Boston Linux & Unix (BLU) Home | Calendar | Mail Lists | List Archives | Desktop SIG | Hardware Hacking SIG
Wiki | Flickr | PicasaWeb | Video | Maps & Directions | Installfests | Keysignings
Linux Cafe | Meeting Notes | Blog | Linux Links | Bling | About BLU

BLU Discuss list archive


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: PE2950, RAID 0, failed disk



 On Thu, 2008-03-06 at 16:11 -0500, Ben Holland wrote: 
> Alright, I was going to say something about how RAID 0 just stripes with no 
> parody, a RAID 1 mirrors, so you get a whole drive of redundancy RAID 5 is 
> stripe with parody so you need 3 drives minimum. If you loose a RAID 0 you 
> lost half of your data, you can't recover from it, and chances are you lost 
> all of the other side as well because your file system is totally hosed 
> (though could someone please verify that). 

Yes, that is correct, the file system is completely hosed, you've 
probably got zero chance at recovery without taking the entire array, 
including the original failed disk, to a recovery specialist. 

NEVER EVER EVER use RAID0 for data you can't afford to lose. It should 
only be used when you need high-performance short-term storage (such as 
for a build system or test system that does heavy disk I/O, but the data 
doesn't need to be kept around). 


> On Thu, Mar 6, 2008 at 3:45 PM, Vince Kimball <[hidden email]> wrote: 
> 
> > I believe RAID 0 has no redundancy, so a single drive failure destroys 
> > the volume. 
> > 
> > Scott R. Ehrlich wrote: 
> > > I have a Dell PowerEdge 2950 with PERC 5/i, and 6 disks.  Two disks 
> > > have one logical volume via a hardware RAID 1 and consist of CentOS 5 
> > > 64-bit; the remaining four comprise a logical volume via a hardware 
> > > RAID 0, and is all user data. 
> > > 
> > > One drive on the RAID 0 went bad.   I removed it while the system was 
> > > on, tried a reboot, and the system hangs at RedHat Linux... Starting 
> > > 
> > > I tried to boot from a Fedora 8 CD, which sees the boot drives fine, 
> > > but not the RAID 0 partitions. 
> > > 
> > > Visiting the PERC controller setup claims the RAID 0 volume is 
> > > unavailable, or something similar, though it is defined, with one of 
> > > the disks labelled as missing, since I removed it from the system. 
> > > 
> > > How do I get the partitions on the RAID 0 setup back?   I have some of 
> > > the data, but need the rest, if possible, and the remaining three 
> > > disks appear physically healthy.   I'm also going to work with Dell 
> > > for some answers, and I've done a lot of googling. 
> > > 
> > > Thanks. 
> > > 
> > > Scott 
> > > 
> > 
> > 
> > -- 
> > This message has been scanned for viruses and 
> > dangerous content by MailScanner, and is 
> > believed to be clean. 
> > 
> > _______________________________________________ 
> > Discuss mailing list 
> > [hidden email] 
> > http://lists.blu.org/mailman/listinfo/discuss
> > 
> 


BLU is a member of BostonUserGroups
BLU is a member of BostonUserGroups
We also thank MIT for the use of their facilities.

Valid HTML 4.01! Valid CSS!



Boston Linux & Unix / webmaster@blu.org