Pete French wrote:
I did some benchmarking, and "load" gives me a bit better performance than
"round-robin" so I've elected to use that. Haven't tried "prefer" as
syncing all the drives backwards and forwards to get the preferences set
seems a bit too much like hard work!
I use this patch for sbin/geom/class/mirror/geom_mirror.c
Change:
md.md_priority = i - 1;
To:
md.md_priority = i - 1 + 100;
This makes the first disk with a priority of 100 instead of 0, which
makes it much easier to use "prefer" properly.
It's frustrating, it is *so* close to being workable with iscsi, and the
performance is very good, but if it is going to keep locking up on
me then I just cant use it that way :-(
After failing many times with iSCSI, I use geom_gate with the following
ggatec options: -t 30 -q 32768 -R 262144 -S 262144 -o rw
It seems to be very reliable and fast, but you have to use "prefer" to
get good performance, I only write across the network and not read.
Load and round-robin lead to slow reads during periods of heavy writes.
Hope that helps,
- Andrew
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