rawio – testing device performance
After I installed vinum, I wanted to compare the
performance of the vinum and non-vinum volumes. I was told about
Greg Lehay’s benchmark program, rawio.
From man rawio: rawio tests the
speed of the low-level character I/O device special in a concurrent environment. It is
intended for comparisons of storage devices on a single system, and is not suited for
cross-platform performance testing.
rawio is available from ftp://ftp.lemis.com/pub/rawio.tar.gz
Installing rawio
First I fetched the tarball. The -P specifies passive mode as I am behind a
firewall. I placed this tarball in /usr/ports/benchmarks/rawio and
untar’d it, and installed it
cd /usr/ports/benchmark mkdir rawio fetch -P ftp://ftp.lemis.com/pub/rawio.tar.gz tar xrvf rawio.tar.gzz make make installWARNING – destructive tests
rawio has the potential to delete data from your disks. Do not run it on
volumes which contain precious data unless you have read an understood the man pages
first. In particular, the following tests in this article are destructive. Use
with caution.
running rawio
rawio has the potential to delete data from your disks. Do not run it
on volumes which contain precious data unless you have read an understood the man pages
first. In particular, the following tests in this article are destructive. Use
with caution.
Here are the tests for the single disks.
Do not run these tests on devices which are mounted. It makes more sense to run
these tests on the raw device rather than the
# rawio -a /dev/rda1s1e Random read Sequential read Random write Sequential write ID K/sec /sec K/sec /sec K/sec /sec K/sec /sec anon 874.8 54 2683.1 164 868.0 54 1380.3 84
I'm in the process of redoing these tests with a new set of drives.
# rawio -a -v 1 /dev/rda1s1e Test ID K/sec /sec %User %Sys %Total RR anon 321.4 20 0.1 8.8 8.9 16384 SR anon 5518.8 337 0.9 85.8 86.7 16384 RW anon 403.6 25 0.2 10.7 10.9 16384 SW anon 617.1 38 0.1 16.4 16.5 16384# rawio -a -v 1 /dev/da2s1e Test ID K/sec /sec %User %Sys %Total RR anon 271.0 17 0.1 7.2 7.3 16384 SR anon 5290.5 323 0.9 90.0 90.9 16384 RW anon 514.1 32 0.2 13.1 13.3 16384 SW anon 1454.7 89 0.2 27.8 28.0 16384
Here is the output from the vinum volume I created.
# rawio -a -v 1 /dev/vinum/test Test ID K/sec /sec %User %Sys %Total RR anon 480.8 30 0.2 18.6 18.9 16384 SR anon 5001.7 305 0.9 88.8 89.7 16384 RW anon 478.2 29 0.2 15.4 15.6 16384 SW anon 1244.2 76 0.2 53.6 53.7 16384