Date: Fri, 20 Jun 1997 03:37:07 -0700 From: "Jordan K. Hubbard" <jkh@time.cdrom.com> To: dg@root.com Cc: Simon Shapiro <Shimon@i-Connect.Net>, "Justin T. Gibbs" <gibbs@plutotech.com>, FREEBSD-HACKERS <FreeBSD-hackers@FreeBSD.ORG>, FREEBSD-SCSI <FreeBSD-SCSI@FreeBSD.ORG>, Brian Tao <taob@nbc.netcom.ca> Subject: Re: Announcement: New DPT RAID Controller Driver Available Message-ID: <27545.866803027@time.cdrom.com> In-Reply-To: Your message of "Fri, 20 Jun 1997 02:29:50 PDT." <199706200929.CAA12213@implode.root.com>
next in thread | previous in thread | raw e-mail | index | archive | help
> haven't had a single failure in that array since. All of our drives have > fairly well balanced spindles and don't vibrate all that much, and I've never > seen a reported seek failure or noticed any slowness. In my opinion, the all- Erm, I think the difference we're probably seeing with wcarchive is the fact that each drive bay doesn't hold more than 8 drives (most holding far fewer) and is independantly bolted to the rack. That probably provides pretty good vibration isolation, but undoubtedly also at a drive-to-housing cost ratio which would be unacceptable to the truly big RAID builder. I would also be suspicious of the cooling properties of a plastic drive enclosure (it seems like packing it in a mini-Igloo ice chest would be no worse to me ;-), but given a much different racking scenario, say 80 drives in a single free-standing rack, I'm more than willing to believe that vibration becomes a significant problem requiring creative solutions. If it were my fingers signing the P.O. on a true drive-array-from-hell, I'd probably favor the vendor providing the best combination of all-metal construction, air-flow, power supply quality and vibration isolation. Unless, of course, they had something like the AMES wind tunnel providing forced airflow past the drives, then I suppose the plastic sled construction wouldn't really matter much, would it? :-) Jordan
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?27545.866803027>