cat /proc/mdstat -G -----Original Message----- From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Richard Hobbs Sent: Wednesday, April 20, 2005 4:42 AM To: 'General Red Hat Linux discussion list' Subject: RE: Soft-Raid Testing and other stuff... Hello, Sorry to drag up an old topic, and sorry again for top posting, but this question is related, but not directly... If a drive dies in a RH8.0 Soft-RAID configuration, will I ever be notified? Will an email ever get sent? Or, will I need to write a script and put it into cron which checks the status and reports if it's bad? If I need to write a custom script, what command can I manually type in which will give me the status of the array in terms of dead disks etc...? Thanks in advance, Hobbs. -- Richard Hobbs (Systems Administrator) Toshiba Research Europe Ltd. - Speech Technology Group Web: http://www.toshiba-europe.com/research/ Email: richard.hobbs@xxxxxxxxxxxxxxxxx Tel: +44 1223 376964 Mobile: +44 7811 803377 > -----Original Message----- > From: redhat-list-bounces@xxxxxxxxxx > [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Richard Hobbs > Sent: 21 January 2005 17:02 > To: 'General Red Hat Linux discussion list' > Subject: RE: Soft-Raid Testing and other stuff... > > Hello, > > > -----Original Message----- > > From: redhat-list-bounces@xxxxxxxxxx > > [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Richard Hobbs > > Sent: 20 January 2005 14:23 > > To: 'General Red Hat Linux discussion list' > > Subject: RE: Soft-Raid Testing and other stuff... > > > > Hello, > > > > > -----Original Message----- > > > From: redhat-list-bounces@xxxxxxxxxx > > > [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Ed Wilts > > > Sent: 20 January 2005 12:53 > > > To: General Red Hat Linux discussion list > > > Subject: Re: Soft-Raid Testing and other stuff... > > > > > > On Thu, Jan 20, 2005 at 11:17:01AM -0000, Richard Hobbs wrote: > > > > > > I didn't duplicate the MBR as far as I know... I > > > assumed that RAID 1 > > > > > > (mirroring) mirrored the entire disk, sector for sector... > > > > > > Nope - it's partition by partition. That's why you did the > > raidhotadd > > > *per partition*. > > > > > > There are pros and cons to this approach - the biggest pro > > is that you > > > don't have to mirror the entire disk. The biggest con is > > > that only data > > > partitions are mirrored. > > > > > > For details on mirror the mbr, see: > > > http://www.dur.ac.uk/a.d.stribblehill/mirrored_grub.html > > > > > > I haven't tried this but it's referenced by the online Red Hat > > > documentation. > > > > > > > > > Also, if I then insert a blank disk, will it automatically > > > > > > re-generate the > > > > > > data onto it? Will I have to duplicate the MBR > manually again? > > > > > > > > > > > > You will always have to do this manually. Software RAID > > knows nothing > > > about the MBR - only partitions. > > > > So... am I correct in saying that if I run 'raidhotadd' on > > all partitions to > > get them mirrored correctly, and then I run the grub stuff to > > install the > > slave MBR, all is set and there's absolutely nothing else > > that needs to be > > done? In order to have a fully resilient system? > > > > I realise the BIOS might need to be altered to tell it to > > boot from the > > slave if the master is dead, but apart from that, is > > everything done that > > needs to be? > > > > Also, what are the exact steps to follow if the master disk > dies in a > > soft-raid 1 environment? > > What are the steps to follow if the secondary disk dies in a > > soft-raid 1 > > environment? > > > > I assume they are fairly similar... Just replace the dead > disk with an > > identical blank one, boot up and reinstall the MBR once the > automatic > > reconstruction is done, right?? Or is it not that simple... > > > > Thanks again, > > Hobbs. > > I have now solved this problem completely, so thanks to Ed Wilts and > SpookyEddy from TechIMO.com. > > The answer was basically that I have to mirror the partitions > independantly, > and I have to duplicate the MBR. > > Also, if a disk fails, I have to manually re-create the > partitions on the > blank disk exactly as they are on the working disk. > > The full answer can be found here: > > http://unixforum.co.uk/667.html > > Thanks to all :-) > > Hobbs. > > -- > Richard Hobbs (Systems Administrator) > Toshiba Research Europe Ltd. - Speech Technology Group > Web: http://www.toshiba-europe.com/research/ > Email: richard.hobbs@xxxxxxxxxxxxxxxxx > Tel: +44 1223 376964 Mobile: +44 7811 803377 > > > > _____________________________________________________________________ > This e-mail has been scanned for viruses by MCI's Internet > Managed Scanning Services - powered by MessageLabs. 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