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pvc-installer
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Modify detect match to 3% 

This will handle corner cases of RAID devices that are a little smaller
than expected (300GB -> 293GB), which were a little outside the 2%
range, while still being close enough.
This commit is contained in:
Joshua Boniface 2021-12-24 15:37:47 -05:00
parent 345b29b84c
commit c0fde2a3bb
1 changed files with 8 additions and 10 deletions
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18
templates/install.sh
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@ -228,17 +228,15 @@ seed_config() {
IFS=: read detect b_name b_size b_id <<<"${target_disk}"
# Get the lsscsi output (exclude NVMe)
lsscsi_data_all="$( lsscsi -s -N )"
# Get the available sizes, and match to within +/- 2%
# Get the available sizes, and match to within +/- 3%
lsscsi_sizes=( $( awk '{ print $NF }' <<<"${lsscsi_data_all}" | sort | uniq ) )
# For each size...
for size in ${lsscsi_sizes[@]}; do
# Get whether we match +2% and -2% sizes to handle human -> real deltas
# Get whether we match +3% and -3% sizes to handle human -> real deltas
# The break below is pretty safe. I can think of no two classes of disks
# where the difference is within 2% of each other. Even the common
# 120GB -> 128GB and 240GB -> 256GB size deltas are well outside of 2%,
# so this should be safe in all cases. 1% would be narrower but has more
# chance of mis-identifying due to rounding, while 3% gets into more
# contentious differences, so 2% seems like the best option.
# where the difference is within 3% of each other. Even the common
# 120GB -> 128GB and 240GB -> 256GB size deltas are well outside of 3%,
# so this should be safe in all cases.
# We use Python for this due to BASH's problematic handling of floating-
# point numbers.
is_match="$(
@ -249,9 +247,9 @@ try:
t_size = float(sub(r'\D.','','${size}'))
except ValueError:
exit(0)
plustwopct = t_size * 1.02
minustwopct = t_size * 0.98
if b_size > minustwopct and b_size < plustwopct:
plusthreepct = t_size * 1.03
minusthreepct = t_size * 0.97
if b_size > minusthreepct and b_size < plusthreepct:
print("match")
EOF
)"