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01/20/2009 at 06:51PM PST, ID: 24069044
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7.8

Recover missing data afer software raid mirror restoration

Asked by m3tech in Computer Hard Drives, Disaster Recovery, Storage Technology

Tags: server 2003, raid, software raid, data, recovery, degraded, rebuild

Yesterday I was alerted to a broken software raid on one of our production servers (Win Server 2003). The mirrored raid contained 1 logical drive (partiion d) containing purely data.

I'm very familiar with hardware raid rebuilding procedures on different hardware, but have never dealt with software raid. I performed the usual steps:

1) Identified problem drive ( in this case it was showing as 'missing' in disk management )
2) Powered down, removed power, and replaced this drive with brand new drive.
3) Booted into Windows, confirmed the new drive was showing up and remaining half of mirrored raid was online.
4) Removed mirror from 'missing' disk, removed 'missing disk', converted new disk to dynamic, and started rebuild of mirror.

Today I was informed a folder (2009 reports) was missing on one of the shares (share contains reports organized in subfolder by year, then month, with daily files) When I investigated I found the ending months of 2008 also missing, and some of the daily excel spreadsheets missing from November. (Last report was on 11/17/08)

After seeing this I checked another folder, and could not find a subfolder I created (probably has not been modified since november). Needless to say I need some idea of what happened by morning. I suspect it may be simply file structure damage, but I'd like additional imput.

I'm including a dmdiag report I ran on the server a few minutes ago.

(maybe I'll finally get the time and budget to flesh out a real disaster recovery plan I've been bringing up since I took over internal network administration...) 
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---------- Consolidated LDM Configuration Data ----------
 
ERROR: scan operation failed:
	A format error was found in the private region of the disk
ERROR: scan operation failed:
	A format error was found in the private region of the disk
 
---------- Dynamic Disk Information -----------
 DiskGroup: TerminalDg0
  Group-ID: df9c218b-57b4-45ca-803f-40b9667f74b9
 
   Sub Disk  Rel Sec    Tot Sec    Tot Size   Plex        Vol Type  Col/Ord  DevName    State  
   ========  =======    =======    ========   ====        ========  =======  =========  ====== 
   Disk1-01  63         976768002  976773168  Volume1-01  Mirror    1/1      Harddisk0  ONLINE 
   LDM-DATA  976771120  2048                                                                   
 
   Disk3-01  63         976768002  976773168  Volume1-02  Mirror    1/1  Harddisk1  ONLINE 
   LDM-DATA  976771120  2048                                                               
 
 ---------- LDM Volume Information -----------
 
   Volume   Volume  Mnt  Subdisk   Plex        Physical    Size       Total      Col  Plex    Rel      Vol     Plex   
   Name     Type    Nme  Name      Name        Disk        Sectors    Size       Ord  Offset  Sectors  State   State  
   ======   ======  ===  ========  ==========  ==========  =======    =======    ===  ======  =======  ======  ====== 
   Volume1  Mirror  D    Disk1-01  Volume1-01  Harddisk0   976768002  976768002  1/1  0       63       ACTIVE  ACTIVE 
 
 
   Volume   Volume  Mnt  Subdisk   Plex        Physical    Size       Total      Col  Plex    Rel      Vol     Plex   
   Name     Type    Nme  Name      Name        Disk        Sectors    Size       Ord  Offset  Sectors  State   State  
   ======   ======  ===  ========  ==========  ==========  =======    =======    ===  ======  =======  ======  ====== 
   Volume1  Mirror  D    Disk3-01  Volume1-02  Harddisk1   976768002  976768002  1/1  0       63       ACTIVE  ACTIVE
[+][-]01/20/09 07:08 PM, ID: 23426553

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About this solution

Zones: Computer Hard Drives, Disaster Recovery, Storage Technology
Tags: server 2003, raid, software raid, data, recovery, degraded, rebuild
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Solution Provided By: rynox
Participating Experts: 2
Solution Grade: A
 
 
[+][-]01/20/09 08:07 PM, ID: 23426782

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[+][-]02/25/09 04:19 PM, ID: 23740208

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[+][-]02/25/09 05:27 PM, ID: 23740621

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