal in software RAID ignore that error.

Quote:

RAID devices cannot be partitioned, like ordinary disks can. This can be a real annoyance on systems where one wants to run, for example, two disks in a RAID-1, but divide the system onto multiple different filesystems. A horror example could look like:

Have a look Software RAID

HTH
Regards,

adenial · 09-17-2010, 05:47 AM

Well thats fine.
There is a verification process if the raid is working fine, can u explaing how it goes??
& 1 more doubt do we need a perm. mount for RAID.

sem007 · 09-17-2010, 05:56 AM

Quote:

Originally Posted by adenial

Well thats fine.
There is a verification process if the raid is working fine, can u explaing how it goes??
& 1 more doubt do we need a perm. mount for RAID.

As mdadm details it seems RAID is working fine.

Quote:

State : clean
Raid Devices : 2
Active Devices : 2
Working Devices : 2

if you are root you doesn't require permission to mount raid device ( note also root or priviledge user can mount partition)

you can give file permission if you want to allow users to store data.

Regards,

adenial · 09-17-2010, 06:01 AM

Quote:

Originally Posted by sem007

As mdadm details it seems RAID is working fine.

if you are root you doesn't require permission to mount raid device ( note also root or priviledge user can mount partition)

you can give file permission if you want to allow users to store data.

Regards,

thanks

sem007 · 09-17-2010, 06:22 AM

Quote:

Originally Posted by adenial

thanks

You are Wel-come