[Linux-cluster] How to re-store my lost data

[Thomas Sjolshagen]

 We'd need to know how your storage is configured.

 Everything from how storage is connected to the system (if it's 
 external) or if you're using an internal RAID controller. What sort of 
 mirroring are you using, how many locally connected HDD drives do you 
 have, how are the clustered file systems connected to this system 
 (iSCSI, Fibre Channel, something else), the contents of /etc/fstab, 
 /etc/cluster/cluster.conf, output from the lvm commands (IIRC, #pvs, 
 #lvs and #vgs will work on RHEL to display any LVM configuration 
 hightlights). Also, what version of the cluster stack are you using (and 
 what components - things like chkconfig --list, rpm -qa | grep cman, 
 etc, etc). There are a couple of documents on the web that will provide 
 you with examples/suggestions for the types of data you can/should 
 collect before reporting a problem with the Red Hat Cluster Stack.

 Also, what caused you to change the drive, how did it get changed and 
 was anything done as part of that change in order to get the system back 
 online again.

 If you don't know what you need to look at, I'm not sure you're the 
 optimal person to try and fix this problem. Data recovery can be a 
 fairly low-level thing in the right (wrong) set of circumstances.

 // Thomas

 On Thu, 06 Jan 2011 19:51:18 +0000, Luis Cebamanos <luiceur at gmail.com> 
 wrote:
> Well, there are not backups of that valuable lost data but the
> cluster was using disk mirroring but no one has a clue of how to take
> advantage of that. Nobody here is a cluster expert and that has been
> the problem I guess.
> We haven't really "touch" any important system file, after physically
> installed the hard disk, we realized that the cluster wasn't properly
> working. We rebooted the cluster without the old disks and that has
> been the result.
> Worst scenario, we will need to call an expert, but we think it can
> not be a big deal as I said, we haven't modified the previous
> configuration...
> On 01/06/2011 07:44 PM, Digimer wrote:
>> On 01/06/2011 02:36 PM, Luis Cebamanos wrote:
>>> Is a cluster with 16 nodes and I suspect the problem is in the head 
>>> node:
>>> $cat /proc/version
>>> Linux version 2.6.11.4-21.11-smp (geeko at buildhost) (gcc version 
>>> 3.3.5
>>> 20050117 (prerelease) (SUSE Linux)) #1 SMP Thu Feb 2 20:54:26 GMT 
>>> 2006
>>>
>>> df -T
>>> Filesystem    Type   1K-blocks      Used Available Use% Mounted on
>>> /dev/sda2     ext3    33032228  19971720  11382520  64% /
>>> tmpfs        tmpfs     1027632         0   1027632   0% /dev/shm
>>> /dev/sda1     ext3      124427      9412    108591   8% /boot
>>> /dev/sda6     ext3     2063504     33820   1924864   2% /tmp
>>> /dev/sda9     ext3   166698068 119970708  38259504  76% /users
>>> /dev/sda8     ext3    32250392    966320  29645848   4% /usr/local
>>> /dev/sda7     ext3     2063504    901804   1056880  47% /var
>>>
>>> We were trying to install new hard drives to the system but 
>>> something
>>> that we don't know went wrong and it ended up in almost 4 years of 
>>> work
>>> lost!!!
>>> Please, let me know what else can I do to be able to get the data 
>>> back!
>>>
>>> Best
>> It's a bit late now, but I suppose you don't have backups?
>>
>> As for how to help, what you provided was only marginally helpful. 
>> We
>> need a much more extensive overview of your setup and configuration,
>> versions, etc. before we can have any idea if we can help.
>>
>> In the short term, don't try anything yourself without careful 
>> thought.
>> If the data is very valuable, consider hiring a data recovery firm 
>> near
>> you who can come and look at your setup.
>>
>
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