Date: Sat, 24 Aug 1996 12:35:46 -0700 From: "Michael L. VanLoon" <michaelv@MindBender.serv.net> To: Joe Greco <jgreco@brasil.moneng.mei.com> Cc: freebsd-isp@freebsd.org, mvanloon@microsoft.com Subject: Re: Anyone using ccd (FreeBSD disk striper) for news Message-ID: <199608241935.MAA05511@MindBender.serv.net> In-Reply-To: Your message of Sat, 24 Aug 96 11:31:26 -0500. <199608241631.LAA28292@brasil.moneng.mei.com>
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>At $60 a controller I say stuff the machine with controllers and spread
>your disks out over them! (On a PCI system that means 3 SCSI controllers,
[...]
>Your drives then obviously get spread out among the busses. Note: I stripe
>_across_ busses because I intuitively believe that this may give me better
>response.
Could you give me an example?
How does this fit your scheme: two AHC2940UW's (I can probably get
these easier than NCR controllers -- cost isn't a significant factor)
with tagged-command-queuing enabled, four drives (2-4GB), two per
controller. If I put a single ccd across all of them, going in the
order 1, 3, 2, 4. Does that sound like a fairly well optimized start?
Or, maybe even three AHC2940UW's with six drives, 1, 4, 7, 2, 5, 8, 3,
6, 9, in a single large ccd.
Once you star getting multiple ccd filesystems in the news spool,
things become much more complicated (keeping things balanced between
different filesystems).
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Michael L. VanLoon michaelv@MindBender.serv.net
--< Free your mind and your machine -- NetBSD free un*x >--
NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3,
Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32...
NetBSD ports in progress: PICA, others...
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