Date: Mon, 25 Oct 2010 09:49:17 +0100 From: Pete French <petefrench@ticketswitch.com> To: pjd@FreeBSD.org, to.my.trociny@gmail.com Cc: freebsd-stable@freebsd.org Subject: Re: hast vs ggate+gmirror sychrnoisation speed Message-ID: <E1PAIk1-000Bfy-Jb@dilbert.ticketswitch.com> In-Reply-To: <20101022181301.GA2014@garage.freebsd.pl>
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> What speed do you expect? IIRC from my tests, I was able to saturate > 1Gbit link with initial synchronization. Also note, that hast > synchronize only differences, and not the entire thing after crash or > power failure. I should probably have put some numbers in the original email, sorry! I am looking here at an initial syc of the entire mirror, not just the differences. ggate+gmirror gives me about 89 meg/second hast gives me about 44 meg/second The boxes have gigabit connectin between them - not directly cross connected, but they are plugged into the same switch. I have lagg doing LACP on them. But, as the setup is identical network-wise for each box then I don't think it's that. I have this is sysctl.conf kern.ipc.maxsockbuf=1048576 net.inet.tcp.sendspace=131072 net.inet.tcp.recvspace=131072 I will give the recompile with changed contants a try (maybe later today) - do I need to do this at both ends though, as I want to avoid downtime if possible. cheers, -pete.
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