Raid autodetection

Raid autodetection

[danci]

Hi!

Is there a tool to force the kernel to try auto-detecting RAID? I think I
saw that SuSE has something like that implemented, so they can use it in
initrd...

Thanks, D.

Re: Raid autodetection

[danci]

On Tue, 3 Dec 2002 danci@agenda.si wrote:

> Hi!
>
> Is there a tool to force the kernel to try auto-detecting RAID? I think I
> saw that SuSE has something like that implemented, so they can use it in
> initrd...

OK, just found out that SuSE is adding it in their build. Is there a
reason why this is not in the 'normal' raidtools sources (yet)?

 Thanks, D.

Re: Raid autodetection

[Steven Dake]

Danci,

You can set a RAID to autostart by setting its partition id to 0xfd 
(RAID autostart) with the fdisk utility.  You could also use an initrd 
to scan the configuration file and start the RAID arrays.

The second is what most distributions do such as RedHat.

Thanks
-steve

danci@agenda.si wrote:

>Hi!
>
>Is there a tool to force the kernel to try auto-detecting RAID? I think I
>saw that SuSE has something like that implemented, so they can use it in
>initrd...
>
>Thanks, D.
>
>-
>To unsubscribe from this list: send the line "unsubscribe linux-raid" in
>the body of a message to majordomo@vger.kernel.org
>More majordomo info at  http://vger.kernel.org/majordomo-info.html
>
>
>
>  
>

Re: Raid autodetection

[danci]

On Tue, 3 Dec 2002, Steven Dake wrote:

> You can set a RAID to autostart by setting its partition id to 0xfd
> (RAID autostart) with the fdisk utility.

I know that, it's what I do for last three years. But recently, I've
been trying to use modular kernels with SCSI drivers as modules.

As the inital kernel raid autodetection happens BEFORE initrd loads the
SCSI drivers, it won't work.

> You could also use an initrd
> to scan the configuration file and start the RAID arrays.
>
> The second is what most distributions do such as RedHat.

Found out that SuSE has another way - they add a 'raidautorun' utility to
raidtools, which forces the kernel to re-autodetect raid stuff. It can be
used in a initrd, AFTER loading the SCSI driver.

With this, it's probably even possible to have RAID compiled as modules.

Thanks, D.

Re: Raid autodetection

[Wim Vinckier]

On Wed, 4 Dec 2002 danci@agenda.si wrote:

> On Tue, 3 Dec 2002, Steven Dake wrote:
>
> > You can set a RAID to autostart by setting its partition id to 0xfd
> > (RAID autostart) with the fdisk utility.
>
> I know that, it's what I do for last three years. But recently, I've
> been trying to use modular kernels with SCSI drivers as modules.
>
> As the inital kernel raid autodetection happens BEFORE initrd loads the
> SCSI drivers, it won't work.
>

You have to build your own initrd which loads the correct modules.  I
thought SuSE has its own procedures to do it.  I thought you have to add
the modules somewhere in /etc/rc.config and run mkinitrd.  Just check the
documentation.

> > You could also use an initrd
> > to scan the configuration file and start the RAID arrays.
> >
> > The second is what most distributions do such as RedHat.
>
> Found out that SuSE has another way - they add a 'raidautorun' utility to
> raidtools, which forces the kernel to re-autodetect raid stuff. It can be
> used in a initrd, AFTER loading the SCSI driver.
>
> With this, it's probably even possible to have RAID compiled as modules.
>
> Thanks, D.
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

------------------------------------------------------------------------
Wim VINCKIER
Wasstraat 38                                          Wim-Raid@tisnix.be
B-9000  Gent                                               ICQ 100545109
------------------------------------------------------------------------
'Windows 98 or better required' said the box... so I installed linux

Re: Raid autodetection

[danci]

On Wed, 4 Dec 2002, Wim Vinckier wrote:

> On Wed, 4 Dec 2002 danci@agenda.si wrote:
>
> > On Tue, 3 Dec 2002, Steven Dake wrote:
> >
> > > You can set a RAID to autostart by setting its partition id to 0xfd
> > > (RAID autostart) with the fdisk utility.
> >
> > I know that, it's what I do for last three years. But recently, I've
> > been trying to use modular kernels with SCSI drivers as modules.
> >
> > As the inital kernel raid autodetection happens BEFORE initrd loads the
> > SCSI drivers, it won't work.
> >
>
> You have to build your own initrd which loads the correct modules.  I
> thought SuSE has its own procedures to do it.  I thought you have to add
> the modules somewhere in /etc/rc.config and run mkinitrd.  Just check the
> documentation.

I know and I'm NOT using SuSE.

I just noted a 'new' command that SuSE had while the normal, plain
raidtools from Mingo had none. So I implemented the 'new' command
(raidautorun) in my distro and now it's all OK.

  D.

Hot swap on IDE

[bmoon]

Hello,

I want to find that anyone made a successful work for the HOT-SWAP
on the IDE master/slave.

Ther are many systems that use the IDE for RAID. However, I heard most of
them
use the MASTER.

Is it really impossible to make use of both master and slave?
I mean "Are there any sucess story to use the slave?".

Thanks in advance,

Bo

Re: Hot swap on IDE

[Roy Sigurd Karlsbakk]

you don't want more than one disk per channel. it fscks up the performance big 
time. I'm aware of that 3ware's controllers are supposed to support hot swap, 
but they do not support more than one disk per channel. But then - their 
controllers have 4, 8 and 12 ports, so you don't need two drives per channel 
anyway

On Friday 06 December 2002 20:03, bmoon wrote:
> Hello,
>
> I want to find that anyone made a successful work for the HOT-SWAP
> on the IDE master/slave.
>
> Ther are many systems that use the IDE for RAID. However, I heard most of
> them
> use the MASTER.
>
> Is it really impossible to make use of both master and slave?
> I mean "Are there any sucess story to use the slave?".
>
> Thanks in advance,
>
> Bo
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html

-- 
Roy Sigurd Karlsbakk, Datavaktmester
ProntoTV AS - http://www.pronto.tv/
Tel: +47 9801 3356

Computers are like air conditioners.
They stop working when you open Windows.