Date: Sat, 31 Dec 1994 23:54:59 -0800 (PST) From: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> To: sef@kithrup.com (Sean Eric Fagan) Cc: hackers@freebsd.org Subject: Re: rdump is slow Message-ID: <199501010754.XAA16921@gndrsh.aac.dev.com> In-Reply-To: <199501010722.XAA24011@kithrup.com> from "Sean Eric Fagan" at Dec 31, 94 11:22:56 pm
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> > Has anybody sat down and tried to figure out why? > > (rdump is taking about six hours to dump <700MBytes across an ethernet; > doing about the same amount, spread over different filesystems, takes about > 30-45 minutes locally, to the same tape drive.) > > It could be due to the ethernet, I suppose, but... I think it unlikely. > > Any comments? First thing I would look at would be I/O blocking sizes, are large blocks being transfered over the ethernet, and are large blocks being written to the tape. The numbers you are seeing are not what I am use to seeing with rdump when I was using it under 1.1 to dump freefall to 4mm DAT tape at cdrom.com, use to get about 250KB/sec or 15MB/minute or 700MB in 46 minutes.... > Sean. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Custom computers for FreeBSD
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