[PVE-User] md installer?

Gerald Brandt gbr at majentis.com
Thu Jul 4 20:16:45 CEST 2013


Does anyone know the reasons behind that decision? 

In my experience, Linux software RAID is exceptional in performance and stability. 

Gerald 

----- Original Message -----

> From: "Adam Hunt" <voxadam at gmail.com>
> To: "Paul Gray" <gray at cs.uni.edu>
> Cc: pve-user at pve.proxmox.com
> Sent: Thursday, July 4, 2013 12:46:58 PM
> Subject: Re: [PVE-User] md installer?

> My understanding was that PVE does not now and will never in the
> future support the softraid capabilities of Linux. If RAID is wanted
> than the only option is old-school hardware RAID.

> On Thu, Jul 4, 2013 at 5:29 AM, Paul Gray < gray at cs.uni.edu > wrote:

> > On 07/04/2013 06:30 AM, Paul Gray wrote:
> 
> > > I think, I may be wrong, that the Barebone Installer is not
> > > customizable at all, and won't be.
> 

> > The installer is configurable to the extent that any distribution's
> 
> > installer iso is configurable. You just need to know where the
> 
> > installation components are and how they interact.
> 

> > The origin of my question to the list arises from the hints of md
> 
> > support already in the places within the installation.
> 

> > After ISOLINUX expands the initrd and finds its proxmox iso image,
> > the
> 
> > init script invokes /sbin/unconfigured.sh on the ISO mount.
> 

> > In the final acts of /sbin/unconfigured.sh, there's a commented-out
> > line
> 
> > to shut off md device md0, indicating that there was once a time
> > when
> > it
> 
> > was enabled.
> 

> > But there's quite a bit more: For example, after proxmox finds the
> 
> > installation media and starts up X, the installation contiues from
> 
> > openbox/.xinitrc to invoke /usr/bin/proxinstall.
> 

> > Within the /usr/bin/proxinstall script, one finds this code in the
> 
> > probing for disks:
> 

> > foreach my $hd (@$hds) {
> 
> > my ($disk, $devname) = @$hd;
> 
> > next if $devname =~ m|^/dev/md\d+$|;
> 
> > print "found Disk$disk N:$devname\n";
> 
> > }
> 

> > So the installer is specifically excluding md devices when looking
> > for
> 
> > disks.
> 

> > Naturally this begs the question of what would happen if one added
> 
> > modprobe's for md raid support (right after the modprobe of dm_mod
> > in
> 
> > unconfigured.sh), removed the "next if..." line in the proxinstall
> 
> > script above, reconstituted the ISO, and booted it up to "see what
> > happens."
> 

> > It seems that someone else had probably already done this. If no
> > one
> 
> > else has done it then it's likely someone would be willing to offer
> 
> > advice on why enabling support for md devices would be "a bad
> > thing(tm)"
> 
> > or at least offer some insight as to why md devices are
> > specifically
> 
> > avoided in the present installer.
> 

> > --
> 
> > Paul Gray -o)
> 
> > 314 East Gym, Dept. of Computer Science /\\
> 
> > University of Northern Iowa _\_V
> 
> > Message void if penguin violated ... Don't mess with the penguin
> 
> > No one says, "Hey, I can't read that ASCII attachment ya sent me."
> 
> > _______________________________________________
> 
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> 
> > pve-user at pve.proxmox.com
> 
> > http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-user
> 

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