Date: Fri, 27 Sep 1996 12:38:32 +0300 (EET DST) From: mika ruohotie <bsdscsi@shadows.aeon.net> To: asami@FreeBSD.ORG (Satoshi Asami) Cc: freebsd-scsi@FreeBSD.ORG Subject: Re: striping/mirroring? Message-ID: <199609270938.MAA20281@shadows.aeon.net> In-Reply-To: <199609270236.TAA18470@silvia.HIP.Berkeley.EDU> from Satoshi Asami at "Sep 26, 96 07:36:32 pm"
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> * now, what i want to know is which scsi drives would give me the best > * performance/reliability... i've personally thought using barracuda 4lp, > * but i feel a bit sceptic it's reliability... > What performance? Sequential or random? I'm assuming that ga586hx512 performance as getting as high as possible read/write speed to/from hard drives. > is an Intel 430 HX with 512KB of cache, that's as good as it gets as > far as motherboards go. yes, it's gigabyte's board that's tested being the 2nd fastest board on market, only tyan is faster... (http://www.u-net.com/sysdoc) and has the said chipset, and cache. > If you want to maximize sequential access, you'll need about 6 or 7 > disks to stripe across them, you'll get to about 28 MB/s with the > option "I586_FAST_BCOPY". For random access, you'll need more like 30 > drives through the filesystem to max out the motherboard. ok only 28 mb/s? isnt it possible to get more speed? > * would mirror it to one... can i? how, if i can? > That isn't mirroring. ;) but what? > If you have 2N drives, mirroring will make that look like a N-disk > ccd. ??? i meant, that: while striping using 4 or something drives, i would love to be able to mirror whatever i am striping to one disk. just to be safe... and now that i think of it... is it even possible? anyone? i would not mind if that safe copy would not run as fast as the rest of the filesystem, but that i would have atleast some recent version of the system somewhere on _one_ disk... and while thinking more... is it sane? =) > Satoshi mickey -- mika@aeon.net mika ruohotie
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