On Sat, Oct 8, 2011 at 4:31 PM, William Warren <
hescominsoon@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> On 10/8/2011 3:14 PM, Trey Dockendorf wrote:
> > On Sat, Oct 8, 2011 at 2:04 PM, Steve Brooks<steveb@xxxxxxxxxxxxxxxx
> >wrote:
> >
> >> On Sat, 8 Oct 2011, Trey Dockendorf wrote:
> >>
> >>> I just upgraded my home KVM server to CentOS 6.0 CR to make use of the
> >>> latest libvirt and now my RAID array with my VM storage is missing. It
> >>> seems that the upgrade to mdadm-3.2.2 is the culprit.
> >>>
> >>> This is the output from mdadm when scanning that array,
> >>>
> >>> # mdadm --detail --scan
> >>> ARRAY /dev/md0 metadata=imsm UUID=734f79cf:22200a5a:73be2b52:3388006b
> >>> ARRAY /dev/md126 metadata=imsm UUID=3d135942:f0fad0b0:33255f78:29c3f50a
> >>> mdadm(IMSM): Unsupported attributes : 40000000
> >>> mdadm: IMSM metadata loading not allowed due to attributes
> >> incompatibility.
> >>> mdadm(IMSM): Unsupported attributes : 40000000
> >>> mdadm: IMSM metadata loading not allowed due to attributes
> >> incompatibility.
> >>> ARRAY /dev/md127 container=/dev/md0 member=0
> >>> UUID=734f79cf:22200a5a:73be2b52:3388006b
> >>>
> >>> The error about IMSM shows up on google as something that happened to
> >> Fedora
> >>> users during a FC14->FC15 upgrade.
> >>>
> >>> The server itself isn't old, it's a Supermicro 2U with Dual Xeon 5400
> >> family
> >>> of CPU. There are two RAIDs on this one controller...a RAID1 which
> still
> >>> functions and a RAID5 which is the one that is unable to be seen. I
> >> don't
> >>> know what IMSM is for, but the only thing strange about that array is
> it
> >> is
> >>> 2.7TB so the BIOS configured it as two separate arrays, one as 2TB and
> >> one
> >>> as 700GB, but it was showing up to CentOS as a single volume.
> >>>
> >>> I downgraded to 3.2.1 , ran mdadm again and bam...it works,
> >>>
> >>> # mdadm --detail --scan
> >>> ARRAY /dev/md0 metadata=imsm UUID=734f79cf:22200a5a:73be2b52:3388006b
> >>> ARRAY /dev/md126 metadata=imsm UUID=3d135942:f0fad0b0:33255f78:29c3f50a
> >>> ARRAY /dev/md127 container=/dev/md0 member=0
> >>> UUID=691f975d:6beecfd8:67b39886:b7ee7f6e
> >>>
> >>> Hopefully this can be fixed before this version makes it to 6.1, though
> >> it's
> >>> likely a problem for upstream RHEL as well.
> >>>
> >>> - Trey
> >>> _______________________________________________
> >>> CentOS mailing list
> >>> CentOS@xxxxxxxxxx
> >>> http://lists.centos.org/mailman/listinfo/centos
> >>
> >>
> >> Hmm I recall seeing something like this on an "sl6" box. I think it
> needed
> >> a "/etc/mdadm.conf" with som metadata id code.. I am pretty sure I fixed
> >> it with
> >>
> >> mdadm --detail --scan>> /etc/mdadm.conf
> >>
> >> and a reboot.
> >>
> >> Steve
> >> _______________________________________________
> >> CentOS mailing list
> >> CentOS@xxxxxxxxxx
> >> http://lists.centos.org/mailman/listinfo/centos
> >>
> > That's the problem, mdadm --detail --scan throws errors. After updating
> to
> > mdadm-3.2.2 , and rebooting, the entry /dev/md126 was removed, likely
> > because when I run it and don't pipe the output, it shows this...
> >
> > # mdadm --detail --scan
> > ARRAY /dev/md0 metadata=imsm UUID=734f79cf:22200a5a:73be2b52:3388006b
> > ARRAY /dev/md126 metadata=imsm UUID=3d135942:f0fad0b0:33255f78:29c3f50a
> > mdadm(IMSM): Unsupported attributes : 40000000
> > mdadm: IMSM metadata loading not allowed due to attributes
> incompatibility.
> > mdadm(IMSM): Unsupported attributes : 40000000
> > mdadm: IMSM metadata loading not allowed due to attributes
> incompatibility.
> > ARRAY /dev/md127 container=/dev/md0 member=0
> > UUID=734f79cf:22200a5a:73be2b52:3388006b
> > _______________________________________________
> > CentOS mailing list
> > CentOS@xxxxxxxxxx
> > http://lists.centos.org/mailman/listinfo/centos
> why bother with bios FAKERAID using PIO mode(effectively). Make a
> backup and redo using MD raid and turn off the bios raid. Then things
> will work correctly.
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> CentOS mailing list
> CentOS@xxxxxxxxxx
> http://lists.centos.org/mailman/listinfo/centos
>
I did the downgrade it it worked fine after.
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