[clue] Ack! (recovering busted disks - (fixed)

Mike Bean beandaemon at gmail.com
Tue Apr 26 14:40:03 MDT 2016


xfs.  Fiddling with it.  It's completely possible/plausible it could be a
bad superblock


On Tue, Apr 26, 2016 at 2:32 PM, Charles Burton <charles.d.burton at gmail.com>
wrote:

> Oh, what filesystem is it too?  I know xfs has special tools for dealing
> with it.
>
> On Tue, Apr 26, 2016 at 8:31 PM, Charles Burton <
> charles.d.burton at gmail.com> wrote:
>
>> This was done on Fedora 23 with LVM for everything except /boot as well.
>> Dump runs on the VFS layer not the device layer, LVM is technically device
>> layer think of it like this:
>>
>> file -> filesysystem -> lvm -> device
>>
>> Dump operates at the filesystem layer, so getting a bad superblock means
>> that you likely actually have a bad superblock.  Try running fsck against
>> that filesystem and see what you get.
>>
>>
>> On Tue, Apr 26, 2016 at 8:19 PM, Charles Burton <
>> charles.d.burton at gmail.com> wrote:
>>
>>> If you want you can also add compression:
>>>
>>> dump -0u -f - /home/mbean | gzip > /mnt/mbean.dump.gz
>>>
>>> On Tue, Apr 26, 2016 at 8:16 PM, Charles Burton <
>>> charles.d.burton at gmail.com> wrote:
>>>
>>>> I just verified that it works fine on LVM.  It should look like this:
>>>>
>>>> dump -0u -f /mnt/mbean.dump /home/mbean
>>>>
>>>> The /mnt/mbean.dump is the destination file to dump to.  The
>>>> /home/mbean is filesystem you wish to dump from.
>>>>
>>>> On Tue, Apr 26, 2016 at 8:10 PM, Mike Bean <beandaemon at gmail.com>
>>>> wrote:
>>>>
>>>>> Sure looks that way.  Works on physical devices, didn't seem to care
>>>>> for my syntax.   It's dump -0u -f (destination) (source)?
>>>>>
>>>>>
>>>>>
>>>>> On Tue, Apr 26, 2016 at 2:08 PM, Charles Burton <
>>>>> charles.d.burton at gmail.com> wrote:
>>>>>
>>>>>> It doesn't work quite like you're thinking.  Dump doesn't care about
>>>>>> LVM, not at least as far as I know.  Try:
>>>>>>
>>>>>> dump -0u -f /mnt/mbean /home/mbean
>>>>>>
>>>>>> On Tue, Apr 26, 2016 at 8:04 PM, Mike Bean <beandaemon at gmail.com>
>>>>>> wrote:
>>>>>>
>>>>>>> Thanks for the tip.   At least at first blush it looks like I can't
>>>>>>> use dump and restore.   They only work on devices and not on logical
>>>>>>> volumes.  At least not on my logical volumes (I'm getting bad magic number
>>>>>>> in super-block.)   I think I'm going to play with it a  little while
>>>>>>> longer, see if I can figure out if it really can't handle or if I'm just
>>>>>>> PEBKAC.   Could also be this box.  I'm testing it on a box that I don't
>>>>>>> really care if it breaks
>>>>>>>
>>>>>>> dump -0u -f /mnt/mbean /dev/mapper/rootvg-homelv
>>>>>>>   DUMP: Date of this level 0 dump: Tue Apr 26 14:00:16 2016
>>>>>>>   DUMP: Dumping /dev/mapper/rootvg-homelv (/home) to /mnt/mbean
>>>>>>> /dev/mapper/rootvg-homelv: Bad magic number in super-block while
>>>>>>> opening filesystem
>>>>>>>   DUMP: The ENTIRE dump is aborted.
>>>>>>>
>>>>>>> Mike B
>>>>>>>
>>>>>>> On Mon, Apr 25, 2016 at 12:34 PM, Chris Fedde <chris at fedde.us>
>>>>>>> wrote:
>>>>>>>
>>>>>>>> I say this every time backups get mentioned but I have to say it
>>>>>>>> again.  I like dump.  Dump and restore are a perfect set of tools that
>>>>>>>> solve the backup problem neatly and flexibly.  And so far have not let me
>>>>>>>> down for either fat finger recovery or for full disk recovery.
>>>>>>>>
>>>>>>>> I find it silly that this tool that is integrated with the OS and
>>>>>>>> woks so well is overlooked by everyone. Even by the certification folks.
>>>>>>>>
>>>>>>>> Let me say it again.  I like dump. Maybe I need to write up a blog
>>>>>>>> article or something.
>>>>>>>> On Apr 19, 2016 6:33 PM, "Mike Bean" <beandaemon at gmail.com> wrote:
>>>>>>>>
>>>>>>>>> Yeah, I know ; )
>>>>>>>>>
>>>>>>>>> Mike B
>>>>>>>>>
>>>>>>>>> On Tue, Apr 19, 2016 at 3:49 PM, David L. Anselmi <
>>>>>>>>> anselmi at anselmi.us> wrote:
>>>>>>>>>
>>>>>>>>>> Mike Bean wrote:
>>>>>>>>>> > Theorhetically yes, and we did that, but as predicted, since I
>>>>>>>>>> #1 noticed
>>>>>>>>>> > the box was down and #2 attempted to fix it, I therefore have
>>>>>>>>>> ownership of
>>>>>>>>>> > it now.   Have to look into a cheap scale able method to get
>>>>>>>>>> actual backups
>>>>>>>>>> > and stop depending on snap shots.   I suppose I could just back
>>>>>>>>>> it up.  But
>>>>>>>>>> > it's only a matter of time before someone notices the Jenkins
>>>>>>>>>> box has
>>>>>>>>>> > backups and complains that all the other boxes don't.
>>>>>>>>>>
>>>>>>>>>> You need to get a new job. Life's too short...
>>>>>>>>>>
>>>>>>>>>> And for everyone else, this is an example why you vote against
>>>>>>>>>> whatever the government wants to
>>>>>>>>>> spend money on.
>>>>>>>>>>
>>>>>>>>>> Dave
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>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
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>>>>>>>>
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>>>>>>>
>>>>>>>
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>>>>>
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>
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