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

[christoffer@xxxxxxxxx]

Usually, when there is mention of LVM and Xen, it refers to domU:s stored
in LV:s on the dom0. I see no reference to LVM in your domU config and
conclude that you have created a VG *in your domU*, which you want to boot
from? Can't help you there, but you may want to check The Linux
Documentation Project (TLDP). They have a howto on LVM which I think
includes how to boot from LVM. If I remember correctly, there are a few
steps you have to take to make it work.

Cheers,
/Chris

> 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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>



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