Date: Fri, 7 Apr 1995 01:19:39 -0400 (EDT) From: Sujal Patel <smpatel@wam.umd.edu> To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> Cc: hackers@FreeBSD.org Subject: Re: large filesystems/multiple disks [RAID] Message-ID: <Pine.BSD.3.91.950407011754.145C-100000@xi.dorm.umd.edu> In-Reply-To: <199504070516.WAA06264@gndrsh.aac.dev.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, 6 Apr 1995, Rodney W. Grimes wrote: > Did you have spindle sync on the Quantum drives? This is very important > if you want to eliminate rotational delay problems when muxing the > data out to the drive. You also need to have the interleave data chunk > match closely to the drive cache size (or smaller, but not to small). Unfortuantly, The Quantum drives do not support spindle sync. and also they only have a 96k cache on them too. > Your choice of controllers was poor. I have run 2 drives on a 1742 > doing iozone to both drives at the same time (3+MB/sec each drive) > for a controller throughput of 6MB/sec. > I have run 2 4MB/sec drives on an NCR 825 based controller and got > 7+MB/sec combined throughtput. It's possible that the controller is at fault here. Even though it is a EISA controller, it's very old-- I've had mine for many years. Sujal
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSD.3.91.950407011754.145C-100000>