Unusable hastd in FreeBSD 8.2
trociny at freebsd.org
Wed Jun 8 12:45:06 UTC 2011
On Mon, 6 Jun 2011 16:46:55 +0200 Victor Balada Diaz wrote:
VBD> Hastd in it's current form is not usable on FreeBSD 8.2-RELEASE or in 8-STABLE. You
VBD> can see why in this thread:
VBD> You can see the committed fix in:
VBD> But it's never been MFCd. Is it possible to MFC it to 8-STABLE and maybe
VBD> do an errata notice for RELENG_8_2?
Actually, it was MFCed. In r220151.
Also, I don't think this is an issue that makes hastd unusable in FreeBSD 8.2 :-).
The issue is the following. Before switching the node to primary the failover
(third-party) script is checking if secondary process is still alive (assuming
that in this case the primary on another node is still alive too) and fails if
it is -- some protection against split brain. But before r219721 secondary
might not die automatically when primary host was down.
This can be workarounded. E.g. by removing the check in the script :-). Or
setting net.inet.tcp.keepidle to some small value (e.g. 10 seconds) -- this
should make secondary notice that another end is dead after this interval.
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