iostat -xzN 5 | grep "^vg\|^Dev" produces output like:
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
vg01-root 0.00 0.00 0.00 0.20 0.00 1.60 8.00 0.00 3.00 3.00 0.06
vg05-vz 0.00 0.00 0.00 0.60 0.00 4.80 8.00 0.01 9.00 9.00 0.54
vg03-vz 0.00 0.00 281.00 128.40 5625.60 1027.20 16.25 42.35 103.54 2.44 99.94
vg02-vz2a 0.00 0.00 28.20 11.40 1416.00 112.00 38.59 0.79 19.84 5.99 23.72
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
vg05-vz 0.00 0.00 0.00 8.60 0.00 7876.80 915.91 0.48 55.70 3.40 2.92
vg03-vz 0.00 0.00 308.20 76.20 10376.00 4433.60 38.53 11.50 30.00 2.60 100.00
vg02-vz2a 0.00 0.00 27.80 24.80 604.80 198.40 15.27 0.49 9.39 4.89 25.72
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
vg05-vz 0.00 0.00 0.00 1.80 0.00 585.60 325.33 0.01 5.78 4.00 0.72
vg03-vz 0.00 0.00 323.20 49.00 9283.20 497.60 26.28 3.48 9.40 2.69 99.98
vg02-vz2a 0.00 0.00 40.20 55.80 2644.80 483.20 32.58 1.14 11.86 4.12 39.58
I'd like this to display like top i.e. clear screen and start from the top on each iteration. I'm thinking if there was a way to pipe this through sed/awk/perl/whatever and every time you get ^Dev push a tput clear.
But how?
Have you considered iotop instead?
That said, it shouldn't be too hard to hurl some rough Perl.
#!/usr/bin/perl
# Adjust options to taste.
open(IOSTAT, "iostat -d 5 |") || die;
$| = 1;
while(<IOSTAT>) {
if (/^Dev/) { system "clear"; print; }
if (/^vg/) { print; }
}