I'm confused about how much overhead seems to be involved in creating a
volume group that approaches a terabyte with ECKD devices (A mix of some
3390-27 and mostly 3390-9):
dxxxml01: ~ > df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/sysvg-root
2.0G 460M 1.5G 24% /
/dev/dasda1 109M 34M 71M 33% /boot
tmpfs 1005M 0 1005M 0% /dev/shm
/dev/mapper/sysvg-var
4.0G 210M 3.6G 6% /var
/dev/mapper/sysvg-usr
2.0G 864M 1.1G 46% /usr
/dev/mapper/sysvg-home
3.0G 319M 2.5G 12% /home
/dev/mapper/sysvg-opt
6.9G 359M 6.2G 6% /opt
/dev/mapper/sysvg-tmp
2.0G 68M 1.9G 4% /tmp
/dev/mapper/appvg-lotus
9.9G 151M 9.2G 2% /opt/ibm/lotus
/dev/mapper/appvg-logdir
20G 173M 19G 1% /opt/ibm/lotus/logdir
*/dev/mapper/appvg-notesdata
897G 200M 870G 1% /opt/notesdata *
dxxxml01: ~ > sudo lvdisplay -v /dev/appvg/notesdata
Using logical volume(s) on command line
--- Logical volume ---
LV Name /dev/appvg/notesdata
VG Name appvg
LV UUID ub9Gqh-kAEc-wfxb-lXXi-i9ER-3F9Y-gjyHC2
LV Write Access read/write
LV Status available
# open 1
* LV Size 911.02 GB *
Current LE 233222
Segments 71
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:8
We're going from 911G for the logical volume to 897G displayed in 'df' to
only 870G being available in the filesystem.. That's 41G of 'overhead'.
Am I just naive about how much space it takes to manage this? Any input
welcome!
Scott Rohling
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