LinuxQuestions.org
View the Most Wanted LQ Wiki articles.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Software
User Name
Password
Linux - Software This forum is for Software issues.
Having a problem installing a new program? Want to know which application is best for the job? Post your question in this forum.

Notices

Reply
 
Search this Thread
Old 02-28-2011, 10:21 AM   #1
Jezzirolk
LQ Newbie
 
Registered: Sep 2009
Posts: 21

Rep: Reputation: 0
Angry RAID 5 data loss for weird reasons


ok so i ran into an interesting problem this weekend and wondering if i did something to cause it or not or why it might have happened.

so lets go back a few months in October i built this RAID 5 array using mdadm that included 4 1 TB Hitachi disks and copied a bunch of data (200 GB) from my old data drive to my shiny new RAID array. that went all fine and then later i got a bunch of data from some and copied it onto my array.

fast forward to this weekend. i was fooling around behind my systems and accidentally pulled the plug on my server. when it restarted one of the disks dropped out of the array for some reason. so i lated added it back and it resynced it and thought was all fine and dandy but i was wrong. i went to watch a movie on my server and any of the movies that i copied over in that second wave dont work outright or are very skippy or are a full file size but are only 4 or 5 seconds long but all of the data that came over in the first wave is totally fine. i have watched many movie from the first wave since then and they are completely fine.

any idea what would have caused that to happen why the old data would be fine but the new data is all corrupt in some way. its just kinda angering to have to copy this data back from friends when the thing thats supposed to make RAID 5 epic is that you have data security of one drive dies but it sadly didn't happen this time. i might put the disks into raid 10 to prevent this from happening again.

any ideas guys?

--Jezzirolk
 
Old 03-02-2011, 03:07 PM   #2
Omnicronos
Member
 
Registered: Oct 2010
Location: N. VA
Distribution: Redhat, CentOS, Solaris
Posts: 40

Rep: Reputation: 12
It could be a number of things. Are you getting I/O errors in /var/log/messages? There also could have been network errors when you originally copied the data. Do you have any checksum files you can verify like this:

http://linux.byexamples.com/archives...ecksum-how-to/

Last edited by Omnicronos; 03-09-2011 at 10:49 AM.
 
  


Reply

Tags
data recovery, raid


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Data loss while copying . . . yashsaxena Linux - Newbie 1 01-27-2011 12:32 AM
Data Loss. YellowSnowIsBad Linux - Newbie 3 12-20-2010 06:08 AM
Replacing RAID-10 (4HDD) without Data Loss sandyirwan Linux - Hardware 1 08-01-2008 07:18 PM
Partition without Data Loss SirJinX Linux - Software 9 08-26-2006 12:25 AM
Help!! loss of data transfer cabinetcrafter Mandriva 0 05-15-2004 10:42 PM


All times are GMT -5. The time now is 11:34 PM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration