Quote:
Originally Posted by
Davinzy
HI Tony,
how can I check how many physical volumes are there ?
From what I remember you run:
# df -k .
in the data volume to determine the logical volume (LV) it is stored in.
# lvdisplay -v lvnn
where lvnn is the name and number of the LV your data is stored in to see what volume group your LV is part of.
# vgdisplay vgnn
where vgnn is the name and number of the volume group (VG).
This will tel you how many Physical Volumes (PVs) your VG is spread over, they could be slices of disks some on the same disk just top confuse matters and the VGs could be divided into several LVs but hopefully your system is using whole disks and the VG is dedicated to the LV your data is stored in!
I hope that helps?
Edit:
I should have said that by the sounds of what you say you do need the volume striped over as many disks as possible to get the best bandwidth and access time for your parallel processing on multiple small files.