dell 2850 initrd problem.
Paul M. Dyer
pmdyer at ctgcentral2.com
Wed Jun 9 10:33:58 CDT 2010
Sorry for the delay. Been busy with things.
If you believe the other LVOL is a filesystem, you can run e2fsck on it also. Yes, the first LVOL may be a swap partition. The "-b 32768" parameter is telling e2fsck to use superblock at location 32768, instead of the default location. If you have a superblock that is corrupt, that command is using the first backup superblock. So, you could try the default, if fails, then the first backup superblock, then the second, ...
"e2fsck -f /dev/mapper/VolGroup00-LogVol00"
first backup superblock:
"e2fsck -f -b 32768 /dev/mapper/VolGroup00-LogVol00"
----- Original Message -----
From: "Ron Croonenberg" <ronc at depauw.edu>
To: "Paul M. Dyer" <pmdyer at ctgcentral2.com>
Cc: "linux-poweredge" <linux-poweredge at dell.com>
Sent: Tuesday, June 8, 2010 9:18:30 AM
Subject: Re: dell 2850 initrd problem.
I managed to move pretty much all data from the 'hosed' machine to
another place. (there are a few things that I would like to salvage but
I would like to make an attempt to fix the filesystem and see if I can
get some more of it.
So if I issue:
"e2fsck -f -b 32768 /dev/mapper/VolGroup00-LogVol01"
because that is the one with the bad superblock? that I found a bit ago
> e2label /dev/mapper/VolGroup00-LogVol01 : bad magic number in
> Group-LogVol01. couldn't find valid filesystem superblock
(although Jefferson mentioned that might be swap)
there is also:
/dev/mapper/VolGroup00-LogVol00 but I thought that was /boot ?
sorry about all the questions, but I am a bit of a rookie with fixing
Paul M. Dyer wrote:
> fine. In rescue mode, you can do debugfs or "e2fsck -f -b 32768.." on
> the /dev/mapper/volume and try to get a good superblock and correct
> the filesystem.
> ----- Original Message -----
> From: "Ron Croonenberg" <ronc at depauw.edu>
> To: "Bond Masuda" <bond.masuda at jlbond.com>
> Cc: "linux-poweredge" <linux-poweredge at dell.com>
> Sent: Friday, June 4, 2010 12:11:53 PM
> Subject: Re: dell 2850 initrd problem.
> I am actually thinking about moving the date to another machine and/or
> put it on another device.
> (the rescue cd gives me the option to activate the network interfaces,
> that way I could scp or ftp it to another machine and inspect the
> retrieved data before anything else.)
> Bond Masuda wrote:
>> On Fri, 2010-06-04 at 12:47 -0400, Ron Croonenberg wrote:
>>> Well here is the thing. We had a 'standby' server that basically
>>> would copy everything every night and in case something bad ever
>>> would happen to the main server we could run it off that one.
>>> However that one got fried during that same power outage.
>>> We also made backups on tape, and guess what.. the server that made
>>> those backups also got fried..
>>> So yes, it is pretty important data, it's pretty much the last
>>> accessible data source we have, so I want to be really careful with
>>> I do have a few other machines that I can use to store data, etc..
>> Wow, sorry to hear about your situation.
>> If this is critically important, and your absolute last resort to
>> recover the data, the first thing I would do is get an image of the
>> entire drive, and also an image of each partition (you can get the
>> partitions from the full image, but i find it easier to have
>> individual partition images for convenience). By image, I'm talking
>> about doing a
>> dd if=/dev/sda ...
>> if you don't have a place to store the images, just run down to the
>> store and buy a 500GB, 1TB, or 2TB external drive of some sort... USB
>> will be rather slow for anything on the order of 100GB's or more, but
>> it still works; just takes time.
>> you can then later make copies of those images to mess with without
>> the worry that you're messing around with your only source of the
>> data. Without the worry, you'll have more options for recovery...
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