Date: Mon, 09 Nov 1998 22:38:04 -0800 From: Mike Smith <mike@smith.net.au> To: hackers@FreeBSD.ORG Subject: [Vinum] Stupid benchmark: newfsstone Message-ID: <199811100638.WAA00637@dingo.cdrom.com>
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Just started playing with Vinum. Gawd Greg, this thing seriously needs a "smart" frontend to do the "simple" things. 4 x 4GB disks (2x Atlas, 2x Grand Prix) on an ncr 53c875, slapped together as a single volume. (you want to mention building filesystems in your manpages somewhere too - the '-v' option is not immediately obvious). 6:36 elapsed to newfs the 16GB volume in concatenated mode. 4:36 to newfs it in striped mode (64b stripes). There was an interesting symptom observed in striped mode, where the disks seemed to have a binarily-weighted access pattern. It will get more interesting when I add two more 9GB drives and four more 4GB units to the volume; especially as I haven't worked out if I can stripe the 9GB units separately and then concatenate their plex with the plex containing the 4GB units; my understanding is that all plexes in a volume contain copies of the same data. Can you nest plexes? Anyway, apart from one incident where I managed to get a pile of debugger calls out of Vinum (freeing already free memory - it occurred after many failed config attempts and I haven't been able to reproduce it) it hasn't let me down yet. Tomorrow I build the world on it. Thanks to Greg and the folks at Cybernet! -- \\ Sometimes you're ahead, \\ Mike Smith \\ sometimes you're behind. \\ mike@smith.net.au \\ The race is long, and in the \\ msmith@freebsd.org \\ end it's only with yourself. \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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