RAID-10 array won't auto-assemble @ boot of a Xen Guest; Works just fine 'manually' ... Any ideas?

RAID-10 array won't auto-assemble @ boot of a Xen Guest; Works just fine 'manually' ... Any ideas?

[Ben DJ]

Hi

I've had my OpenSuse 11.2 box booting from /boot-on-RAID1 +
everything+else-on-RAID10 for awhile now with no issues.

I recently started experimenting with virtualized servers using Xen.

Piecing together a bunch of disjointed advice/instructions, I've set
up a Guest as a server that I want to use as a RAID-ed NAS.  In the
Guest/NAS the NAS's "/", swap & boot are all raw devices passed from
the Xen Host.

For the NAS storage, I have a Passed-through SATA/JBD pci-card that
I've connected external drives to.

I can boot the Guest, see the PCI card, create a RAID-10 array across
those external drives, create & mount LVMs with FSs on them, and
reqd/write ok.  In other words, everything works just as expected.

Except, after rebooting the Guest, the raid array is not started.  I
can re-assemble it, and rescan/mount the vols on it etc, but can't get
the setup to 'stick' across reboot.  :-/

This is what I've stored for auto-assembly,

cat /etc/mdadm
	DEVICE /dev/sd[abcd]1
	ARRAY /dev/md0 metadata=1.01 name=TESTNAS:0 UUID=b23...


and, from the NAS Guest's logs,

cat boot.msg | grep -i raid
<6>[   20.614724] md: raid0 personality registered for level 0
<6>[   20.618933] md: raid1 personality registered for level 1
<4>[   20.711986] raid6: int64x1   2386 MB/s
<4>[   20.779991] raid6: int64x2   3375 MB/s
<4>[   20.847994] raid6: int64x4   2456 MB/s
<4>[   20.915984] raid6: int64x8   2201 MB/s
<4>[   20.983976] raid6: sse2x1    3581 MB/s
<4>[   21.051979] raid6: sse2x2    5624 MB/s
<4>[   21.119978] raid6: sse2x4    6276 MB/s
<4>[   21.120691] raid6: using algorithm sse2x4 (6276 MB/s)
<6>[   21.123798] md: raid6 personality registered for level 6
<6>[   21.124550] md: raid5 personality registered for level 5
<6>[   21.125245] md: raid4 personality registered for level 4
<6>[   21.129319] md: raid10 personality registered for level 10
<notice -- Dec 16 07:34:54.215943000> service boot.device-mapper
done<notice -- Dec 16 07:34:54.216238000> service boot.dmraid
startWaiting for udev to settle...
Activating dmraid...
no raid disks
<notice -- Dec 16 07:34:54.523702000> service boot.dmraid done<notice
-- Dec 16 07:34:54.524007000> service boot.lvm startSetting up
hostname 'TESTNAS'done

I have no idea what I've missed, or even what to look for here.  I
basically followed the same procedures that work flawlessly for me for
my non-virtualized box. :-/  Any suggestions as to what I need to do
to get the RAID-10 recognized/built @ boot of the Xen Guest?  I have a
nagging suspicion that since this RAID array does not contain "/" or
"root" it's not being 'looked for' ... but nothing to back that up,
yet.

Thanks,

BenDJ

[SOLVED] RAID-10 array won't auto-assemble @ boot of a Xen Guest; Works just fine 'manually' ... Any ideas?

[Ben DJ]

Apparently, when NOT a "/" or "/boot" drive, the RAID arrays need

  chkconfig boot.md on

which, strangely, doesn't show up at all in,

  chkconfig -- list | grep -i boot
    list: unknown service

or,

  man mdadm
  man md

Anyway, array's started on boot now.  Hth someone.

BenDJ

RE: [SOLVED] RAID-10 array won't auto-assemble @ boot of a Xen Guest; Works just fine 'manually' ... Any ideas?

[Guy Watkins]

My guess is that is specific to your distribution.

One of my systems does not even have chkconfig (Debian).  The other does not
have boot.md (FC10).

