Comments on: DMRAID on Ubuntu with SATA fakeraid

By: Zack

Zack — Wed, 28 Oct 2009 08:46:40 +0000

I followed the steps in the tutorial and everything seemed to be working fine, until reboot. I’m getting the same error message as rokur “ALERT! /dev/mapper/… does not exist. Dropping to shell!”

I’ve double checked my menu.lst file and fstab files and they are setup according to the instructions as far as I can tell.

Did you figure out why this was happing to rokur?

By: teenoie

teenoie — Wed, 07 Oct 2009 02:50:49 +0000

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By: Ubuntu 9.04 Fake RAID problems | Atlantic Linux Blog

Ubuntu 9.04 Fake RAID problems | Atlantic Linux Blog — Tue, 15 Sep 2009 20:04:11 +0000

[...] were having the opposite problem of wanting to use dmraid but the installer not supporting it (like DMRAID on Ubuntu with SATA fakeraid, dmraid missing from livecd and Need dmraid to support fakeraid). Presumably most of these [...]

By: lar5

lar5 — Wed, 18 Feb 2009 08:28:14 +0000

Use 8.10 alternate cd…. everything will go automatic during install with stripped or mirrored raid.
greetz…

By: Fileserver Linux con RAID software e LVM: consigli? - Matteo Moro

Fileserver Linux con RAID software e LVM: consigli? - Matteo Moro — Mon, 02 Feb 2009 06:01:00 +0000

[...] basata su RAID software (che mi dicono essere decisamente più stabile e performante rispetto a dmraid) e LVM, ma mi piacerebbe sentire qualche opinione da qualcuno più esperto di me, onde evitare di [...]

By: Tuffi

Tuffi — Fri, 30 Jan 2009 21:28:48 +0000

I tried that with the Kubuntu 8.04.1 desktop CD and the PC boots and it runs, no problem.
But when u add with the root a user “tuffi” and login in with tuffi, i see only:

and i cannot do anything.

what to must i do?

Tuffi

By: darkskypoet

darkskypoet — Mon, 19 Jan 2009 12:40:37 +0000

@15: can you just rebuild in Bios?

With my promise running Fakeraid (dmraid) I can have it rebuild in bios… However… that is really suboptimum, as it can’t be running and utilized while it is rebuilding… Does anyone have an answer as to whether or not there is a way (manually is fine) to rebuild the dmraid array while running (assume raid 1 ofcourse, as a failed drive in raid 0 means SOL).

Thanks

By: Larry

Larry — Wed, 17 Dec 2008 01:29:10 +0000

Thanks, this did the trick, and it’s still required with Ubuntu 8.10 which doesn’t include dmraid either.

You might want to note a few things:
1) This process works but with a few tweaks if the Ubuntu partition is not the first one. In my case, Windows is on my first partition (yeah, I should get rid of that…). So I had to tweak the fdisk commands (e.g., create partitions 2 and 3, not 1 and 2) and the grub commands a bit to make it work (e.g., “(hd0,1)” not “(hd0,0)).

2) Afterwards, I think you should warn folks that you will truly have a minimal install. This means no GUI desktop, for example. You might want to give a link or pointer on installing gnome, which is what most newbies would have expected to see.

By: deci

deci — Mon, 25 Aug 2008 03:25:29 +0000

very difficult to follow, looks like I am back to vista 64, annoying that vista only asks for a raid driver and everything just works compared to this.

By: dmraidusr

dmraidusr — Sat, 23 Aug 2008 16:49:40 +0000

Hi.. please help.

I have installed dmraid on my Ubuntu 8.04 server. I have mirrored 2 SATA 320GB hard drives on my Intel Software RAID motherboard – S3210SHLC

The setup is like this –

80GB Ubuntu – non RAID
320GB x 2 – isw – RAID mirror – volume label – abraid203 – dmraid – mounted on /home1

My dmraid was working properly until one of my hard disks failed. I put in a new 320 GB as a replacement.
In the Intel RAID utility (bios/post) – it shows my raid volume “Status” as “REBUILD” – but does not give me an option to Rebuild in the utility itself. I repeat – there is no option to REBUILD RAID in the intel utility.

It gives the message “RAID will be Rebuilt in the Operating System”
I left the PC on for a day but my RAID doesnot rebuild on it’s own.

Here is the biggest question “HOW DO I REBUILD MY RAID USING dmraid?”

My RAID status in linux is currently as follows

dmraid -r
/dev/sdc: isw, “isw_eedegdeef”, GROUP, ok, 625142445 sectors, data@ 0
/dev/sdb: isw, “isw_eedegdeef”, GROUP, ok, 625142445 sectors, data@ 0

dmraid -s
*** Group superset isw_eedegdeef
–> Active Subset
name : isw_eedegdeef_abraid203
size : 625137920
stride : 128
type : mirror
status : ok
subsets: 0
devs : 2
spares : 0

i give the command

fdisk /dev/mapper/isw_eedegdeef_abraid203

Command (m for help): v
625137927 unallocated sectors

it verifies the new hard disk as unallocated sectors.

I’m stuck at this point. If dmraid doenot have an option to rebuild then the only option is to change the motherboard or get a seperate RAID card and create a new RAID set.

Thanks,

Please reply if you can help.