Solved

recovering from broken mirror

Posted on 2004-08-09
7
397 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

Optimizing Cloud Backup for Low Bandwidth

With cloud storage prices going down a growing number of SMBs start to use it for backup storage. Unfortunately, business data volume rarely fits the average Internet speed. This article provides an overview of main Internet speed challenges and reveals backup best practices.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
windows explorer 21 172
Server 2012R2 Foundation and Server 2000 3 118
vCenter Converter Standalone 4.01 - Convert Old Server 2000 to VM 4 155
Referencing a mapped drive 6 135
In the hope of saving someone else's sanity... About a year ago we bought a Cisco 1921 router with two ADSL/VDSL EHWIC cards to load balance local network traffic over the two broadband lines we have, but we couldn't get the routing to work consi…
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…
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…
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…

920 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

Need Help in Real-Time?

Connect with top rated Experts

17 Experts available now in Live!

Get 1:1 Help Now