I ran a few quick&dirty performance tests comparing the JMB 363 and Sil
3132
SATA controllers. Both are PCIe-x1 cards costing under $US20. The same
pair of drives was used with both controllers. System was otherwise
idle.
Each test was run at least 3 times and the fastest results were used.
FreeBSD 8.0 amd64
Hitachi 2 TB 7200rpm drives
Sil 3132 siis(4) ada[0-3]
JMB 363 achi(4) ada[45]
read from 1 disk:
dd if=/dev/ada5 bs=1m count=1000 of=/dev/null
jmb363: 128414841 bytes/sec 7.2% faster
than sil 3132
sil3132: 119762153
read from both disks:
dd if=/dev/ada4 bs=1m count=1000 of=/dev/null & dd if=/dev/ada5
bs=1m count=1000 of=/dev/null
jmb363: 193589185 bytes/sec (total) 25.1% faster
than sil 3132
sil3132: 154734047
write to 1 disk:
dd of=/dev/ada4 bs=1m count=1000 if=/dev/zero
jmb363: 122418113 bytes/sec 20.1% faster
than sil 3132
sil3132: 101934754
write to both disks:
dd of=/dev/ada4 bs=1m count=1000 if=/dev/zero & dd of=/dev/ada5
bs=1m count=1000 if=/dev/zero
jmb363: 175237444 bytes/sec (total) 10.1% faster
than sil 3132
sil3132: 159158014
read from 1 disk & write to 1 disk:
dd if=/dev/ada4 bs=1m count=1000 of=/dev/null & dd of=/dev/ada5
bs=1m count=1000 if=/dev/zero
jmb363: 231763096 bytes/sec (total) 16.7% faster
than sil 3132
sil3132: 198604276
In all cases, the jmb363 outperformed the sil3132.
In all cases, using both disks at once results in less than the expected
performance.
The Sil 3132 can write to both drives faster than it can read from both
drives. I would expect reading to be at least as fast as writing.
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