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Old 10-22-2008, 11:22 AM   #1
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Registered: Nov 2005
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Exclamation Complex Software raid


I have inherited an old linux linux system from the previous sysadmin.
It has slot for 12sata disks.
Currently I think one ata disk is for boot (hda)

The other 12 disks are partitioned with two partitions each.
Then one Raid 6 is made on the first partitions on all drives and one Raid on on the second partitions.
Here's my mdstat to clear things out.
Personalities : [raid6]
md11 : active raid6 sdl1[11] sdk1[10] sdj1[9] sdi1[8] sdh1[7] sdg1[6] sdf1[5] sde1[4] sdd1[3] sdc1[2] sdb1[1] sda1[0]
31641600 blocks level 6, 1024k chunk, algorithm 2 [12/12] [UUUUUUUUUUUU]

md10 : active raid6 sdl2[11] sdk2[10] sdj2[9] sdi2[8] sdh2[7] sdg2[6] sdf2[5] sde2[4] sdd2[3] sdc2[2] sdb2[1] sda2[0]
2409748480 blocks level 6, 1024k chunk, algorithm 2 [12/12] [UUUUUUUUUUUU]

unused devices: <none>

My problem is that i haven't dealt with software raids in a while. (Plus the setups feels a bit complex)
And the question is: What do I do in case of a disk failure.
If for example sdk1 were to fail, do i have to manually fail sdk2? And what to do then?
Reboot with a new drive in place. Then create the partitions and then add them to the array?

To top things there's an LVM on top

Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg00-root 40G 30G 7.7G 80% /
/dev/mapper/vg00-root2 40G 21G 18G 54% /root2
/dev/hda2 99M 83M 11M 89% /boot
/dev/hda3 9.7G 2.0G 7.3G 22% /rootadmin
none 1014M 0 1014M 0% /dev/shm
/dev/mapper/vg00-smbshare 99G 87G 6.5G 94% /smbshare
/dev/mapper/vg00-nfsusr 40G 32G 6.4G 84% /nfsroot_usr
/dev/mapper/vg00-nfsroot 15G 2.6G 12G 19% /nfsroot_root
/dev/mapper/vg00-nfsclnt 20G 7.7G 12G 42% /nfsroot_client
/dev/mapper/vg00-nfspers2 9.9G 653M 8.8G 7% /nfsroot_pers
/dev/mapper/vg00-disk0 247G 230G 4.2G 99% /disk0
/dev/mapper/vg00-disk1 247G 131G 103G 56% /disk1
/dev/mapper/vg00-disk2 247G 160G 75G 69% /disk2
/dev/mapper/vg00-disk3 296G 109G 172G 39% /disk3
/dev/mapper/vg00-mail 300G 81G 220G 27% /mail
I have: mdctl - v0.5 - 23 August 2001
Probably from source
The disks seem to be on two 3ware cards.
03:01.0 RAID bus controller: 3ware Inc 7xxx/8xxx-series PATA/SATA-RAID (rev 01)
04:02.0 RAID bus controller: 3ware Inc 7xxx/8xxx-series PATA/SATA-RAID (rev 01)
Linux 2.6.17-1.2157_FC5smp #1 SMP Tue Jul 11 23:24:16 EDT 2006 i686 i686 i386 GNU/Linux
Fedora Core release 5 (Bordeaux)
Please help!. Any contributions welcome...

Last edited by LeffeOne; 10-22-2008 at 11:24 AM.
Old 10-23-2008, 05:06 AM   #2
Registered: Feb 2006
Distribution: Fedora,Solaris
Posts: 46

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Hello LeffeOne

i would suggest that you use some virtual machine to play with software raid.

i have used VMWARE than i have installed centOS

and added extra hard drives... (virtual hard drives... files)

create a raid... put some data on it... break it... fix it.. and so on

good luck
Old 10-23-2008, 05:10 AM   #3
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Registered: Nov 2005
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That is a good idea. (when I can actually get the time)
Any pointer or hints on my current problem is more than welcome though.


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