RE: Software Raid Problem

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Are you guys using the smartd to watch your raid disks?  I just discovered
this tool recently, and its pretty neat.  It can send you an email when a
disk is going from good to bad, etc.

jonathan

-----Original Message-----
From: shrike-list-admin@xxxxxxxxxx [mailto:shrike-list-admin@xxxxxxxxxx] On
Behalf Of Ivo Mencke
Sent: Tuesday, January 27, 2004 3:17 AM
To: Shrike-List
Subject: Re: Software Raid Problem

Thanks - I partitioned them yesterday using fdisk, but sfdisk looks like
the kind of thing i was looking for (just a faster way of doing it). I
then used raidhotadd to sync them, and checked using dmesg &
/proc/mdstat. I was just being lazy when i emailed the list, hoping for
a quicker way of doing all that.

You have to create the partitions before you can use raidhotadd.

im surprised that there is nothing in raidtools that just lets you
import a new disk instead of a failed one and automatically copy over
all partitions and sync all the data, in one go. i know this would be a
dangerous command but it'd be very useful. ah well.

:)

thanks for the help Justin & Arend!,
ivo.

On Mon, 2004-01-26 at 19:46, Arend wrote:
> On Mon, 26 Jan 2004, Justin Zygmont wrote:
> 
> > why not try to use raidhotadd and it if it will work like that.
> >
> 
> The partitions need to be created first.
> 
> 
> > On 26 Jan 2004, Ivo Mencke wrote:
> >
> > > Hello,
> > >
> > > This is off topic.
> > >
> > > I have a rh9 box with software raid (all the partitions on sda are
> > > mirrored via raid1 onto sdc)
> > >
> > > sdc failed. I plugged in a new drive (same size).. but the partitions
> > > did not sync over. I would like to know if there is a way to just
import
> > > the new disk into the array and have everything just sync over,
> > > partitions etc, or do i need to create the partitions first on sdc and
> > > then sync them all using raidhotadd?
> 
> You need to make the partitions on sdc first, then raidhotadd will work,
> and the disk will sync up.
> 
> This link is helpful, as are others on google:
> http://lists.us.dell.com/pipermail/linux-poweredge/2003-July/014331.html
> 
> I just did this the other day. Something like this ought to get you
> started:
> 
> man sfdisk
> man raidhotadd
> 
> sfdisk -d /dev/sda > sda.part.info
> cat sda.part.info | sed 's/sda/sdc/' > sdc.part.info
> sfdisk /dev/sdc < sdc.part.info
> 
> # repeat this line for each entry in /etc/raidtab, filling in proper
> device names.
> 
> raidhotadd /dev/md?? /dev/sdc??
> 
> watch cat /proc/mdstat
> 
> 
> 
> > > I know that in the linux install you can just copy a raid partition
> > > "image" on one disk directly onto another.. what is the command that
is
> > > used to do this by the installer?
> > >
> > > I cant reboot the system, it has to stay up.
> 
> You don't have to.
> 
> 
> -- 
>  Arend
> 


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