Date: Thu, 05 Apr 2007 10:58:56 -0400 From: Sven Willenberger <sven@dmv.com> To: freebsd-stable@freebsd.org Subject: ggate + gmirror write performance woes Message-ID: <1175785136.8280.10.camel@lanshark.dmv.com>
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I am trying to set up a HA type system involving two identical boxes and
have gone through the following to set up the systems:
Slave server:
ggated -R 196608 -S 196608
(exporting /dev/amrd1 )
net.inet.tcp.sendspace: 65536
net.inet.tcp.recvspace: 131072
Master server:
ggatec create -u 0 -R 196608 -S 196608 -o rw [slaveip] /dev/amrd1
net.inet.tcp.sendspace: 131072
net.inet.tcp.recvspace: 65536
#gmirror status
Name Status Components
mirror/gm0 COMPLETE amrd1s1
ggate0s1
the two servers are connected to each other via their 2ndary physical
gigE interfaces using cat6 crossover cable. (Netperf shows 890 Mbps at
95% confidence).
softupdates are enable on gm0 (though this does not affect the results).
The results:
/usr/bin/time -h cp testfile64M /data1
28.62s real 0.00s user 0.16s sys
and this is very consistent ... about 3 MB/s over repeated runs
dd if=/dev/zero of=/data1/testfile32M2 bs=32k count=1024
1024+0 records in
1024+0 records out
33554432 bytes transferred in 16.122641 secs (2081199 bytes/sec)
What else can I tune here to make this functional? If I increase
recvspace and sendspace much beyond those numbers, ggated will not start
claiming to not have enough buffer space.
Sven
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