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

Thu Apr 28 10:03:08 MDT 2016

No worries.  I've had a ton of experiences where something might not
necessarily solve the current problem, but it comes up six months or even
years down the road.  Never know when you might need something.

On Tue, Apr 26, 2016 at 5:55 PM, Chris Fedde <chris at fedde.us> wrote:

> To my knowledge dump does not work with "advanced" file systems (xfs, zfs,
> btrfs).  They have their own tools.
> Sorry I pointed you at tools that are not going to work for you.  It looks
> lie there is an xfsdump available.
> I have no experience with it but the manual page is encouraging.
>
> chris
>
> On Tue, Apr 26, 2016 at 2:48 PM, Charles Burton <
> charles.d.burton at gmail.com> wrote:
>
>> Yeah, for xfs there's a whole suite of tools that aren't what you would
>> normally expect.
>>
>> xfreerdp       xfs_db         xfs_growfs     xfs_mdrestore  xfs_quota
>> xfs_admin      xfs_estimate   xfs_info       xfs_metadump   xfs_repair
>> xfs_bmap       xfs_freeze     xfs_io         xfs_mkfile     xfs_rtcp
>> xfs_copy       xfs_fsr        xfs_logprint   xfs_ncheck
>>
>> All part of the xfsprogs. You can't use the linux dump command either,
>> you have to install and use xfsdump.
>>
>> On Tue, Apr 26, 2016 at 8:40 PM, Mike Bean <beandaemon at gmail.com> wrote:
>>
>>> 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
>>>>>>>>>>>>> _______________________________________________
>>>>>>>>>>>>> clue mailing list: clue at cluedenver.org
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>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
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>>>>>>>>>>>
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>>>>>>>>>>
>>>>>>>>>>
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>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
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>>>>>>>>
>>>>>>>>
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>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
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>>>
>>>
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>>
>>
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>
>
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