Re: [Xen-users] guest boots sucessfully only one time then lvm complains no uuid found

[Vu Pham <vu@xxxxxxxxxx>]

christoffer@xxxxxxxxx wrote:
> It should be possible - I do precisely that: LVM on software raid1. I
> think more detail is needed. What are your device names and what do you
> export to your domU?
>
> Cheers,
> /Chris
>
> > I set up a guest ( under RHEL5 dom0) that has a root volume group
> > extends onto /dev/md which is a raid 1.
> >
> > The first time after setting it up, that guest boots just fine but the
> > next reboot will panic with the root lvm cannot the uuid of the /dev/md0.
> >
> > Because I have a backup of that image, so I can restore and restart it
> > again but then even without doing anything, the next reboot will panic.
I do not have problem when my main VG ( the VG that has the LV 
containing the / partition ) is built directly on the /dev/md0. I have 
another guest with that configuration and it runs just fine.
This guest with problem has the main VG built just on one drive and it 
boots normally. Then I build the /dev/md0 on two other drives, and 
*extend* the main VG into this /dev/md0 's PV : just extend the VG, not 
yet resize the LV inside it. I did run mdadm --detail --scan > 
/etc/mdadm.conf.
The first time I boot, the LVM can see /dev/md0 and its PV, so the VG is 
found ok. The 2nd time I boot, it complains no UUID ( for /dev/md0 )is 
found. All of the below configuation output is from the first boot:
Below is my guest config:

[root@xen2 ~]# more /etc/xen/g1
name = "g1"
uuid = "2731f3ac-3bde-7105-46b9-794004cb3894"
maxmem = 1024
memory = 1024
vcpus = 1
bootloader = "/usr/bin/pygrub"
on_poweroff = "destroy"
on_reboot = "restart"
on_crash = "restart"
vfb = [  ]
disk = [ "tap:aio:/data/xen/images/g1.img,xvda,w", 
"tap:aio:/data/xen/images/g1_
b.img,xvdb,w","tap:aio:/data/xen/images/g1_c.img,xvdc,w" ]
vif = [ "mac=00:16:3e:6e:35:77,bridge=xenbr0" ]

[root@g1 ~]# vgdisplay -v
    Finding all volume groups
    Finding volume group "g1volgroup00"
  --- Volume group ---
  VG Name               g1volgroup00
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  25
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               2
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               10.04 GB
  PE Size               8.00 MB
  Total PE              1285
  Alloc PE / Size       1266 / 9.89 GB
  Free  PE / Size       19 / 152.00 MB
  VG UUID               EFxLNW-31H9-lyLD-oprg-UvLB-lVNF-3Qv6zG

  --- Logical volume ---
  LV Name                /dev/g1volgroup00/lvroot
  VG Name                g1volgroup00
  LV UUID                y8C8j8-Ar8C-py5x-OL2E-K5zS-yqft-4vXDWU
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                8.89 GB
  Current LE             1138
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

  --- Logical volume ---
  LV Name                /dev/g1volgroup00/lvswap
  VG Name                g1volgroup00
  LV UUID                UTPDI8-LAGf-Tvp6-lLfD-vi6p-0RUv-S0rdKo
  LV Write Access        read/write
  LV Status              available
  # open                 1
  LV Size                1.00 GB
  Current LE             128
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1

  --- Physical volumes ---
  PV Name               /dev/xvda2
  PV UUID               H0owWs-k8Li-w0Mb-3CgN-5gsM-haJy-BYYkrh
  PV Status             allocatable
  Total PE / Free PE    1266 / 0

  PV Name               /dev/md0
  PV UUID               4m2GFx-QDv0-Gb8q-qxAG-QMIc-If9i-b1ge12
  PV Status             allocatable
  Total PE / Free PE    19 / 19

[root@g1 ~]# pvscan
  PV /dev/xvda2   VG g1volgroup00   lvm2 [9.89 GB / 0    free]
  PV /dev/md0     VG g1volgroup00   lvm2 [152.00 MB / 152.00 MB free]
  Total: 2 [10.04 GB] / in use: 2 [10.04 GB] / in no VG: 0 [0   ]

[root@g1 ~]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/xvda2
  VG Name               g1volgroup00
  PV Size               9.90 GB / not usable 6.76 MB
  Allocatable           yes (but full)
  PE Size (KByte)       8192
  Total PE              1266
  Free PE               0
  Allocated PE          1266
  PV UUID               H0owWs-k8Li-w0Mb-3CgN-5gsM-haJy-BYYkrh

  --- Physical volume ---
  PV Name               /dev/md0
  VG Name               g1volgroup00
  PV Size               156.19 MB / not usable 4.19 MB
  Allocatable           yes
  PE Size (KByte)       8192
  Total PE              19
  Free PE               19
  Allocated PE          0
  PV UUID               4m2GFx-QDv0-Gb8q-qxAG-QMIc-If9i-b1ge12

[root@g1 ~]# mdadm --detail /dev/md0
/dev/md0:
        Version : 00.90.03
  Creation Time : Sat Jan 17 11:11:37 2009
     Raid Level : raid1
     Array Size : 159936 (156.21 MiB 163.77 MB)
  Used Dev Size : 159936 (156.21 MiB 163.77 MB)
   Raid Devices : 2
  Total Devices : 2
Preferred Minor : 0
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Sun Jan 18 13:10:00 2009
          State : active
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           UUID : f38cb367:f475b06c:d2f4e2c1:3c452b16
         Events : 0.6

    Number   Major   Minor   RaidDevice State
       0     202       16        0      active sync   /dev/xvdb
       1     202       32        1      active sync   /dev/xvdc
[root@g1 ~]#




Thanks,

Vu

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