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Re: df, lvm and 6TB arrays oh my!



On Tue, 2006-02-14 at 11:58 -0500, Mark Haney wrote:
> Mark Haney wrote:
> >>>  
> >>
> >> Well, now we're in the not so good news....
> >>
> >> Just doing the math....
> >>
> >> (Block count * Block size) / 1024^4
> >> (632648704 * 4096) / 1024^4 = 2.35 TB
> >>
> >> So, what you are seeing in df is accurate as far as the filesystem is
> >> concerned....
> >>
> >> So, my thoughts are that perhaps someone originally created the logical
> >> volumes at 2.4TB, created the filesystems, and then tried to extend the
> >> logical volumes with lvextend?  Of course, while lvextend will grow the
> >> underlying logical volume it does not grow the filesystem.  That is done
> >> with the ext2online command, if the filesystem is mounted, and with
> >> resize2fs if the filesystem is unmounted.
> >>
> >> Can you check to see which of those two utilities you have available in
> >> FC2?  Whether you have both resize2fs and ext2online?  Of course,
> >> resizing the filesystem is potentially dangerous and presumes good
> >> quality backups, and read, lots of disclaimers at this point about
> >> eating your data for lunch......
> >>
> >> --Rob
> >>
> >>
> >>   
> > I created the volumes myself, all at once.  I verified the size of the 
> > volume at each step. I had thought that it's possible that ext3 only 
> > formatted the 2.4TB extent and that resizing it might work.  
> > Fortunately I have one of these volumes not in use so I can test that 
> > and see how it goes.  Thanks for all your help on this.
> >
> >
> Just an update on this.  It seems as if the mke2fs version that comes 
> with FC2 when used with a large lvm volume will only create the fs up to 
> 2TB.  When I used resize2fs on the volume the system extended the fs to 
> the full extent of the volume.  Thanks Robert, for all your help on 
> this.  I certainly do appreciate it.

Well, that's cool that it extended it at least.... Congrats!  :-)

--Rob


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