Date: Wed, 6 May 2009 14:29:51 -0400 From: Bill Moran <wmoran@potentialtech.com> To: "Gary Gatten" <Ggatten@waddell.com> Cc: Mueller <om-lists-bsd@omx.ch>, Benjamin Krueger <benjamin@seattlefenix.net>, Olivier, Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>, freebsd-performance@freebsd.org, freebsd-questions@freebsd.org Subject: Re: filesystem: 12h to delete 32GB of data Message-ID: <20090506142951.2a27284d.wmoran@potentialtech.com> In-Reply-To: <70C0964126D66F458E688618E1CD008A0793EBD1@WADPEXV0.waddell.com> References: <1241610888.16418.64.camel@ompc.insign.local> <20090506084834.61600c42.wmoran@potentialtech.com> <alpine.BSF.2.00.0905061734380.32591@wojtek.tensor.gdynia.pl> <4A01C202.8080803@seattlefenix.net> <70C0964126D66F458E688618E1CD008A0793EBD1@WADPEXV0.waddell.com>
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In response to "Gary Gatten" <Ggatten@waddell.com>: > It could just be me, but I swear Hardware RAID has been faster for many > many years, especially with RAID5 arrays - or anything that requires > parity calcs. Most of my benchmarking was done on SCO OpenServer and > Novell UnixWare and Netware, but hardware RAID controllers were always > faster and of course required far less host CPU resources. Raid > 0/1/10/0+1/whatever arrays, I recall weren't as drastic, but I can't > imagine the controller making as big a difference as the drives in the > array - unless of course the drive for said controller sux! Keep in mind that there are a LOT of RAID controllers out there, and yes, some of them suck royally. Especially the consumer-grade stuff intended for people to use on their home systems. I'd be willing to bet that software RAID is faster than 90% of the consumer grade RAID cards, and probably more reliable than most of them as well. Controllers make a huge difference, even in server class RAID (in my experience). There is a significant gap in performance between the good stuff and the good enough stuff. -- Bill Moran http://www.potentialtech.com http://people.collaborativefusion.com/~wmoran/
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