Date: Thu, 23 Sep 2010 07:31:13 -0700 From: Matthew Jacob <mj@feral.com> To: John Baldwin <jhb@FreeBSD.org> Cc: Bruce Cran <bruce@cran.org.uk>, src-committers@FreeBSD.org, svn-src-all@FreeBSD.org, Andriy Gapon <avg@FreeBSD.org>, Gavin Atkinson <gavin@FreeBSD.org>, svn-src-head@FreeBSD.org Subject: Re: svn commit: r212964 - head/sys/kern Message-ID: <4C9B64B1.4090907@feral.com> In-Reply-To: <201009230953.56201.jhb@freebsd.org> References: <201009211507.o8LF7iVv097676@svn.freebsd.org> <4C9A6EE6.5050301@freebsd.org> <20100922222441.00002f27@unknown> <201009230953.56201.jhb@freebsd.org>
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There are a lot of accelerations that can be applied here- so much so that Panasas elected to stick with minidumps rather than go to text dumps, even though there is a fairly hard time limit that a blade can be down before more drastic error recovery mechanisms for the shelf kick in. It turns out that the big issue here was more the savecore time coming back up rather than the time of dumping. > minidumps have made the time issue less of a concern on large-memory systems > (full dumps do indeed take a long time on modern systems). I think textdumps > are just as likely to fail as regular dumps though since they both use the > same code for writing out the dump, they just write different bits to the dump > area. >
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