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disks = [2, 2, 2, 2, 4] # TB
columns = 3
slab_size = 256

# All sizes in MB

total = [d * 1000000 for d in disks]

print " "*17 + "Disk %i    "*len(disks) % tuple(range(1, len(disks)+1))

print "Total size (MB): " + "%-10s"*len(disks) % tuple(total)

taken = [0]*len(disks)

used_total = 0
space_allocated = 0

full = False

while not full:
  used_pct = [float(a) / float(b) for a, b in zip(taken, total)]

# Find where to allocate this slab
  idxs = []
  for i in range(0, columns):
    idx = used_pct.index(min(used_pct))
    idxs.append(idx)
    if taken[idx] + slab_size > total[idx]:
      full = True
      break
    used_pct[idx] = 1000
    
  # Allocate the slab
  if not full:
    for idx in idxs:
      taken[idx] += slab_size

used_total += (slab_size * (columns - 1))
    space_allocated += (slab_size * columns)
 
print "Space used (MB): " + "%-10s"*len(disks) % tuple(taken)
print "Utilisation (%): " + "%-10s"*len(disks) % tuple(["%0.2f%%" % ((float(a) / float(b)) * 100) for a, b, in zip(taken, total)])
print
print "Total space used for data:            %0.2f%% (%dGB of %dGB)" % (((float(used_total) / float(sum(total))) * 100), used_total / 1000, sum(total) / 1000)
print "Total space used for data and parity: %0.2f%% (%dGB of %dGB)" % (((float(space_allocated) / float(sum(total))) * 100), space_allocated / 1000, sum(total) / 1000)

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Absolute running time: 0.24 sec, cpu time: 0.11 sec, memory peak: 7 Mb, absolute service time: 0.25 sec