10TB filesystem possible on Red Hat 4 EL System?

[Griffin, Edward]

<snip>

[root at xxx ~]# pvcreate /dev/sdc1

  Physical volume "/dev/sdc1" successfully created

[root at xxx ~]# vgcreate vg0 /dev/sdc1

  Volume group "vg0" successfully created

[root at xxx ~]# vgdisplay

  --- Volume group ---

  VG Name               vg0

  System ID        

  Format                lvm2

  Metadata Areas        1

  Metadata Sequence No  1

  VG Access             read/write

  VG Status             resizable

  MAX LV                0

  Cur LV                0

  Open LV               0

  Max PV                0

  Cur PV                1

  Act PV                1

  VG Size               9.54 TB

  PE Size               4.00 MB

  Total PE              2502079

  Alloc PE / Size       0 / 0

  Free  PE / Size       2502079 / 9.54 TB

  VG UUID               OXokb4-nvoM-dErL-zy1S-8xWc-fiNG-MLy7QL

<snip>

 

Your problem is your Physical Extent Size is only 4.00MB, from the man
page on vgcreate "The default of 4 MB leads to a maximum logical volume
size of around 256GB."  In addition "there is a limit of 65534 extents
in each logical volume."

 

So to get to ~10TB you need at a mininum physical extent size
10008320MB/65534 extents = 152.719MB/extent  so you can tune the size
from 8KB to 16GB so you can find something that works well in your
environment.

 

--Ed

 

*****************************************************************
Ed Griffin
Associate Staff Member
Network/System Administrator
MIT Lincoln Laboratory
Weather Sensing Group
(781) 981-2871
mailto:edg at ll.mit.edu <mailto:edg at ll.mit.edu> 
*****************************************************************

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