[CentOS] Disk accounting with LVM Snapshots

Thu May 17 19:35:38 UTC 2007
Mike Fedyk <mfedyk at mikefedyk.com>

https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=240476

Mike Fedyk wrote:
> Hi,
> 
> I was reading a lot of data from one LVM logical volume and wanted to 
> watch the disk statistics with iostat today.  To my surprise, I was 
> seeing the same activity on two logical volumes (LV) and the physical 
> disk containing the two.
> 
> A little investigation showed that one LV was a snapshot of the other, 
> and I was reading from one of the snapshots.
> 
> While I understand that the two LVs share some common Logical Extents 
> (LE), I believe it is a bug that the disk statistics show the activity 
> on both logical volumes.
> 
> Should I report this in the centos bugzilla or upstream's bts?
> 
> Thanks,
> 
> Mike Fedyk
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