IDE bus rescan

IDE bus rescan

[Maurice Hilarius]

Hi There

Problem:
On IDE software RAID setup, we want to be able to hot-swap out a failed disk.
Using 3Ware cards we can swap only by rebooting system to recognise the new 
drive

Question: Is there a way to rescan IDE bus to recognise a new drive?

Thanks!

With our best regards,

Maurice W. Hilarius       Telephone: 01-780-456-9771
Hard Data Ltd.               FAX:       01-780-456-9772
11060 - 166 Avenue        mailto:maurice@harddata.com
Edmonton, AB, Canada      http://www.harddata.com/
    T5X 1Y3

Ask me about the UP1500 Alpha - Full systems from $3,500!

Re: IDE bus rescan

[Friedrich Lobenstock]

Maurice Hilarius wrote:
> Hi There
> 
> Problem:
> On IDE software RAID setup, we want to be able to hot-swap out a failed 
> disk.
> Using 3Ware cards we can swap only by rebooting system to recognise the 
> new drive
> 
> Question: Is there a way to rescan IDE bus to recognise a new drive?

Are you using the 3Ware Diskmanager Daemon and its webinterface or not?
It seems not.

-- 
MfG / Regards
Friedrich Lobenstock

Re: IDE bus rescan

[Maurice Hilarius]

With regards to your message at 04:54 PM 6/4/02, Friedrich Lobenstock. 
Where you stated:
>Maurice Hilarius wrote:
>>Hi There
>>Problem:
>>On IDE software RAID setup, we want to be able to hot-swap out a failed disk.
>>Using 3Ware cards we can swap only by rebooting system to recognise the 
>>new drive
>>Question: Is there a way to rescan IDE bus to recognise a new drive?
>
>Are you using the 3Ware Diskmanager Daemon and its webinterface or not?
>It seems not.
As I understand it that is only useful if we use the 3Ware BIOS RAID.
In this case we are interested in doing this with software RAID
So how would we make it rescan with this??


With our best regards,

Maurice W. Hilarius       Telephone: 01-780-456-9771
Hard Data Ltd.               FAX:       01-780-456-9772
11060 - 166 Avenue        mailto:maurice@harddata.com
Edmonton, AB, Canada      http://www.harddata.com/
    T5X 1Y3

Ask me about the UP1500 Alpha - Full systems from $3,500!

Re: IDE bus rescan

[Friedrich Lobenstock]

Maurice Hilarius wrote:
>> Are you using the 3Ware Diskmanager Daemon and its webinterface or not?
>> It seems not.
> 
> As I understand it that is only useful if we use the 3Ware BIOS RAID.
> In this case we are interested in doing this with software RAID
> So how would we make it rescan with this??

Then why on earth did you buy a 3Ware Controller if you are using it as a
normal ide controller?

-- 
MfG / Regards
Friedrich Lobenstock

Re: IDE bus rescan

[Maurice Hilarius]

With regards to your message at 05:22 PM 6/4/02, Friedrich Lobenstock. 
Where you stated:
>Maurice Hilarius wrote:
>>>Are you using the 3Ware Diskmanager Daemon and its webinterface or not?
>>>It seems not.
>>As I understand it that is only useful if we use the 3Ware BIOS RAID.
>>In this case we are interested in doing this with software RAID
>>So how would we make it rescan with this??
>
>Then why on earth did you buy a 3Ware Controller if you are using it as a
>normal ide controller?


A few good reasons:
Performance using software RAID is about twice as fast
When using software RAID it is not fussy if all disks are identical or not.
The 3Ware makes a really good disk interface, is fast, and uses little CPU.




With our best regards,

Maurice W. Hilarius       Telephone: 01-780-456-9771
Hard Data Ltd.               FAX:       01-780-456-9772
11060 - 166 Avenue        mailto:maurice@harddata.com
Edmonton, AB, Canada      http://www.harddata.com/
    T5X 1Y3

Ask me about the UP1500 Alpha - Full systems from $3,500!

Re: IDE bus rescan

[David Rees]

On Tue, Jun 04, 2002 at 11:37:30PM -0600, Maurice Hilarius wrote:
> With regards to your message at 05:22 PM 6/4/02, Friedrich Lobenstock. 
> Where you stated:
> >Maurice Hilarius wrote:
> >>>Are you using the 3Ware Diskmanager Daemon and its webinterface or not?
> >>>It seems not.
> >>As I understand it that is only useful if we use the 3Ware BIOS RAID.
> >>In this case we are interested in doing this with software RAID
> >>So how would we make it rescan with this??
> >
> >Then why on earth did you buy a 3Ware Controller if you are using it as a
> >normal ide controller?
> 
> A few good reasons:
> Performance using software RAID is about twice as fast
> When using software RAID it is not fussy if all disks are identical or not.
> The 3Ware makes a really good disk interface, is fast, and uses little CPU.

If you use 3DM, you should be able to do it this way:

1. Navigate to the Configure Display. 
2. Click on the check box of the failed drive. 
3. Click button Remove Drive. 
4. Physically remove the failed drive and replace it with a new drive. 
5. Click on the check box of the new drive. 
6. Click button Add Drive. 

I haven't actually tried it myself, but this should work.

-Dave

Re: IDE bus rescan

[Gregory Leblanc]

On Tue, 2002-06-04 at 16:17, Maurice Hilarius wrote:
> With regards to your message at 04:54 PM 6/4/02, Friedrich Lobenstock. 
> Where you stated:
> >Maurice Hilarius wrote:
> >>Hi There
> >>Problem:
> >>On IDE software RAID setup, we want to be able to hot-swap out a failed disk.
> >>Using 3Ware cards we can swap only by rebooting system to recognise the 
> >>new drive
> >>Question: Is there a way to rescan IDE bus to recognise a new drive?
> >
> >Are you using the 3Ware Diskmanager Daemon and its webinterface or not?
> >It seems not.
> As I understand it that is only useful if we use the 3Ware BIOS RAID.
> In this case we are interested in doing this with software RAID
> So how would we make it rescan with this??

Hmm, hard to say.  When I'm hot swapping PCI cards, I simply unload the
kernel module that is the driver for that card before I power-off/remove
the card.  I don't know enough about kernel internals to know how to do
this with a single IDE bus, though.  
	Greg

-- 
Portland, Oregon, USA.
Please don't copy me on replies to the list.

Re: IDE bus rescan

[Friedrich Lobenstock]

Maurice Hilarius wrote:
> 
> Question: Is there a way to rescan IDE bus to recognise a new drive?


With a "normal" IDE controller my best guess would be:

# hdparm -h 2>&1|grep DANGER
  -r   get/set readonly flag (DANGEROUS to set)
  -R   register an IDE interface (DANGEROUS)
  -U   un-register an IDE interface (DANGEROUS)
  -w   perform device reset (DANGEROUS)
  -W   set drive write-caching flag (0/1) (DANGEROUS)
  -x   perform device for hotswap flag (0/1) (DANGEROUS)


-- 
MfG / Regards
Friedrich Lobenstock