Date: Wed, 04 Mar 1998 13:14:46 -0800 (PST) From: Simon Shapiro <shimon@simon-shapiro.org> To: Wilko Bulte <wilko@yedi.iaf.nl> Cc: grog@lemis.com, hackers@FreeBSD.ORG, blkirk@float.eli.net, jdn@acp.qiv.com, tlambert@primenet.com, sbabkin@dcn.att.com, karl@mcs.net Subject: Re: SCSI Bus redundancy... Message-ID: <XFMail.980304131446.shimon@simon-shapiro.org> In-Reply-To: <199803041919.UAA01618@yedi.iaf.nl>
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On 04-Mar-98 Wilko Bulte wrote: ... > Interestingly enough these benchmarks are mostly run with direct attached > disks, no RAID controller in sight. Assuming enough CPU horsepower > (a AlphaServer 8400 will do just fine with 8x 625Mc CPU will do...) you > do striping on the machine. Lots faster than any RAIDbox. A lot of that has to do with politics. Some years ago i worked (briefly!) for a certiain CPU manufacturer who ran RDBMS menchmarks mainly on certain O/S and certain RDBMS engine (both made by the same vendor, dare I say). One brand of RAID controllers was not used because it had a politically incorrect CPU on board. the other brand of RAID controllers was pushed hard as it had a politiclly correct CPU, but was so buggy, we could never finish formatting the disks. We ended up with another brand of non-RAID controllers which was politically acceptable (they did not use the proper CPU or any CPU at all, but the politically wrong O/S was not getting the inside track to this controller). Yes, a very hot CPU arrangement, with many channels, on a fast I/O bus will deliver carefully configured benchmark very well. It is not necessarily an optimal setup for most of us (utilizing 5% of a disk is not what we normally do either. There ar ebenchmarks, and there is real life. > Who cares about data integrity, it is TPC you want for the glossies. Actually some benchmarks are supposed to consider that. But I could tell you some funny stories there too. ---------- Sincerely Yours, Simon Shapiro Shimon@Simon-Shapiro.ORG Voice: 503.799.2313 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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