Checking root mirror

[Shahul]

HI,

Could some one tell me how can I check which is the root HDD and is it mirrored or not? I don't have much experience in Linux.

TIA
Shahul

[Claudio Cilloni]

run the df command. the disk/partition of the root filesystem is in the first column of the 'Mounted on /' line (last column).

if the device name is something like /dev/md0 (md means 'multiple device') it could be a software-mirrored device.

hth,
Claudio

[Jeroen Peereboom]

Shahul,

you could be using hardware mirroring on a RAID controller. You need to get the configuration of the controller. I think that means rebooting.

JP.

[Roberto Polli]

Hi,
Clausio is right if you have a software raid but you have to chek which kind of raid it is (can be a stripe!)

Jerome,
you don't need to reboot to check hw-raid.
You can
#lsmod
to understand which kind of controller are you using.
Then look in
/proc/drivers/MODULENAME

mine gives the following output

localhost#:/proc$cat driver/cciss/cciss0
cciss0: HP Smart Array 5312 Controller
Board ID: 0x4432qsa11
Firmware Version: 2.36
IRQ: 18
Logical drives: 2
Current Q depth: 0
Current # commands on controller: 0
Max Q depth since init: 128
Max # commands on controller since init: 130
Max SG entries since init: 31
Monitor thread period: 0
Monitor thread deadline: 0
Status: operational
Sequential access devices: 0

cciss/c0d0: 17.35GB RAID 1(0+1)
cciss/c0d1: 173.61GB RAID 0

Hope it helps.
Peace, R.

[Roberto Polli]

Jeroen,
sorry to have misspelt your name :_( Hope you'll forgive!

[KC_22]

Hi

I check not see the status of raid hard when i type /proc/driver/cciss/cciss0

the following it the output. How I can check the raid disk stautus

cciss0: Compaq Smart Array 5i Controller
Board ID: 0x40800e11
Firmware Version: 2.36
Memory Address: 0xf883a000
IRQ: 10
Logical drives: 1
Highest Logical Volume ID: 0
Current Q depth: 0
Current # commands on controller 0
Max Q depth since init: 128
Max # commands on controller since init: 129
Max SG entries since init: 31
Sequential access devices: 0

cciss/c0d0: blksz=512 nr_blocks=142239510
nr_allocs = 14815924
nr_frees = 14815924

Thanks
KC

[Ivan Ferreira]

If you use software raid, use cat /proc/mdstat to verify the status of the raid devices.

[Jack Baruth_1]

KC,

The Compaq SmartArray has some built in utilities. Reboot the system and enter the utility menu to see how your drives are mirrored.