Solved

recovering from broken mirror

Posted on 2004-08-09
7
398 Views
Last Modified: 2010-04-14
HI,

I would like to recover a server with a mirror that was already broken before the crash.
Does somebody know what is the exact difference between a broken mirror and an operational mirror and how you can boot from an mirror that was broken before a crash?

Niels
0
Comment
Question by:robertoballo
  • 2
7 Comments
 
LVL 14

Accepted Solution

by:
dlwyatt82 earned 168 total points
ID: 11756252
This will depend partially on your RAID implementation (ie, are you running Windows software RAID, or do you have a hardware controller?), but as a general rule, if a RAID 1 (mirror) set is failed or broken, you can treat the remaining functional drive as a single standalone disk until you repair the RAID mirror.

For recovery purposes, just try to recover the disk that was working before the crash, and ignore the other until afterwards.
0
 
LVL 10

Assisted Solution

by:dis1931
dis1931 earned 166 total points
ID: 11756259
Operational Mirror means you have at least two drives that contain the exact same contents.  If you save data it gets replicated on both drives.  If a mirror is purposely broken then the mirroring stops and you have two seperate hard drives.  If a hard drive fails, you would break the mirror and then replace the drive and recreate the mirror so that the working drive can mirror itself to the new drive.  If you broke the mirror and then the PC crashed you basically boot off the one drive in the mirror.  If you had the mirror working and a hard drive failed it would be fault tolerant and would use the working drive,  Is this what you wanted to know?
0
 
LVL 14

Expert Comment

by:dlwyatt82
ID: 11756343
As a clarification, I got the impression that you had a RAID mirror working at some point, then a drive failed, and you left it broken for a period of time. Then you had some sort of system crash (for any reason) while the mirror was still in the broken state, and want to know how to recover your data... if that is accurate, then my my initial comments still apply.
0
 
LVL 22

Assisted Solution

by:Paka
Paka earned 166 total points
ID: 11756613
Do you have a software or hardware mirror.  If it is a software mirror, you'll probably need to modify your boot.ini to point to the other partition depending on which copy of the mirror failed.  If it is a hardware mirror, fix the OS problems (if it is a crash) and then use the hardware controller features to rebuild.
0

Featured Post

Migrating Your Company's PCs

To keep pace with competitors, businesses must keep employees productive, and that means providing them with the latest technology. This document provides the tips and tricks you need to help you migrate an outdated PC fleet to new desktops, laptops, and tablets.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
P2V Windows NT/2000 SP4 3 1,824
Application Deployment 2 257
Windows 7 / Windows 8 casual users can't connect to Win 2000 SBS shares 6 308
Server 2012R2 Foundation and Server 2000 3 124
NTFS file system has been developed by Microsoft that is widely used by Windows NT operating system and its advanced versions. It is the mostly used over FAT file system as it provides superior features like reliability, security, storage, efficienc…
How do we balance the user experience (UX) with reasonable security measures? It can be done, if you keep these fundamentals in mind.
Windows 10 is mostly good. However the one thing that annoys me is how many clicks you have to do to dial a VPN connection. You have to go to settings from the start menu, (2 clicks), Network and Internet (1 click), Click VPN (another click) then fi…
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question