[linux-lvm] Missing Logical Volumes

[Graham Crowe]

Thanks for the reply, however I had to reboot the server and this has cleared 
the problem. If it reoccurs, then I will save the output as per your suggestion 
(I'd like to find a solution that doesn't involve rebooting as this server has 
many Xen virtual machines which are a pain to reboot).


Thanks for your help.


On 25/12/2014 12:51 AM, mghofran at bidmc.harvard.edu wrote:
> If your VG was not activated to begin with, you could not see any LV at all so "vgchange -a y" was not the way to go.
>
> If you still have the issue, please attach the results of:
>
> # vgdisplay -v /dev/array1
> # grep -I filter /etc/lvm/lvmconf
> # vgscan
> # ls -al /dev/mapper
>
>
> -----Original Message-----
> From: linux-lvm-bounces at redhat.com [mailto:linux-lvm-bounces at redhat.com] On Behalf Of G Crowe
> Sent: Friday, December 19, 2014 6:08 PM
> To: LVM general discussion and development
> Subject: Re: [linux-lvm] Missing Logical Volumes
>
>
> No, this didn't work.
>
> [root at host1 ~]# vgchange -ay array1
>     29 logical volume(s) in volume group "array1" now active
>
> And the missing /dev/mapper files were not created (I left one LV un-fixed to try any suggested solutions)
>
> All of the other LVs in the same VG are completely usable, so it doesn't seem to be a problem with the VG as a whole.
>
>
> Thanks
>
> GC
>
>
> On 20/12/2014 3:46 AM, Jack Waterworth wrote:
>> It sounds like the VG was not activated. You can activate it with the
>> following command:
>>
>>      # vgchange -ay array1
>>
>>    Jack Waterworth, Red Hat Certified Architect
>>    Senior Storage Technical Support Engineer
>>    Red Hat Global Support Services ( 1.888.467.3342 )
>>
>> On 12/19/2014 05:32 AM, G Crowe wrote:
>>> After rebooting, some of my logical volumes did not have device files.
>>>
>>> /dev/array1/LVpics
>>> and
>>> /dev/mapper/array1-LVpics
>>> did not exist but the output of "lvdisplay" said that the volume was
>>> available (see below).
>>>
>>> vgscan did not resolve the problem.
>>>
>>> I was able to regain access to the LV by renaming it, then renaming
>>> it back...
>>> [root at host1 ~]# lvrename /dev/array1/LVpics /dev/array1/LVpicsnew
>>>    Renamed "LVpics" to "LVpicsnew" in volume group "array1"
>>> [root at host1 ~]# lvrename /dev/array1/LVpicsnew /dev/array1/LVpics
>>>    Renamed "LVpicsnew" to "LVpics" in volume group "array1"
>>>
>>> There are 29 LVs in the VG and 25 of them came up OK and 4 had this
>>> problem. Note that there is only one single PV (a RAID6 array) in the
>>> VG, and there are two VGs on the machine.
>>>
>>> Is this expected behaviour, or is it something I should be worried
>>> about?
>>>
>>>
>>>
>>>    --- Logical volume ---
>>>    LV Path                /dev/array1/LVpics
>>>    LV Name                LVpics
>>>    VG Name                array1
>>>    LV UUID                WH7g9u-Ls7J-fIpQ-Hk2p-mUuH-QRKf-9uxcM2
>>>    LV Write Access        read/write
>>>    LV Creation host, time example.com, 2013-11-26 07:29:51 +1100
>>>    LV Status              available
>>>    # open                 0
>>>    LV Size                350.00 GiB
>>>    Current LE             89600
>>>    Segments               2
>>>    Allocation             inherit
>>>    Read ahead sectors     auto
>>>    - currently set to     256
>>>    Block device           253:9
>>>
>>>
>>> I am running Fedora 19 with kernel 3.11.9-200.fc19.x86_64
>>>
>>>
>>> Thanks
>>>
>>> GC
>>>
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