topic HW mirror in Operating System - Linux

HW mirror

Carme Torca — Tue, 04 May 2004 08:20:21 GMT

Hi,

I have ask before for he SW Mirror, but what about de HW mirror??.
Could I known if I have HW mirror configured??

Thanks!,
Carmen.

Re: HW mirror

Mark Grant — Tue, 04 May 2004 08:24:43 GMT

I don't wish to sound silly here but I think that would depend on the hardware.

If you have a disk controller that supports mirroring, you will have mirroring and the operating system need know nothing about it.

Re: HW mirror

Carme Torca — Tue, 04 May 2004 08:40:08 GMT

Yes, but is not any way to know if one server has HW mirror??... I have 4 servers on, and I cannot put down to see theirs setups...

Maybe in one file, maybe in one log??

Thanks!,

Re: HW mirror

Mark Grant — Tue, 04 May 2004 08:43:43 GMT

If it's hardware, it probably won't be configured anywhere in the software. Except possibly in the configuration for the driver. I would find out which disk controllers you have and look them up on the internet to see if they support it.

Re: HW mirror

Bharat Katkar — Tue, 04 May 2004 08:53:17 GMT

Yes you know about it, provided you have proper Software provided alongwith the Storage Box and installed on the Server.
Like we have SDM running on our server and FC60 connected to it. We have configured it as raid 0/1 and when i see it thr' SDM (Storage Device Manager) i am able to see entire structure of the Disk Enclosures with disk info, Lun Info, Raid level used etc.

What you can do is see if you have already one or try installing it on your server. This will also allow to configure, monitor performance of the Storage Box.

Re: HW mirror

Roberto Polli — Tue, 04 May 2004 09:03:20 GMT

hw mirrore depends that your controller.
If cciss use

cat /proc/drivers/cciss/cciss0

search this forum: you'll a detailed answer.

Peace, R.

Re: HW mirror

Carme Torca — Tue, 04 May 2004 09:15:51 GMT

Hi Robert,

# cat /proc/driver/cciss/cciss0 cciss0: HP
Smart Array 5312 Controller
Board ID: 0x40830e11
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

Then c0d0 es in mirror, and c0d1 isn't it.
Is it correct???

Thanks!!
Carmen.

Re: HW mirror

Alexander Chuzhoy — Tue, 04 May 2004 09:22:19 GMT

to see if you have hw mirror installed you have to reboot the server/station and to enter to the controller configuration.
Otherwise you should install controller's agent on your operating system.

Re: HW mirror

Roberto Polli — Tue, 04 May 2004 09:57:18 GMT

Hi Carmen,
I think you made a mess of postings.
The last you sent refers to a linux OS on a machine with a cciss smartarray controller and concerns a post sent by you on the linux forum.
Peace, R.

Re: HW mirror

Roberto Polli — Tue, 04 May 2004 10:06:24 GMT

sorry Carmen! My fault: i confonded two browser tabs.

1) know on which filesystem your root is:
#df -h /
Filesystem Size Used Avail Use% Mounted on
/dev/cciss/c0d0p2 6.4G 6.0G 193M 97% /

2) This brings you directly to you module.
2bis) Take a look in /proc/driver

To know your hardware modules you can look at
#lsmod
and see if there's any block-device module.
#modprobe -l|grep block

Peace, R

Re: HW mirror

Sanjay_6 — Tue, 04 May 2004 12:59:03 GMT

Hi Carmen,

Try this for more info on RAID levels.

http://www.acnc.com/04_00.html

Hope this helps.

Regds