[CentOS] Duplicate PV on HW RAID?

Ross S. W. Walker RWalker at medallion.com
Mon Jul 28 17:39:44 UTC 2008

Eduardo Grosclaude wrote:
> Hello, 
> My "hardware" (?) RAID system seems to work but says 
> "duplicate PV" while booting, I don't think I was reading 
> them before. Any clues will be appreciated. 
> From what I recall:
> 1) RAID 1 was setup (using firmware setup program) on a 
> machine with Intel S3200 SHV Server Board. 
> 2) Installed Centos 5.1, default LVM style. Anaconda saw a 
> single 500GB disk so I assumed this was a true hardware RAID 
> system. Am I wrong here? 
> 3) Then wanted to reduce LogVol00 so as to make room for a 
> new, data only filesystem on its own LV. Started by booting 
> with rescue CD, lvscanned the disk, lvchanged -a y. Intended 
> to resize root filesystem with resize2fs. Was asked to fsck, 
> which I did (by the way, getting many errors). Fixed them all 
> (fingers crossed), fsck again said ok. Then resize2fs worked happily. 
> 4) Rebooted the installed system. Now "Duplicate PV" shows at 
> boot. Honestly I don't know whether this was being displayed 
> before (this is an inherited server). This message shows at 
> the screen but no record of it is kept on any log file.
> 5) Everything seems to work well anyway. I created a new LV 
> as I wished, just this message keeps me thinking...
> Should I care? Should I fix it? Is it a true RAID board? 
> Should I be better off going software-RAID 1?
> lspci says 

More informative output would be:

# sfdisk -d
# pvs
# vgs

There might be a disk from an old RAID1 set in there.


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