Comments on: Realtime File System Replication On FreeBSD

By: Trenton

Trenton — Wed, 17 Mar 2010 01:10:27 +0000

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By: Stacey Rains

Stacey Rains — Tue, 16 Mar 2010 16:53:40 +0000

Interesting post. Thanks for share

By: feby

feby — Tue, 03 Feb 2009 12:39:03 +0000

I have tried this on my servers, however the replication performance is very poor. It takes more than 4 hours to rebuild 160GB of partition over gigabit connection and sometimes I had timeout if someone is trying to write big files.
After I tweak my sysctl into
net.inet.tcp.sendspace=131072
net.inet.tcp.recvspace=262144
kern.ipc.maxsockbuf=1048576
now it takes only half an hour to rebuild 160GB partition and no more timeout. Further information can be found on http://www.geekfarm.org/wu/muse/GeomGate.html

By: Kiwi

Kiwi — Tue, 16 Dec 2008 10:12:03 +0000

Good stuff

But instead of using freevrrpd, you may use CARP since it is integrated by FreeBSD 6+ !

Anyway I like this

By: music

music — Mon, 07 Jan 2008 23:10:12 +0000

very interesting.
i’m adding in RSS Reader

By: golfreeze

golfreeze — Thu, 20 Sep 2007 07:54:35 +0000

Good Job

By: truhan

truhan — Thu, 09 Aug 2007 01:17:41 +0000

I have this in production, too.
Everything works fine, but sometimes geom detects a timeout and it deactivates ggate provider. Then, i have to rebuild (which takes aboute 3 hours for 500G partition).

By: scsi cable

scsi cable — Tue, 26 Jun 2007 13:39:46 +0000

scsi cable…

I found it very useful. Thanks for the knowledge. I am personally trying to follow the advice & try to be independent….

By: Cory

Cory — Tue, 30 Jan 2007 16:01:50 +0000

I have this in production for our CVS server which is also serving Mantics and MediaWiki. Everything works great until someone checks in a 40MB file. That seems to clog the dedicated gigabit ethernet connection and cause some sort of deadlock. At that point I must break the mirror (gmirror deactivate data ggate0) and all works just fine. Then I have to rebuild, which takes about 3-4 hours for the 300G partition that is being replicated.

I have increased the ggate buffers to 8192 (ggatec create -q 8192 10.10.10.x /dev/ar1), but that doesn’t fix the problem.

Maybe I should turn off soft updates ?