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<p class=MsoNormal>Hello all.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I recently created an XFS filesystem on an x86_64 CentOS 5.3
system. I used all tools in the repository:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Xfsprogs-2.9.4-1<o:p></o:p></p>
<p class=MsoNormal>Kernel 2.6.18-128.1.10.el5.centos.plus<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>It is a somewhat complex configuration of:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Areca RAID card with 16 1.5TB drives in a RAID 6 with 1
hotspare (100GB volume was created for the OS, the rest was one large volume of
~19TB)<o:p></o:p></p>
<p class=MsoNormal>I used pvcreate /dev/sdb to create a physical volume for LVM
on the 19TB volume.<o:p></o:p></p>
<p class=MsoNormal>I then used vgcreate to create a volume group of 17.64TB<o:p></o:p></p>
<p class=MsoNormal>I used lvcreate to create 5 logical volumes, 4x4TB, and
1x1.5TB<o:p></o:p></p>
<p class=MsoNormal>On top of those logical volumes is drbd (/dev/drbd0-/dev/drbd4)<o:p></o:p></p>
<p class=MsoNormal>On top of the drbd volumes, I created a volume group of
17.50TB (/dev/drbd0-/dev/drbd4)<o:p></o:p></p>
<p class=MsoNormal>I created a logical volume of 17.49TB, upon which was
created an xfs filesystem with no options (mkfs.xfs mkfs.xfs
/dev/Volume1-Rep-Store/Volume1-Replicated -L Replicated)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The resulting filesystem is larger than the underlying
logical volume:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>--- Logical volume ---<o:p></o:p></p>
<p class=MsoNormal> LV Name
/dev/Volume1-Rep-Store/Volume1-Replicated<o:p></o:p></p>
<p class=MsoNormal> VG Name Volume1-Rep-Store<o:p></o:p></p>
<p class=MsoNormal> LV UUID fB0q3f-80Kq-yFuy-NjKl-pmlW-jeiX-uEruWC<o:p></o:p></p>
<p class=MsoNormal> LV Write Access read/write<o:p></o:p></p>
<p class=MsoNormal> LV Status available<o:p></o:p></p>
<p class=MsoNormal> # open 1<o:p></o:p></p>
<p class=MsoNormal> LV Size 17.49 TB<o:p></o:p></p>
<p class=MsoNormal> Current LE 4584899<o:p></o:p></p>
<p class=MsoNormal> Segments 5<o:p></o:p></p>
<p class=MsoNormal> Allocation inherit<o:p></o:p></p>
<p class=MsoNormal> Read ahead sectors auto<o:p></o:p></p>
<p class=MsoNormal> - currently set to 256<o:p></o:p></p>
<p class=MsoNormal> Block device 253:5<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>/dev/mapper/Volume1--Rep--Store-Volume1--Replicated<o:p></o:p></p>
<p class=MsoNormal> 18T 411M 18T 1% /mnt/Volume1<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Why is this, and how can I fix it?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal>Michael<o:p></o:p></p>
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