Hardware: SATA RAID adapter with SiliconImage 3114 chip. 2 SATA HDD.
I did gmirror.
Run test:
3 parallel tasks "dd if=/dev/mirror/gm0 of=/dev/null bs=1m count=5000"
gstat shows summary read speed from mirror about 30-40 mbyte/sec.
It is for all balance algorithms: load, round-robin, split
While, one "dd if=/dev/ad4 of=/dev/null bs=1m count=5000" shows 50 mbyte/sec
1. Why it occurs and how fix it ?
2. If in the test instead of three instancies of "dd if=/dev/mirror/gm0
of=/dev/null bs=1m count=5000" run only one,
then read speed don`t exceeds read speed from one disk (dd if=/dev/ad4
of=/dev/null bs=1m count=5000)
a) This is gmirror feature ?
b) This is hardware feature (SiliconImage 3114 chip) ?
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