topic Re: Checking root mirror in Operating System - Linux

Checking root mirror

Shahul — Thu, 29 Apr 2004 04:32:08 GMT

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

Re: Checking root mirror

Claudio Cilloni — Thu, 29 Apr 2004 04:48:42 GMT

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

Re: Checking root mirror

Jeroen Peereboom — Thu, 29 Apr 2004 04:55:09 GMT

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.

Re: Checking root mirror

Roberto Polli — Thu, 29 Apr 2004 04:59:42 GMT

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.

Re: Checking root mirror

Roberto Polli — Thu, 29 Apr 2004 05:00:56 GMT

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

Re: Checking root mirror

KC_22 — Tue, 27 Sep 2005 23:01:34 GMT

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

Re: Checking root mirror

Ivan Ferreira — Wed, 28 Sep 2005 08:06:55 GMT

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

Re: Checking root mirror

Jack Baruth_1 — Tue, 04 Oct 2005 15:48:35 GMT

KC,

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