} -----Original Message-----
} From: linux-raid-owner@vger.kernel.org [mailto:linux-raid-
} owner@vger.kernel.org] On Behalf Of Ben DJ
} Sent: Tuesday, December 15, 2009 8:05 PM
} To: Linux RAID Mailing List
} Subject: [SOLVED] RAID-10 array won't auto-assemble @ boot of a Xen Guest;
} Works just fine 'manually' ... Any ideas?
} 
} Apparently, when NOT a "/" or "/boot" drive, the RAID arrays need
} 
}   chkconfig boot.md on
} 
} which, strangely, doesn't show up at all in,
} 
}   chkconfig -- list | grep -i boot
}     list: unknown service
} 
} or,
} 
}   man mdadm
}   man md
} 
} Anyway, array's started on boot now.  Hth someone.
} 
} BenDJ
} --
} To unsubscribe from this list: send the line "unsubscribe linux-raid" in
} the body of a message to majordomo@vger.kernel.org
} More majordomo info at  http://vger.kernel.org/majordomo-info.html

Re: [SOLVED] RAID-10 array won't auto-assemble @ boot of a Xen Guest; Works just fine 'manually' ... Any ideas?

[Ben DJ]

On Tue, Dec 15, 2009 at 6:25 PM, Guy Watkins
<linux-raid@watkins-home.com> wrote:
> My guess is that is specific to your distribution.
>
> One of my systems does not even have chkconfig (Debian).  The other does not
> have boot.md (FC10).

Good to know.  Not really surprising ... these sort things rarely seem
to be 'standardized', or even well-documented.

Thanks,

BenDJ
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Re: [SOLVED] RAID-10 array won't auto-assemble @ boot of a Xen Guest; Works just fine 'manually' ... Any ideas?

[Robin Hill]

[-- Attachment #1: Type: text/plain, Size: 610 bytes --]

On Tue Dec 15, 2009 at 05:05:18PM -0800, Ben DJ wrote:

> Apparently, when NOT a "/" or "/boot" drive, the RAID arrays need
> 
>   chkconfig boot.md on
> 
> which, strangely, doesn't show up at all in,
> 
>   chkconfig -- list | grep -i boot
>     list: unknown service
> 
What about if you leave out the space between the dashes and the list
option?

Cheers,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <robin@robinhill.me.uk> |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |

[-- Attachment #2: Type: application/pgp-signature, Size: 198 bytes --]

Re: [SOLVED] RAID-10 array won't auto-assemble @ boot of a Xen Guest; Works just fine 'manually' ... Any ideas?

[Ben DJ]

>>   chkconfig -- list | grep -i boot
>>     list: unknown service
>>
> What about if you leave out the space between the dashes and the list
> option?

Still not there.

> chkconfig --list | grep -i boot
>
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Re: [SOLVED] RAID-10 array won't auto-assemble @ boot of a Xen Guest; Works just fine 'manually' ... Any ideas?

[Robin Hill]

[-- Attachment #1: Type: text/plain, Size: 770 bytes --]

On Wed Dec 16, 2009 at 08:10:01AM -0800, Ben DJ wrote:

> >>   chkconfig -- list | grep -i boot
> >>     list: unknown service
> >>
> > What about if you leave out the space between the dashes and the list
> > option?
> 
> Still not there.
> 
> > chkconfig --list | grep -i boot
> >
> 
A check of the manual page shows that on openSUSE, the command would be:
    chkconfig --list --allservices | grep -i boot

Boot services are hidden by default, so you need the --allservices (or
-A) switch to show them.

Cheers,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <robin@robinhill.me.uk> |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |

[-- Attachment #2: Type: application/pgp-signature, Size: 198 bytes --]

Re: [SOLVED] RAID-10 array won't auto-assemble @ boot of a Xen Guest; Works just fine 'manually' ... Any ideas?

[Ben DJ]

> A check of the manual page shows that on openSUSE, the command would be:
>    chkconfig --list --allservices | grep -i boot
>
> Boot services are hidden by default, so you need the --allservices (or
> -A) switch to show them.

Learned something new, thanks.

"Something" auto-enabled those services -- particularly boot.md -- on
the box on which "/" & "/boot" were installed to RAID.  I'm gonna
guess the installation process itself took care of that.

I've yet to find/notice an opensuse doc that says I need to manually
enable that -- with 20-20 hindsight, makes sense.

All working now, and procedure noted.

Thanks.

BenDJ