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R: R: [dm-devel] - info about dm



Hi Phillip,

Thanks for the answer

>> Yes... at least if your bios actually starts the rebuild process
instead 
>> of just marking the array as needing rebuilt and relying on the OS to
do 
>> it.

...well I have to test it: during the installation procedures, when I
tried to configure this damn RAID and I got the disk inconsistency
(“ERROR:
asr: Invalid RAID config table checksum on /dev/sda” or “asr: Invalid
magic number in RAID table; saw 0x0 expected…”) I tested even the
rebuilding through the BIOS with no results, while I'm sure the
rebuilding works (tested with working HD)...bah, maybe the rebuilding
was not completed and I had to wait a little longer...

Can you specify which commands are used for creating the device
(manually) the first time? I used "dmsetup create" but someone replied
that dmsetup is a debug command rather than the correct procedure. 
Let me repeat ("repetita juvant": latin proverb ;-P): DM simply
recognize a BIOS RAID configuration and translate it to the system,
mapping it to a virtual device...so all I need is to launch "dmraid -ay"
for activating...

One last question, about the development: are they working for having a
way to "manage" RAID through DM? I'm talking above all about stopping
the RAID, disabling disks, rebuilding the RAID...

Thanks again for all the support
Vega



-----Messaggio originale-----
Da: dm-devel-bounces redhat com [mailto:dm-devel-bounces redhat com] Per
conto di Phillip Susi
Inviato: martedì 13 novembre 2007 19.22
A: ATARAID (eg, Promise Fasttrak, Highpoint 370) related discussions
Cc: 'device-mapper development'
Oggetto: Re: R: [dm-devel] - info about dm

Vega Forneris wrote:
> 1) I need to change an HD which has problems...here the steps I guess
> from what I read in these days:
> - halt the machine (ok, ok it's obvious ;-P )
> - change the faulty HD
> - boot
> - when BIOS starts the RAID manager, enter and rebuild the RAID (1:
> mirror)
> - after the rebuilding, everything should be ok.
> 
> ...is it correct?

Yes... at least if your bios actually starts the rebuild process instead

of just marking the array as needing rebuilt and relying on the OS to do

it.

> 2) I have a machine with 2 HD SATA, on the first we have the OS
> installed (and working!), the second is blank (just added), I want to
> create a RAID 1 (mirror) of the whole disk:
> - ...
> I don't want to guess ;-P

The same way you did it the first time: in the bios.  Doing so will 
destroy the existing data on the drive though, so you will want to 
backup first.

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