On Sat, Jul 30, 2011 at 6:40 PM, Sean Hart <tevesxh@xxxxxxxxx> wrote:
> On Sat, Jul 30, 2011 at 7:40 AM, Alexander Dalloz <ad+lists@xxxxxxxxx> wrote:
>> Am 30.07.2011 10:37, schrieb Sean Hart:
>>> So here goes...
>>> First some back story
>>> -Centos 5 with latest updates as of yesterday. kernel is
>>> 2.6.18-238.19.1.el5
>>> -setup is raid 1 for /boot and lvm over raid6 for everything else
>>>
>>> - The / partition (lvm "RootVol") had run out of room... (100%
>>> full, things where falling appart...)
>>>
>>> I resized the root volume (from 20GiB to 50GiB). This was done from a
>>> fedora 15 livecd, seemed like a better idea than doing it on a live
>>> system at the time.... After the resize the content of all the lvs
>>> could be mounted and all data was still there (all this from within
>>> fedora).
>>
>> You would better have used the CentOS 5 install media to run into rescue
>> mode and then to chroot into the system, given you felt better to do an
>> offline resizing. Though online resizing (increasing an LV) is trouble
>> free from my experience. Well, if / is completely full the offline route
>> may indeed be better.
>>
>>> The problem is when i try to reboot into centos as the root volume
>>> cannot be found.
>>>
>>> boot message goes as follows
>>>
>>> ...
>>> No Volume groups found
>>> Volume Group "RaidVolGrp" not found
>>> ...
>>> Kernel panic
>>>
>>>
>>> the UUID's have not changed, but there is definitely a missing link,
>>> probably something dumb...
>>>
>>> I would greatly appreciate if anyone could help point me in the right
>>> direction..
>>>
>>> a bit more info
>>>
>>> # lvscan
>>> ACTIVE '/dev/RaidVolGrp/RootVol' [50.00 GiB] inherit
>>> ACTIVE '/dev/RaidVolGrp/HomeVol' [250.00 GiB] inherit
>>> ACTIVE '/dev/RaidVolGrp/SwapVol' [2.44 GiB] inherit
>>> ACTIVE '/dev/RaidVolGrp/MusicVol' [350.00 GiB] inherit
>>> ACTIVE '/dev/RaidVolGrp/VideoVol' [350.00 GiB] inherit
>>> ACTIVE '/dev/RaidVolGrp/PicturesVol' [300.00 GiB] inherit
>>> ACTIVE '/dev/RaidVolGrp/MiscVol' [60.00 GiB] inherit
>>> ACTIVE '/dev/RaidVolGrp/ShareddocVol' [60.00 GiB] inherit
>>> ACTIVE '/dev/RaidVolGrp/VMVol' [60.00 GiB] inherit
>>> ACTIVE '/dev/RaidVolGrp/TorrentVol' [50.00 GiB] inherit
>>
>> That is output from running the Fedora LiveCD?
>>
>> Boot up with the CentOS 5 DVD into rescue mode, let it detect the
>> existing LVMs. Go into /etc/lvm/backup and validate the info that's
>> saved there and to check what CentOS sees.
>>
>>> sh
>>
>> Alexander
>>
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>>
>
> Ok, thanks a lot for the reply
>
> I believe this is the relevant part of /etc/lvm/backup
> ####################################################
> RaidVolGrp {
> id = "gL5X13-q4c8-d8XJ-x6Qc-m36S-eCfp-LKnvIW"
> seqno = 22
> status = ["RESIZEABLE", "READ", "WRITE"]
> flags = []
> extent_size = 65536 # 32 Megabytes
> max_lv = 0
> max_pv = 0
> metadata_copies = 0
>
> physical_volumes {
>
> pv0 {
> id = "BpXoKc-pQYn-zVkU-7HyH-IKLw-0IX2-Ygm2HJ"
> device = "/dev/md1" # Hint only
>
> status = ["ALLOCATABLE"]
> flags = []
> dev_size = 7805081216 # 3.63452 Terabytes
> pe_start = 384
> pe_count = 119096 # 3.63452 Terabytes
> }
> }
>
> logical_volumes {
>
> RootVol {
> id = "AWstlr-xw8t-FNTu-FsEA-YUxi-updp-0HfKtr"
> status = ["READ", "WRITE", "VISIBLE"]
> flags = []
> segment_count = 1
>
> segment1 {
> start_extent = 0
> extent_count = 625 # 19.5312 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
> stripes = [
> "pv0", 16250
> ]
> }
> }
> #################################
>
> And this is what i get when i run lvdisplay from the centos live-cd
> lvdisplay
> --- Logical volume ---
> LV Name /dev/RaidVolGrp/RootVol
> VG Name RaidVolGrp
> LV UUID AWstlr-xw8t-FNTu-FsEA-YUxi-updp-0HfKtr
> LV Write Access read/write
> LV Status available
> # open 1
> LV Size 50.00 GB
> Current LE 1600
> Segments 2
> Allocation inherit
> Read ahead sectors auto
> - currently set to 4096
> Block device 253:2
>
> .....
>
> ##########################
> It looks like what has changes is the segment count (went from 1 to 2
> segments) for the logical volume "RootVol" (and also the total number
> of segments of pv0 has changed from 22 to 23 i suppose)
>
> ########################
> pvdisplay fom centos live-cd
> Scanning for physical volume names
> --- Physical volume ---
> PV Name /dev/md126
> VG Name RaidVolGrp
> PV Size 3.63 TB / not usable 2.81 MB
> Allocatable yes
> PE Size (KByte) 32768
> Total PE 119096
> Free PE 70058
> Allocated PE 49038
> PV UUID BpXoKc-pQYn-zVkU-7HyH-IKLw-0IX2-Ygm2HJ
>
>
> Not sure what to do from here
> Should I change the /etc/lvm/backup/RaidVolGrp file to reflect the
> current actuall situation? Don't see how that would help since the
> file is inside the pv that can't be accessed at boot time anyway...
>
> sh
>
Hum it looks like the pv name has also changed from "pv0" to "md126"
Would make a difference?
Thanks again,
sh
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